CN112505792B - Salt lake deep brine zone exploration method based on radon gas indication - Google Patents
Salt lake deep brine zone exploration method based on radon gas indication Download PDFInfo
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- 229910052704 radon Inorganic materials 0.000 title claims abstract description 233
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical compound [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 title claims abstract description 230
- 239000012267 brine Substances 0.000 title claims abstract description 109
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000005259 measurement Methods 0.000 claims abstract description 63
- 230000002159 abnormal effect Effects 0.000 claims abstract description 44
- 238000009826 distribution Methods 0.000 claims abstract description 34
- 238000005553 drilling Methods 0.000 claims abstract description 29
- 238000010586 diagram Methods 0.000 claims abstract description 14
- 238000003892 spreading Methods 0.000 claims abstract description 9
- 230000007480 spreading Effects 0.000 claims abstract description 9
- 238000012216 screening Methods 0.000 claims abstract description 6
- 238000011161 development Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 241001131796 Botaurus stellaris Species 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims 1
- 239000011780 sodium chloride Substances 0.000 claims 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052700 potassium Inorganic materials 0.000 abstract description 16
- 239000011591 potassium Substances 0.000 abstract description 16
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 15
- 229910052744 lithium Inorganic materials 0.000 abstract description 15
- 238000005065 mining Methods 0.000 abstract description 4
- 238000007796 conventional method Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 173
- 208000010392 Bone Fractures Diseases 0.000 description 111
- 206010017076 Fracture Diseases 0.000 description 111
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 241000185686 Apocynum venetum Species 0.000 description 5
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 241000722949 Apocynum Species 0.000 description 2
- 101100032908 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RAD7 gene Proteins 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 2
- 229910052705 radium Inorganic materials 0.000 description 2
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 210000004243 sweat Anatomy 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
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- High Energy & Nuclear Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Geophysics And Detection Of Objects (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a method for exploring a salt lake deep brine zone based on radon gas indication, belongs to the technical field of prospecting, and solves the problems of low efficiency and large investment in the conventional method for exploring a salt lake deep brine resource. The exploration method of the invention is based on the distribution range and the spreading characteristics of the tensile fracture zone in the area to be explored, and radon gas profile exploration lines are distributed in a way of being vertical to the trend of the tensile fracture zone; carrying out radon measurement to obtain radon concentration measurement values of all radon measurement points on an exploration line; screening out the measuring points of the radon gas concentration positive abnormal value, and projecting the radon gas concentration positive abnormal value on a tensile fracture zone distribution diagram according to the coordinates of the measuring points; and determining the positions of the measuring points of the positive abnormal values of the radon gas concentration as the exposure positions of the brine fracture zone in the salt lake region on the earth surface, and defining the earth surface exposure boundaries. The method can quickly, accurately and inexpensively identify the deep potassium-rich and/or lithium-rich brine fracture zone and the surface exposure position thereof in the salt lake region, and guide the arrangement of deep potassium-rich and/or lithium-rich brine mining and drilling wells.
Description
Technical Field
The invention relates to the technical field of prospecting, in particular to a method for exploring a water zone in the deep part of a salt lake based on radon gas indication, and particularly relates to a method for exploring a potassium-rich and/or lithium-rich brine zone in the deep part of the salt lake based on radon gas indication.
Background
China's quaternary salt lake reserves abundant strategic resources of potassium, lithium and the like in various countries. The potassium salt is a bulk mineral resource which is in short supply in China, and the production of the potassium fertilizer has an irreplaceable effect in guaranteeing the food safety in China; lithium is the lightest metal in the nature, is widely applied to new energy, new materials, high-end equipment manufacturing and other emerging industries, and is known as the energy metal of the 21 st century.
At present, potassium, lithium and other resources in China are mainly developed and utilized by intercrystalline brine in the shallow part (<100m) of the quaternary salt lake and are concentrated in the Qinghai Cheddar basin and the Xinjiang Apocynum pool. In recent years, with the large-scale development and utilization of the brine resources in the salt lake regions, shallow resources are reduced sharply, and the service life of the shallow brine resources is only 15-20 years to maintain the current production scale. The method is an urgent problem to be solved at present, and can find backup resources, successfully complete strategic resource succession and guarantee the sustainable development of the energy bases.
Research and research show that abundant brine resources are reserved in the Chaaida basin and deep part of the Apocynum salt lake in China and can be used as backup resource guarantee of the energy bases. However, because the deep brine reservoirs have strong heterogeneity and poor water-rich property, the traditional exploration technical means cannot quickly and economically acquire key information such as brine storage positions, and the like, so that obstacles are caused to later exploration and development. Based on long-term potassium salt prospecting practice and theoretical research, different scholars propose deep brine storage modes such as 'water-containing wall potassium formation' and 'steep water collecting gallery brine storage mode', indicate that 'fractured zone water storage' is a main occurrence mode of deep brine mineable resources, and successively obtain the verification of drilling verification and trial mining work of salt lakes such as apocynum venetum and the mohsui.
