CN112922587A - Salt frost position identification method and device - Google Patents
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- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The application provides a method and a device for identifying a salt frost position, wherein a logging porosity and a logging gas saturation are obtained in a logging process, a logging water content degree curve is established according to the logging porosity and the logging gas saturation, and a position corresponding to a point on the logging water content degree curve, where the logging water content degree is larger than a water content degree threshold value, is determined as a position where salt frost is separated out from a reservoir, so that the identification of the separated-out position of the salt frost in the reservoir is realized, the preferable work of a testing oil interval is facilitated, and the accuracy of the scale of the gas reservoir is improved.
Description
Technical Field
The application relates to the technical field of oil and gas exploration and development, in particular to a salt frost position identification method and device.
Background
In the field of petrogeology research, after a core taken out of a reservoir is kept still for a period of time, a layer of crystal like frost is automatically separated out on the surface, and the crystal is called salt frost. The identification of the accurate position of salt frost in the reservoir is significant for the optimization of the test oil interval and the evaluation of the gas reservoir scale.
In the prior art, the reservoir salt bloom is generally considered as a typical characteristic of a water layer, research aiming at the reservoir salt bloom mainly focuses on a characteristic description stage of the salt bloom, and a position identification method of the reservoir salt bloom is not available.
Therefore, a method of identifying the location of salt bloom in a reservoir is needed.
Disclosure of Invention
The application provides a method and a device for identifying a salt frost position, which are used for identifying the position of salt frost in a reservoir.
In a first aspect, the present application provides a method for identifying a salt frost location, including:
in the logging process, logging porosity and logging gas saturation are obtained;
establishing a logging water content degree curve according to the logging porosity and the logging gas saturation;
and determining the position corresponding to the point on the logging water-containing degree curve, at which the logging water-containing degree is greater than the water-containing degree threshold value, as the position of salt frost separated out in the reservoir.
Optionally, the establishing a log water cut curve according to the log porosity and the log gas saturation comprises:
and establishing a logging water content degree curve according to the logging porosity and the logging gas saturation through a formula Z-K phi (1-Sg), wherein Z is the logging water content degree, K is an area correction coefficient, phi is the logging porosity, and Sg is the logging gas saturation.
Optionally, before establishing a log water cut curve according to the log porosity and the log gas saturation by using a formula Z ═ K Φ · (1-Sg), the method further comprises:
and determining the value of K according to the region construction type and the construction position.
Optionally, before determining a position corresponding to a point on the log water content course curve where the log water content degree is greater than the water content degree threshold value as a position of salt frost precipitation in the reservoir, the method further includes:
and determining the water-containing degree threshold value according to the logging curve.
Optionally, the determining the threshold value for the water content of the log comprises:
respectively establishing a first three-phase intersection chart of resistivity, acoustic time difference and porosity, a second three-phase intersection chart of resistivity, porosity and gas saturation, and a third three-phase intersection chart of gas measurement display degree, resistivity and natural gamma ray intensity according to a logging curve;
determining salt frost precipitation areas on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate according to the position of salt frost precipitation of the drilled core;
determining the value range of the logging porosity and logging gas saturation of the salt frost precipitation area;
and determining a water content threshold value of the water content of the logging by a formula Z (K) phi (1-Sg) according to the value range of the logging porosity and logging gas saturation of the precipitated salt frost region.
In a second aspect, the present application provides a device for identifying a salt frost location, comprising:
the acquisition module is used for acquiring the logging porosity and the logging gas saturation in the logging process;
the processing module is used for establishing a logging water content degree curve according to the logging porosity and the logging gas saturation;
and the processing module is also used for determining the position corresponding to the point on the logging water content course curve, at which the logging water content is greater than the water content threshold value, as the position of salt frost separated out in the reservoir.
Optionally, the processing module is specifically configured to:
and establishing a logging water content degree curve according to the logging porosity and the logging gas saturation through a formula Z-K phi (1-Sg), wherein Z is the logging water content degree, K is an area correction coefficient, phi is the logging porosity, and Sg is the logging gas saturation.
Optionally, the processing module is further configured to:
and determining the value of K according to the region construction type and the construction position.
Optionally, the processing module is further configured to:
and determining the water-containing degree threshold value according to the logging curve.