Therefore, a method for rapidly and economically identifying whether a fractured zone exists in a salt lake region and accurately positioning the surface exposure position of the fractured zone in the salt lake region is urgently needed, and a scientific basis is provided for deep brine exploration and subsequent mining hole group arrangement.
Disclosure of Invention
In view of the analysis, the invention aims to provide a method for exploring a salt lake deep brine zone based on radon gas indication, which is used for solving the problems of low efficiency and large investment of the existing method for exploring salt lake region deep brine resources and can quickly, accurately and low-cost identify deep potassium-rich and/or lithium-rich brine fracture zones and surface exposure positions thereof in a salt lake region.
The purpose of the invention is mainly realized by the following technical scheme:
a method for exploring a salt lake deep brine zone based on radon gas indication comprises the following steps:
the method comprises the following steps: drawing a tensile fracture zone distribution diagram based on the distribution range and the spreading characteristics of the tensile fracture zone in the region to be explored;
step two: laying a radon gas profile exploration line in the direction perpendicular to the tensile fracture zone;
step three: carrying out radon measurement to obtain radon concentration measurement values of all radon measurement points on a radon profile exploration line;
step four: screening out the measuring points of the radon gas concentration positive abnormal value, and projecting the radon gas concentration positive abnormal value on a tensile fracture zone distribution diagram according to the coordinates of the measuring points; and determining the positions of the measuring points of the radon gas concentration positive abnormal values as the exposure positions of the brine fracture zone in the salt lake region on the ground surface, and defining the exposure boundaries of the brine fracture zone on the ground surface.
In a preferred embodiment of the invention, the method for exploring the salt lake deep brine zone based on radon gas indication further comprises the following fifth step: and (4) laying drilling engineering holes according to the exposed boundary of the marked brine fracture zone on the ground surface, and performing deep brine drilling.
In a preferred embodiment of the invention, in the step one, the remote sensing interpretation method is adopted to obtain the remote sensing interpreted fracture zone in the region to be explored so as to determine the distribution range and the spreading characteristics of the tensile fracture zone.
In a preferred embodiment of the invention, the number of the radon gas profile exploration lines is multiple, and radon gas measurement points distributed on two adjacent radon gas profile exploration lines are staggered.
In a preferred embodiment of the invention, if a plurality of tensile fracture zones develop in the area to be explored, a radon gas profile exploration line is vertically arranged in the middle of each tensile fracture zone.
In a preferred embodiment of the present invention, if the tensile fracture zone to be explored has a large extension and multiple trends, the tensile fracture zone is divided into multiple segmented fracture zones according to the trends, the trend turning point of the tensile fracture zone is used as a demarcation point of two adjacent segmented fracture zones, and a exploration line is vertically arranged in the middle of each segmented fracture zone.
In a preferred embodiment of the present invention, the number of radon gas profile exploratory lines is 1.
In a preferred embodiment of the invention, if a tensile fracture zone develops in the area to be surveyed, a radon gas profile survey line is vertically arranged in the middle of the vertical tensile fracture zone.
In a preferred embodiment of the invention, in the second step, radon gas measuring points are arranged on the radon gas profile exploration line at equal intervals.
In the second step of the preferred embodiment of the invention, the radon gas measuring points on the radon gas profile exploration line are arranged at unequal intervals, are perpendicular to and far away from the direction of the remote sensing interpretation fracture zone, and the intervals of the radon gas measuring points are gradually reduced.
In a preferred embodiment of the present invention, in step three, the step of measuring radon gas is as follows:
carrying out GPS coordinate calibration and recording on each radon gas measuring point, and simultaneously extracting air from the radon measuring instrument in the air and purifying for 5 minutes; drilling an air suction hole with the depth of 80cm by using a steel chisel, inserting a sampler connected with a radon measuring instrument into the air suction hole, and treading the periphery of the upper part of the sampler by using soil; and opening the emanometer to measure.
In a preferred embodiment of the invention, the gas taking times of the same radon gas measuring point are 3 times, and the single gas taking time is 5 minutes.
In a preferred embodiment of the invention, the point distance of the radon gas measuring points is 50-100 m.
In a preferred embodiment of the invention, during the radon gas measurement process, if a radon gas high value measuring point is met, encryption measurement is carried out between the radon gas high value measuring point and the previous radon gas measuring point.
In a preferred embodiment of the present invention, the step four of screening out the radon gas concentration positive abnormal value measuring point comprises the following steps: taking the average value of radon concentration measured values of two times after the same radon gas measurement point as the radon gas concentration measured value of the measurement point; determining a background value of radon gas concentration in an exploration area by adopting an average value method; calculating the standard deviation of the background value of the radon gas concentration in the exploration area; taking the sum of the background value of the radon gas concentration and 2-4 times of standard deviation as an abnormal lower limit value of the radon gas concentration measuring value; and (4) measuring the radon gas concentration value which is greater than the abnormal lower limit value as a radon gas concentration positive abnormal value measuring point.
In a preferred embodiment of the invention, in the fourth step, the interval of at least two continuous radon gas concentration positive abnormal value measuring points is used as the exposure interval of the deep fracture zone in the salt lake region, and the positions of the positive abnormal value measuring points at two ends of the radon gas concentration positive abnormal value interval are the exposure positions of the deep brine fracture zone in the salt lake region on the ground surface.
In a preferred embodiment of the invention, in the fourth step, the radon gas concentration positive abnormal value is projected on the tensile fracture zone distribution map according to the coordinates of the measuring points to obtain a radon gas measuring value curve; and determining the positions of the measuring points of the radon gas concentration positive abnormal values on the radon gas measuring value curve as the exposure positions of the brine fracture zone on the ground surface.
In a preferred embodiment of the invention, in the fourth step, the parallel tensile fracture zone trend defines the exposed boundary of the salt lake region deep brine fracture zone on the ground surface.
Compared with the prior art, the invention has at least one of the following beneficial effects:
a) the method for exploring the salt lake deep brine zone based on the radon gas indication utilizes the geochemical characteristics of the radon gas and combines the interpretation result of remote sensing data on a macroscopic geological structure, a radon gas profile exploration line is arranged perpendicular to a remote sensing interpretation fracture zone in a to-be-explored area, the obtained radon gas values of all profiles are projected on a tensile fracture distribution diagram according to measuring point coordinates, and the measuring point position of a positive abnormal value of the radon gas concentration is the position of the salt lake area brine fracture zone on the ground surface, so that the rapid and accurate positioning of the deep potassium/lithium-rich brine zone on the position of the salt lake area ground surface exposure is realized, and the technical support is provided for deep brine exploration and exploitation.
b) The method for exploring the salt lake deep brine zone based on radon gas indication is a brand-new method for detecting the salt lake deep brine resources, has the characteristics of high speed, high efficiency, low cost and the like, is successfully applied to the exploration of the salt lake deep brine resources such as Xinjiang apocynum venetum and Qinghai Marhai at present, and has great scientific significance and practical value.
c) According to the method for exploring the salt lake deep brine zone based on the radon gas indication, the surface exposure position of the deep fracture zone in the salt lake region is revealed according to the radon gas concentration measurement result, the fault tendency and the target exploration layer are combined, the deep brine drilling engineering hole position is determined, and the problems of low exploration efficiency and high exploration cost caused by blind arrangement of the drilling engineering holes are solved.
In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a flow chart illustrating steps of a method for exploring a salt lake deep brine zone based on radon gas indication according to an embodiment of the present invention;
FIG. 2 is an illustrative view of the remote sensing structure of the area to be surveyed in the embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating radon distribution in a region to be surveyed according to an embodiment of the present invention;
FIG. 4 is a schematic view of a radon concentration measurement curve of a region to be surveyed in an embodiment of the present invention;
fig. 5 is a schematic diagram of the layout of the planned drilling holes based on the radon gas concentration measurement curve of the region to be surveyed in the embodiment of the invention.
FIG. 6 is a graph showing the measured radon gas values of a D-D' section of a work area 1 of Apocynum venetum salt lake and the positions of the surface exposures of fracture zones in accordance with an embodiment of the present invention;
FIG. 7 is a graph showing the radon gas measurement value curve of F-F' section of a work area 2 of Apocynum venetum salt lake and the position of the surface exposure of the fracture zone in accordance with an embodiment of the present invention.