Optionally, the processing module is specifically configured to:
respectively establishing a first three-phase intersection chart of resistivity, acoustic time difference and porosity, a second three-phase intersection chart of resistivity, porosity and gas saturation, and a third three-phase intersection chart of gas measurement display degree, resistivity and natural gamma ray intensity according to a logging curve;
determining salt frost precipitation areas on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate according to the position of salt frost precipitation of the drilled core;
determining the value range of the logging porosity and logging gas saturation of the salt frost precipitation area;
and determining a water content threshold value of the water content of the logging by a formula Z (K) phi (1-Sg) according to the value range of the logging porosity and logging gas saturation of the precipitated salt frost region.
The application provides a method and a device for identifying a salt frost position, wherein a logging porosity and a logging gas saturation are obtained in a logging process, a logging water content degree curve is established according to the logging porosity and the logging gas saturation, and a position corresponding to a point on the logging water content degree curve, where the logging water content degree is larger than a water content degree threshold value, is determined as a position where salt frost is separated out from a reservoir, so that the identification of the separated-out position of the salt frost in the reservoir is realized, the preferable work of a testing oil interval is facilitated, and the accuracy of the scale of the gas reservoir is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings needed to be used in the description of the embodiments or the prior art, and obviously, the drawings in the following description are some embodiments of the present invention, and those skilled in the art can obtain other drawings according to the drawings without inventive labor.
Fig. 1 is a schematic flowchart of a first embodiment of a method for identifying a location of salt frost according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of a second implementation of the method for identifying a salt frost location according to the second embodiment of the present application;
fig. 3 is a schematic flowchart of a third embodiment of a method for identifying a location of salt frost according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a first embodiment of a device for identifying a location of salt frost provided in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In exploration drilling, the identification of oil, gas and water layers is an extremely important geological task. One common method is to judge the oil gas water layer by the comprehensive logging instrument, and the intuitive conventional explanation of comprehensive logging is to explain the oil, gas and water layers according to the percentage of the total hydrocarbon components and the changes of the density, resistivity, temperature and volume of the drilling fluid. The specific explanation is as follows:
gas layer: outlet drilling fluid density decreases, viscosity increases, temperature decreases, resistivity increases, flow increases, volume increases.
Oil layer: outlet drilling fluid density decreases, viscosity increases, temperature increases, resistivity increases, flow increases, volume increases.
Water layer: the outlet drilling fluid has a reduced density, reduced viscosity, increased temperature, increased flow, and reduced resistivity.
Therefore, in the actual logging process of the prior art, when the resistivity of the reservoir suddenly drops, a water layer is considered to be present. The presence of a water layer means that further mining is not possible and is the least desirable phenomenon for geologists to see.
However, in an ultra-deep reservoir with depressed carasu zones buried at more than 6000m in a garage of a Tarim basin, obvious salt frost is seen in a plurality of wells, and well logging and logging evidences indicate that in a background of a water layer, high-yield airflow generally exceeding 20 ten thousand cubic meters is tested and no obvious water layer is seen. The reason for this is that the presence of large amounts of chloride ions in saline reservoirs increases the conductivity and decreases the resistivity, even below that of the water layer, thereby creating an aqueous artifact. Therefore, the identification of the position of the salt frost in the reservoir is of great significance to the optimization of the test oil interval and the accurate implementation of the gas reservoir scale.
The application provides a method and a device for identifying salt frost positions, which can effectively identify the positions of salt frost in a reservoir and play an irreplaceable promoting role in geological exploration, oil gas scale evaluation and oil gas exploitation.
The method for identifying the salt frost position is suitable for the geological background covered with the gypsum rock cover layer on the reservoir.
Fig. 1 is a schematic flowchart of a first embodiment of a method for identifying a location of salt frost provided in an embodiment of the present application. As shown in fig. 1, the method for identifying a salt frost position in this embodiment includes:
s101, in the logging process, logging porosity and logging gas saturation are obtained.
In the logging process, the logging porosity and the logging gas saturation are obtained.
The logging porosity can be obtained by calculating the acoustic time difference or the lithologic density, the unit of the logging porosity is percent, the logging gas saturation can be obtained by calculating the Archie's formula, and the unit of the logging gas saturation is percent.
In the step, each time the logging instrument collects a signal, the identification device of the salt frost position can calculate and obtain a logging porosity value and a logging gas saturation value according to corresponding parameters collected by the logging instrument, and finally a series of logging porosity and logging gas saturation points are obtained.
S102, establishing a logging water content degree curve according to the logging porosity and the logging gas saturation.
After S101, in this step, a well logging water content degree curve is established according to the well logging porosity and the well logging gas saturation obtained in S101.