Reference numerals:
1-brine fracture zone; 2-remote sensing interpretation of the fracture zone; 3-radon gas profile exploration line; 4-radon gas measurement point; 5-radon gas measurement value curve; 6-exposing the border.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
Example 1
Radon is an intermediate product of decay of radium nuclei, is an inert gas element, and belongs to a typical gas-philic element. In the natural radiation system, the radon isotope is222Rn、220Rn and219rn, wherein222Rn isotope half-life of 3.825d, and220rn and219rn has a short half-life, usually only a few seconds to a few tens of seconds, so radon gas measurement is usually performed on222And Rn. The radon has strong mobility and migration ability.222Rn is widely distributed in rock, soil, air and water, and is easily soluble in water and can be adsorbed on the surface of a solid. Under the conditions of certain pressure difference, temperature difference and gradient difference, radon gas migrates from bottom to top, and different radon gas aggregates are formed underground due to different properties and structural environments of rocks passing through in the migration process. When a fracture exists in the underground, the fracture damages the rock stratum, so that a local section of the rock stratum is changed into an unclosed state from an original closed system state, and the pressure is reduced. Due to poor cementation and opening property of the fracture, a good channel for radon gas to migrate to the ground surface is provided. Radioactive substances such as radon dissolved in water flow from the high pressure region to the low pressure region with the ground waterThe section, namely the structural fracture zone or the fissure, and the other part of radon decayed from radium deposited near the diving surface through the actions of diffusion, convection, suction, gas pressure, pump suction, relay transmission and the like, causes deep radon gas to escape from the ground surface along the fracture, and the concentration of the escaping gas is changed regularly, namely, obvious radon abnormity is displayed on the ground surface above the corresponding structural zone.
The invention discloses a method for exploring a salt lake deep brine zone based on radon gas indication, which utilizes the geochemical characteristics of radon gas and combines remote sensing data and materialized exploration data to interpret the geological structure of a region to be explored, can quickly and economically identify whether a fractured zone exists in the deep part of a salt lake region, can accurately position the exposed position of the brine fractured zone of the salt lake region on the ground surface, and has important significance for exploring a salt lake deep potassium-rich and/or lithium-rich brine zone and the exposed position of the brine zone on the ground surface.
A method for exploring a salt lake deep bittern zone based on radon gas indication is shown in a flow chart of a method in figure 1 and comprises the following steps:
the method comprises the following steps: determining the distribution range and the spreading characteristics of the tensile fracture zone in the region to be explored on the remote sensing structure interpretation graph, and drawing a tensile fracture zone distribution graph based on the distribution range and the spreading characteristics of the tensile fracture zone in the region to be explored.
Acquiring information such as the property, the scale, the macroscopic distribution and the like of a fracture structure of a region to be explored by using remote sensing geological interpretation data; and (3) determining the distribution range of the tensile fracture zone in the region to be surveyed, namely determining the distribution range of the remote sensing interpretation fracture zone 2 in the region to be surveyed by combining regional geological data, thereby obtaining the distribution characteristics of the tensile fracture zone, as shown in figure 1.
Step two: and (3) laying a radon gas profile exploration line 3 in a direction perpendicular to the trend of the tensile fracture zone based on the spreading characteristics of the tensile fracture zone.
As shown in fig. 2, according to the distribution characteristics of the tensile fracture zone, 1 or more parallel radon gas profile exploration lines 3 are arranged in the direction perpendicular to the tensile fracture zone, and radon gas measurement points 4 are arranged along the radon gas profile exploration lines 3.
In a preferred embodiment of this embodiment, the number of the radon gas profile exploration lines 3 is multiple, the line distance between two adjacent radon gas profile exploration lines 3 is 250m, radon gas measurement points 4 are equidistantly arranged on each radon gas profile exploration line 3, and the radon gas measurement points 4 arranged on the two adjacent radon gas profile exploration lines 3 are staggered, that is, the connecting line between the first measurement point on the first radon gas profile exploration line 3 and each measurement point on the second radon gas profile exploration line 3 is not perpendicular to the first radon gas profile exploration line or the second radon gas profile exploration line. Of course, the radon gas measuring points 4 in this embodiment may also be arranged in parallel, that is, the radon gas measuring points 4 at the same position (same serial number) on the plurality of radon gas profile exploration lines 3 are substantially located on the same straight line. Compared with the mode of arranging the radon gas measuring points 4 in parallel, the mode of arranging the radon gas measuring points 4 in a staggered mode is adopted, the more detailed distribution characteristics of the radon gas measuring values in a work area can be obtained by using less radon gas measuring points 4, the workload is greatly reduced, and the exploration cost is reduced.
In a preferred embodiment of this embodiment, the number of the radon gas profile exploration lines 3 is 1, and the specific layout mode is as follows: if a plurality of tensile fracture zones develop in the region to be explored, 1 radon gas profile exploration line 3 is vertically arranged in the middle of each tensile fracture zone; if the trend of the tensile fracture zone to be explored is long in extension length and has multiple trends, the tensile fracture zone is divided into multiple sections according to the trend, each section of the tensile fracture zone is called a segmented fracture zone, the trend of each segmented fracture zone is consistent or approximate, the trend turning part of the tensile fracture zone is used as a demarcation point of two adjacent segmented fracture zones, and then 1 radon gas profile exploration line 3 is vertically arranged at the middle position of each segmented fracture zone. Compared with the traditional mode of arranging a plurality of drilling exploration lines for geological exploration, the exploration method of the embodiment can only arrange 1 radon gas profile exploration line 3, can basically determine the exposure position of the brine fracture zone 1 in the salt lake region on the earth surface, greatly reduces exploration workload, and obviously improves exploration efficiency.
In a preferred embodiment of the embodiment, the point distance of the radon gas measuring points 4 is determined according to an exploration scale, the radon gas measuring points 4 are arranged on the radon gas profile exploration line 3 at equal intervals, and the point distance of the radon gas measuring points 4 is 50-100 m. The construction mode of arranging the radon gas measuring points 4 at equal intervals is adopted, so that the measuring point positions are convenient to count, and convenience is brought to drawing.
In a preferred embodiment of the embodiment, the radon gas measuring points 4 on the radon gas profile exploration line 3 are arranged at unequal intervals, and the radon gas measuring points 4 are arranged in a manner that the distances between the radon gas measuring points 4 are gradually reduced in a direction perpendicular to and away from the remote sensing interpretation fracture zone 2. The arrangement mode considers that cracks at the remote sensing interpretation fracture zone 2 are very developed, a good channel for migration of radon gas to the earth surface is provided, obvious radon abnormity is displayed on the earth surface above a corresponding structural zone, the range of exposure of the remote sensing interpretation fracture zone 2 on the earth surface is wide, the exposure position of the brine fracture zone 1 in the salt lake region to be actually determined on the earth surface is often a certain distance away from the remote sensing interpretation fracture zone 2, therefore, radon gas measuring points 4 are densely distributed from sparse to dense in the direction far away from the remote sensing interpretation fracture zone 2, for example, the radon gas measuring points 4 are gradually transitionally distributed from 100m to 50m in the direction far away from the remote sensing interpretation fracture zone 2, the exposure position of the brine fracture zone 1 in the salt lake region on the earth surface can be rapidly and accurately determined, the workload is reduced, and the working efficiency is improved.
Step three: and (4) carrying out radon measurement based on the laid radon profile exploration line to obtain radon concentration measurement values of all radon measurement points 4 of the exploration line.
And selecting an RAD7 radon measuring instrument produced in America to measure the radon gas at a single point along the distributed section, acquiring the radon gas concentration measuring value of each point, and calibrating the coordinates of each point by using a GPS. Wherein the working environment of the RAD7 radon measuring instrument is-10-40 ℃, and the atmospheric humidity<95 percent, the radon detection range is 0.37-740000 Bq/m3The counting capacity is 1-99999, and the counting error is less than or equal to 10%.
During measurement, firstly, GPS coordinate calibration and recording are carried out on each measuring point, and the radon measuring instrument is used for extracting air from the air and purifying the air for 5 minutes, so that the influence of residual gas in the instrument on current measurement data is avoided; then, a steel chisel is used for cutting an air exhaust hole with the depth of 80cm, then a sampler connected with a radon meter is rapidly inserted into the air exhaust hole, the periphery of the upper part of the sampler is timely treaded by soil, and then a switch of the radon meter is opened for measurement. The gas taking times of the same radon gas measuring point are 3 times, and the single gas taking time is 5 minutes, so that the stable and accurate radon gas content is ensured to be obtained.
In a preferred embodiment of the present invention, the radon gas measuring points are arranged at equal intervals, and the distance between the radon gas measuring points is 50-100 m. In the measurement process, if the high value measurement point of the radon gas concentration measurement value is met, abnormal pursuit is carried out, namely encrypted measurement is carried out between the high value measurement point of the radon gas and the last measurement point, the point distance is reduced to be less than 25m, even the point distance is reduced to 5m-10m until the radon gas concentration measurement values of two adjacent measurement points are the same or similar, and the difference value of the radon gas concentration measurement values of two adjacent measurement points is not more than 10-100 Bq/m3。
Step four: screening out the measuring points of the radon gas concentration abnormal value based on the radon gas concentration measuring values of the radon gas measuring points, projecting the radon gas concentration abnormal value on a tensile fracture zone distribution diagram according to measuring point coordinates, drawing a radon gas measuring value curve 5, determining the measuring point positions of the radon gas concentration abnormal value on the radon gas measuring value curve 5 as the exposure positions of the brine fracture zone 1 in the salt lake region on the ground surface, and drawing the exposure boundary 6 of the brine fracture zone 1 on the ground surface in parallel with the trend of the tensile fracture zone.