In the logging process of the logging instrument, a group of corresponding logging porosity and logging gas saturation values can be obtained every time a signal is collected, a logging water content degree value can be obtained according to each group of logging porosity and logging gas saturation values, and when logging is completed, the logging water content degree values are connected together to obtain a logging water content degree curve.
In one possible implementation, a logging water content curve is established according to the logging porosity and the logging gas saturation through a formula Z-K phi (1-Sg), wherein Z is the logging water content, K is a regional correction coefficient, phi is the logging porosity, and Sg is the logging gas saturation.
According to the formula Z-K phi (1-Sg), the logging water content Z is determined by the logging porosity phi, the logging gas saturation Sg and a zone correction coefficient K, wherein the zone correction coefficient K is related to the zone structure type and structure position, and K is a fixed value for the same well, so that the logging water content value is only related to the logging porosity and the logging gas saturation in the same well, the logging water content is directly proportional to the logging porosity and is inversely proportional to the logging gas saturation, namely the logging water content is higher when the logging porosity is higher and the gas saturation is lower in the same position.
It is to be understood that, in this implementation, before performing this step, the method further includes:
and determining the value of K according to the region construction type and the construction position.
Due to the fact that the structure types and the structure positions of different areas are different, the identification precision has certain difference, the value of K needs to be determined, and the water content degree is corrected through K, so that the accuracy of the identification method is improved.
In the embodiment of the present application, the value of K may be determined empirically, or may be determined experimentally, which is not limited by the inventors. Usually, K is in the range of 1. ltoreq. K.ltoreq.3.
Optionally, the zone correction factor K is determined from the slope of the junction map by creating a junction map of the resistivity log and the hydration level curve (K-1).
S103, determining the position corresponding to the point on the log water content degree curve, where the log water content degree is greater than the water content degree threshold value, as the position of salt frost precipitation in the reservoir.
In the step, the position corresponding to the point on the water content curve of the logging, at which the water content is greater than the water content threshold value, is determined as the position of salt frost precipitation in the reservoir.
The water content degree threshold value is a parameter for defining a salt frost precipitation area and a salt frost free area, the area or position where the water content degree of the logging well is greater than the water content degree threshold value is the salt frost precipitation area or position, the area or position where the water content degree of the logging well is less than the water content degree threshold value is the salt frost free area or position, and the area or position where the water content degree of the logging well is equal to the water content degree threshold value can be determined according to actual conditions.
It is understood that, before S101, the method of the embodiment of the present application further includes the following two steps:
(1) determining the salt content in the reservoir.
The reservoir was analyzed for salt by microscopic and abrasive experiments on cores that had been taken downhole.
Wherein the microscopic experiment may include: in the casting body slice experiment and the scanning electron microscope experiment, absolute ethyl alcohol is used as a lubricating and cooling solvent in the sampling, sample preparation and analysis processes, so that certain deviation of the experiment caused by the fact that salt is dissolved in water is avoided, and if crystal forms in regular shapes such as lattice shape, honeycomb shape and the like exist in the experiment result, salt particles exist in the storage layer.
The grinding experiment included: and grinding the core of the cored well, and analyzing the content of the chlorine salt.
And confirming that the reservoir of the sampled core well contains salt if the microscopic experiment and the grinding experiment both indicate that the reservoir contains salt.
(2) The source of the salt within the reservoir is determined.
Through actual sampling core data of drilled wells in the research area, on the basis of absolute ethyl alcohol sampling and chlorine content analysis experiment development, an intersection graph of the altitude and the chlorine content in the research area is established by combining the experiment results, and according to the distribution height of the chlorine content, whether the salt source is top paste salt rock cover layer percolation or bottom water layer characteristic is determined.
Illustratively, if the content of chloride salt decreases with increasing reservoir depth, the salt in the reservoir is from the top, i.e. the reservoir is covered with a soft rock cover; if the content of the chlorine salt is increased, then decreased and then increased along with the increase of the depth of the reservoir, the fault exists in the reservoir, and the salt comes from the top and the side of the fault.
The method is only suitable for the geological background of the overburden gypsum rock, namely the situation that salt lakes are deposited on the reservoir, so that the steps (1) and (2) are necessary experimental preparation before the salt frost position identification is carried out, and the efficiency and the accuracy of the salt frost position identification are improved.
In the embodiment of the application, the logging porosity and the logging gas saturation are obtained in the logging process, a logging water content degree curve is established according to the logging porosity and the logging gas saturation, the position corresponding to the point, on the logging water content degree curve, of which the logging water content degree is larger than the water content degree threshold value is determined as the position of salt frost separated out from the reservoir, the position of salt frost separated out from the rock core can be effectively identified, and the salt-containing area in the reservoir can be effectively identified, so that the preferable work of a test oil interval is facilitated to be developed, and the accuracy of the scale of the solid gas reservoir is improved.