And taking the average value of the radon gas concentration measurement values of two times after the same measuring point as the radon gas concentration measurement value of the measuring point. Counting the radon gas concentration measuring value of each measuring point in the exploration area, and determining the background value of the radon gas concentration of the exploration area by adopting an average value method
The background value calculation formula is as follows:
in the formula: x is the number ofiIs the radon concentration measuring value of the ith measuring point, and the unit Bq/L; 1,2,3, … … n; n is the number of measuring points participating in statistics, and n is an integer greater than or equal to 2;
the unit Bq/L is the sum of measured values of the radon gas concentration of each measuring point.
Calculating a standard deviation S of the background value of the radon gas concentration based on the background value of the radon gas concentration in the exploration area, wherein the calculation formula of the standard deviation of the background value of the radon gas concentration is as follows:
background value of radon gas concentration
And the sum of the measured value and the standard deviation S of 2-4 times is used as an abnormal lower limit value Y of the radon gas concentration measured value, and the calculation formula of the abnormal lower limit value is as follows:
and comparing the radon gas concentration measurement value of each measuring point with the abnormal lower limit value, determining the abnormal value when the radon gas concentration measurement value is greater than the abnormal lower limit value, and indicating the exposure position of the brine fracture zone 1 in the salt lake region on the ground surface by the measuring point with the abnormal radon gas concentration value. And (3) according to the recorded measuring point coordinates, putting the radon gas concentration positive abnormal value on the tensile fracture zone distribution diagram, and drawing a radon gas measuring value curve 5 to obtain a radon gas concentration positive abnormal value plane distribution diagram, as shown in fig. 4. The boundary point between the radon gas concentration positive abnormal value measuring point interval and the radon gas concentration low value area is the exposed edge point of the brine fracture zone 1 on the ground surface, and the exposed edge 6 of the brine fracture zone 1 on the ground surface is parallel to the tensile fracture zone.
Furthermore, the interval of at least two continuous radon gas concentration positive abnormal value measuring points is used as the exposure interval of the deep brine fractured zone of the salt lake region, the positions of the positive abnormal value measuring points at two ends of the radon gas concentration positive abnormal value interval are the exposure positions of the deep brine fractured zone 1 of the salt lake region on the ground surface, and the parallel tensile fractured zone trend defines the exposure boundary 6 of the deep brine fractured zone 1 of the salt lake region on the ground surface, as shown in fig. 4.
In this embodiment, when analyzing and processing the radon concentration measurement value at each measurement point of the exploration area, the parameters of the exploration area are partitioned (the exploration area is partitioned) according to the geological conditions, the landscape conditions and other factors, and then the radon concentration measurement values of each measurement point are respectively countedDetermining radon gas concentration measurement value data by adopting an average value method to determine radon gas concentration background value of each measurement region
And calculating the abnormal lower limit value of the radon gas concentration measurement value of each measuring region, and delineating the surface exposure position of the brine fracture zone of each measuring region. If the overall geological conditions and the landscape conditions of the exploration area are the same or similar, whether the influence of the radon gas concentration background value is determined by carrying out the area detection on the exploration area or not is small, the exploration area can be used as the whole, and the radon gas concentration background value of the whole exploration area is determined by adopting an average value method according to the radon gas concentration measurement value data of the whole exploration area
And (3) calculating the abnormal lower limit value of the radon concentration measuring value of the whole surveying area of the surveying area, and defining the exposure position of the brine fracture zone 1 of the surveying area on the ground surface and the exposure boundary 6 of the brine fracture zone 1 on the ground surface.
Compared with the prior art, the method for exploring the salt lake deep brine zone based on radon gas indication is a brand-new method for exploring the salt lake deep brine resource, preliminarily defines the distribution range and the distribution characteristics of a tensile fracture zone in a to-be-explored area based on the characteristics of existing macroscopic structure properties, distribution and the like, can quickly, efficiently and economically identify the fracture zone of the deep potassium/lithium-rich brine in the reservoir by utilizing the geochemical characteristics of radon gas, realizes the accurate positioning of the deep potassium/lithium-rich brine zone at the surface exposure position of the salt lake area and the defining of the exposure boundary of the fracture zone at the surface, and can provide technical support for deep brine exploration and exploitation. The method for exploring the salt lake deep brine zone based on radon gas indication is successfully applied to exploration of deep brine resources in salt lake regions such as Xinjiang apocynum venetum and Qinghai Marhai at present, so that the exploration efficiency is improved, the exploration cost is reduced, and the method has great scientific significance and practical value.
Example 2
In another embodiment of the invention, a method for exploring the salt lake deep brine zone based on radon gas indication is disclosed, wherein drilling engineering holes are arranged after the exposure position of the brine fracture zone 1 in the salt lake region on the ground surface and the exposure boundary 6 of the fracture zone on the ground surface are explored by using the exploration method of the embodiment 1. The exposure boundary 6 of the fracture zone on the ground surface is firstly determined according to the chemical characteristics of radon gas, and then the drilling engineering holes are accurately distributed, so that the exploration efficiency can be greatly improved, and the exploration cost is reduced.
The method for exploring the salt lake deep brine zone based on radon gas indication comprises the following steps:
the method comprises the following steps: drawing a tensile fracture zone distribution diagram based on the distribution range and the spreading characteristics of the tensile fracture zone in the region to be explored;
step two: laying a radon gas profile exploration line 3 in the direction of the vertical tensile fracture zone;
step three: carrying out radon measurement to obtain radon concentration values of all radon measurement points 4 on a radon profile exploration line 3;
step four: screening out the measuring points of the radon gas concentration positive abnormal value, and projecting the radon gas concentration positive abnormal value on a tensile fracture zone distribution diagram according to the coordinates of the measuring points;
determining the measuring point position of the radon gas concentration positive abnormal value as the exposure position of the brine fracture zone 1 in the salt lake region on the ground surface, and defining the exposure boundary 6 of the fracture zone on the ground surface;
step five: and (4) laying drilling engineering holes according to the exposed boundary 6 of the marked brine fracture zone 1 on the ground surface, and performing deep brine drilling.
According to the exposure position of the salt lake region deep brine fractured zone 1 on the ground surface and the exposure boundary 6 (namely the exposure boundary line) of the brine fractured zone 1 on the ground surface, which are disclosed by the radon gas concentration positive abnormal value plane distribution diagram in the embodiment 1, the hole position of the deep brine drilling engineering is accurately determined by combining the fault tendency and the target exploration layer. Specifically, drilling engineering holes are distributed according to the exposure position of the brine fracture zone 1 on the ground surface determined by radon gas measurement and physical exploration data to obtain fault dip angles, exploration target horizon depths, fault characteristic parameters and the like, and deep brine drilling is carried out.
As shown in fig. 5, a fault inclination angle α, an exploration target horizon depth H, fault characteristic parameters and the like are obtained based on physical exploration data, drilling hole sites are distributed on a fault hanging wall, exploration drilling wells are distributed on an exposure boundary line of the earth surface perpendicular to a brine fracture zone 1, the hole site positions of the exploration drilling wells are marked as points a, an intersection point of the points a and the brine fracture zone 1 perpendicular to the exposure boundary line of the earth surface is marked as point B, a straight line where a line segment AB is located is perpendicular to the exposure boundary line of the brine fracture zone 1, the distance between the distribution positions of the exploration drilling wells and the exposure boundary line of the brine fracture zone 1 on the earth surface is L, and L is H × tan α. Wherein α is a fault dip angle, °; h is the depth of the exploration target horizon m; and L is the distance between the exploration drilling well and the exposed boundary line of the brine fracture zone 1 on the ground surface, and m is the distance between the exploration drilling well and the exposed boundary line.
And calculating the resource reserves of the brine in the deep part of the salt lake region based on the exploration data obtained by drilling the brine in the deep part, and providing a basis for the subsequent exploitation of the brine rich in potassium/lithium in the deep part.
Compared with the prior art, the method for exploring the salt lake deep brine zone based on radon gas indication, disclosed by the embodiment, can be used for defining the surface exposure position of the salt lake deep brine fracture zone and the exposure boundary of the brine fracture zone 1 on the surface according to the chemical characteristics of radon gas, combining the fault tendency and the target layer of exploration, realizing the accurate layout of drilling engineering holes, avoiding the problems of low exploration efficiency and high exploration cost caused by the blind layout of the drilling engineering holes, and being capable of quickly positioning the deep exploration drilling engineering and the brine well group in subsequent production development to acquire the brine resources with large water quantity and good water quality, thereby not only improving the exploration efficiency, but also reducing the exploration cost and having important scientific significance and practical value for the exploration of the lake salt zone deep brine resources.