Fig. 2 is a schematic flow chart of a second implementation of the method for identifying a salt frost location provided in the second embodiment of the present application. On the basis of the first embodiment, as shown in fig. 2, before S103, the method of this embodiment further includes:
s201, determining a water-containing degree threshold according to the logging curve.
This step is executed before S103, and the device for identifying the location of salt frost determines the threshold value of the moisture level according to the log.
The logging curve refers to a curve obtained directly or indirectly according to logging data of a logging instrument in a logging process, such as a resistivity curve and a porosity curve, wherein the resistivity curve can be obtained directly from the logging data, and the porosity curve needs to be obtained by simply calculating the related logging data.
It is noted that S201 may be performed before S102, or may be performed after S102, which is not limited by the inventors.
According to the method, on the basis of the first embodiment, the water content threshold value is determined according to the logging curve, and due to the fact that geological environments of different wells are possibly different, when the position of salt frost is identified in each well, the water content threshold value of the logging water content is determined again, and therefore the accuracy of identifying the salt frost precipitation position in the reservoir is improved.
Fig. 3 is a schematic flowchart of a third embodiment of a method for identifying a location of salt frost provided in the embodiment of the present application. On the basis of the second embodiment, as shown in fig. 3, the method S201 of this embodiment includes:
s301, respectively establishing a first three-phase intersection chart of resistivity, acoustic time difference and porosity, a second three-phase intersection chart of resistivity, porosity and gas saturation, and a third three-phase intersection chart of gas measurement display degree, resistivity and natural gamma ray intensity according to the logging curve.
In the step, according to the logging curve, a first three-phase intersection chart of resistivity, acoustic wave time difference and porosity is established, a second three-phase intersection chart of resistivity, porosity and gas saturation is established, and a third three-phase intersection chart of gas measurement display degree, resistivity and natural gamma ray intensity is established.
Logging is generally referred to as geophysical logging. Various logging instruments manufactured by physical principles of electricity, magnetism, sound, heat, nuclear and the like are put into a well through a logging cable, so that the surface electric logging instrument can continuously record various parameters changing along with the depth along a well shaft. Subsurface rock formations such as oil, gas, water, coal, metal deposits, etc. are identified by curves representing such parameters. Conventional well logs have nine: respectively natural gamma, natural potential, well diameter, acoustic moveout, lithologic density, compensated neutrons, deep lateral resistivity, shallow lateral resistivity, micro lateral resistivity.
The resistivity can be obtained by numerical reaction of three curves of deep lateral resistivity, shallow lateral resistivity and micro lateral resistivity; the porosity can be obtained by numerical reaction of three curves of acoustic time difference, lithologic density and compensated neutrons; the gas saturation can be calculated by an Archie formula according to the resistivity and the porosity; the gas logging display degree can be obtained through gas logging.
S302, determining a salt frost precipitation area on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate according to the position of salt frost precipitation of the drilled core.
In the step, a salt frost precipitation area is determined on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate according to the position of salt frost precipitation of the drilled core.
Because the position of the sampling core in which the salt frost is separated out is known, the position of the sampling core in which the salt frost is separated out is found out on the first three-phase intersection chart, the second three-phase intersection chart and the third three-phase intersection chart, and then the area in which the salt frost is separated out can be determined, so that the logging response characteristic of the area in which the salt frost is separated out can be obtained.
S303, determining the value range of the logging porosity and logging gas saturation of the salt frost precipitation area.
In this step, after S302, the value ranges of the logging porosity and the logging gas saturation of the precipitated salt frost region are determined.
And performing probability analysis on the logging response characteristics of the precipitated salt frost region in the S302 to obtain the value range of the logging porosity and the logging gas saturation of the precipitated salt frost region.
And S304, determining a water content threshold value of the water content of the logging according to the logging porosity and the logging gas saturation value range of the precipitated salt frost region by using a formula Z (K) phi (1-Sg).
In the step, according to the value range of the logging porosity and logging gas saturation of the precipitated salt frost region, a water content threshold value of the logging water content is determined through a formula Z-K-phi (1-Sg).
Illustratively, if the regional correction factor is 1, the porosity of the precipitated salt frost region log obtained in S303 is greater than 8%, and the gas saturation is less than 65%, K is 1, Φ is 8%, Sg is 65% and the formula Z is K Φ (1-Sg), and the calculated moisture level threshold is 0.028.