Examples of the applications
Fig. 6 shows a radon measurement curve of a D-D' profile of a work area 1 of a career sweat salt lake and the surface exposure position of a brine fracture zone, wherein the bottom graph is from Google Earth. The method comprises the steps of interpreting a fracture zone 2 based on early-stage remote sensing of a exploration work area 1 of a Carr sweat salt lake, laying a radon gas D-D' profile exploration line perpendicular to the fracture zone, and measuring according to 200m intervals. Based on the plotting of the measurement results, it can be seen that the radon gas value is increased within the range of 6200-8400 m, and has obvious positive abnormality. And determining that the position of the measuring line 7900m is an exposure boundary of the brine fracture zone by combining the terrain of the work area, related geological data and the like (only the exposure boundaries of 1 brine fracture zone are drawn in the figure, and other exposure boundaries are not drawn). According to the boundary of the fracture zone determined by radon gas measurement, and the existing exploration data, deep brine mining well groups are laid, so that brine potassium and lithium resources which are rich in water and can be mined are successfully obtained, and the flow of single-well brine is about 4300m3And d, the average potassium chloride grade w (KCl) of the brine is 1.62 percent, and the average lithium chloride grade w (LiCl) is 2.76g/L, which is the first time to obtain potassium and lithium resources with rich water in the deep part of the area.
FIG. 7 shows a graph of radon measurements of the F-F' profile of a work area 2 of the Carlo salt lake and the surface exposure location of the brine break zone, wherein the bottom graph is from Google Earth. In the work area, the highest value of radon gas measurement is 27505.73Bq/m3(coordinates: X-4113585; Y-31614581) and the lowest value is 825.11Bq/m3(coordinates: X-4114385, Y-31614581) and an average value of 6661.48Bq/m3. From the distribution of radon gas concentration measurement values on an exploration line, relatively high values appear at the boundary part of a fracture zone and the fracture development part of the region.
By adopting the exploration method, the accurate positioning of the deep potassium/lithium-rich bittern zone at the surface exposed position of the salt lake region can be quickly realized, and the exploration cost is greatly reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (4)
1. A method for exploring a salt lake deep brine zone based on radon gas indication is characterized by comprising the following steps:
the method comprises the following steps: drawing a tensile fracture zone distribution diagram based on the distribution range and the spreading characteristics of the tensile fracture zone in the region to be explored;
step two: a radon gas profile exploration line (3) is arranged along the vertical direction of the tensile fracture zone;
step three: carrying out radon measurement to obtain radon concentration values of all radon measurement points (4) on a radon profile exploration line (3);
step four: screening out the measuring points of the radon gas concentration positive abnormal value, and projecting the radon gas concentration positive abnormal value on a tensile fracture zone distribution diagram according to the coordinates of the measuring points;
determining the measuring point position of the radon gas concentration positive abnormal value as the exposure position of the brine fracture zone (1) in the salt lake region on the ground surface, and defining the exposure boundary (6) of the brine fracture zone (1) on the ground surface;
step five: according to the determined exposed boundary (6) of the brine fractured zone (1) on the ground surface, drilling engineering holes are distributed for deep brine drilling;
the distance between the layout position of the drilling engineering hole and an exposure boundary (6) of the brine fractured zone (1) on the earth surface is L, and the calculation formula is as follows: l ═ hxtan α, where α is the fault dip angle, °; h is the depth of the exploration target horizon m;
in the first step, a remote sensing interpretation method is adopted to obtain a remote sensing interpretation fracture zone (2) in a region to be explored so as to determine the distribution range and the spreading characteristics of the tensile fracture zone;
the number of the radon gas profile exploration lines (3) is multiple, and radon gas measurement points distributed on two adjacent radon gas profile exploration lines (3) are arranged in a staggered manner;
in the fourth step, the interval of at least two continuous radon gas concentration positive abnormal value measuring points is used as the exposure interval of the deep brine fractured zone of the salt lake region, and the positions of the positive abnormal value measuring points at two ends of the radon gas concentration positive abnormal value interval are the exposure positions of the deep brine fractured zone (1) of the salt lake region on the ground surface;
in the second step, the radon gas measuring points (4) on the radon gas profile exploration line (3) are arranged at unequal intervals, and are perpendicular to and far away from the direction of the remote sensing interpretation fracture zone (2), and the intervals of the radon gas measuring points (4) are gradually reduced.
2. The method for exploring salt lake deep brine zone based on radon gas indication as claimed in claim 1, wherein if multiple tensile fracture zones develop in the area to be explored, 1 radon gas profile exploration line (3) is vertically arranged in the middle of each tensile fracture zone.
3. The method of radon gas indication-based exploration on deep brine zones in salt lakes, as claimed in claim 1, wherein if the development of the area to be explored is elongated and has multiple trends, the tensile fracture zone is divided into a plurality of segmental fracture zones according to the trend, the trend turning point of the tensile fracture zone is used as the boundary point of two adjacent segmental fracture zones, and 1 exploration line is vertically arranged at the middle position of each segmental fracture zone.
4. The method for exploring saline lake deep bittern zone based on radon gas indication as claimed in claim 1, wherein the radon gas measuring points (4) are 50-100 m apart.
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