In the embodiment, a first three-phase intersection chart of resistivity, acoustic wave time difference and porosity, a second three-phase intersection chart of resistivity, porosity and gas saturation, and a third three-phase intersection chart of gas measurement display degree, resistivity and natural gamma ray intensity are respectively established according to a logging curve, and salt frost is separated out from a drilled core according to the position of the drilled core, determining salt and frost separating areas on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate, determining the value ranges of the logging porosity and the logging gas saturation of the salt and frost separating areas, determining a water content threshold value of the water content of the logging by a formula Z ═ K Φ (1-Sg) according to the sampling range of the logging porosity and logging gas saturation of the precipitated salt frost region, the accuracy of identifying the location of salt frost may be improved at a particular water cut threshold corresponding to a particular well.
Fig. 4 is a schematic structural diagram of a first embodiment of a device for identifying a location of salt frost provided in the embodiment of the present application. In this embodiment, the method for identifying a salt frost position shown in any one of fig. 1 to 3 may be implemented, and as shown in fig. 4, the identifying device 40 in this embodiment includes:
an acquisition module 41 and a processing module 42.
And the obtaining module 41 is used for obtaining the logging porosity and the logging gas saturation during the logging process.
And the processing module 42 is used for establishing a logging water content degree curve according to the logging porosity and the logging gas saturation.
The processing module 42 is further configured to determine a position corresponding to a point on the log water content curve where the log water content is greater than the water content threshold value as a position where salt frost is precipitated in the reservoir.
In one possible implementation, the processing module 42 is specifically configured to:
and establishing a logging water content degree curve according to the logging porosity and the logging gas saturation by a formula Z (K) phi (1-Sg), wherein Z is the logging water content degree, K is an area correction coefficient, phi is the logging porosity, and Sg is the logging gas saturation.
Optionally, the processing module 42 is further configured to:
and determining the value of K according to the region construction type and the construction position.
In another possible implementation, the processing module 42 is further configured to:
and determining the water-containing degree threshold value according to the logging curve.
Optionally, the processing module 42 is specifically configured to:
respectively establishing a first three-phase intersection chart of resistivity, acoustic time difference and porosity, a second three-phase intersection chart of resistivity, porosity and gas saturation, and a third three-phase intersection chart of gas measurement display degree, resistivity and natural gamma ray intensity according to a logging curve;
determining a salt frost precipitation area on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate according to the position of the salt frost precipitation of the drilled core;
determining the value range of the logging porosity and logging gas saturation of the salt frost precipitation area;
and determining a water content threshold value of the water content of the logging by a formula Z (K) phi (1-Sg) according to the value range of the logging porosity and logging gas saturation of the precipitated salt frost region.
In the embodiment of the application, the recognition device 40 through setting the salt frost position comprises an acquisition module 41 and a processing module 42, the acquisition module 41 is used for acquiring the logging porosity and the logging gas saturation during logging, the processing module 42 is used for establishing a logging water-containing degree curve according to the logging porosity and the logging gas saturation, the processing module 42 is further used for determining the position corresponding to the point on the logging water-containing degree curve where the logging water-containing degree is greater than the water-containing degree threshold value, the position of salt frost precipitation in the reservoir is determined, the position of salt frost precipitation in the rock core can be effectively recognized, and the salt-containing area in the reservoir can be effectively recognized, so that the preferable work of a test oil interval is facilitated, and the accuracy of the scale of the gas reservoir is improved.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for identifying the salt frost position is characterized by comprising the following steps:
in the logging process, logging porosity and logging gas saturation are obtained;
establishing a logging water content degree curve according to the logging porosity and the logging gas saturation;
and determining the position corresponding to the point on the logging water-containing degree curve, at which the logging water-containing degree is greater than the water-containing degree threshold value, as the position of salt frost separated out in the reservoir.
2. The method of claim 1, wherein establishing a well log water cut curve based on the well log porosity and the well log gas saturation comprises:
and establishing a logging water content degree curve according to the logging porosity and the logging gas saturation through a formula Z-K phi (1-Sg), wherein Z is the logging water content degree, K is an area correction coefficient, phi is the logging porosity, and Sg is the logging gas saturation.
3. The method of claim 2, wherein prior to establishing a log water cut curve from the log porosity and the log gas saturation using the formula Z K Φ (1-Sg), the method further comprises:
and determining the value of K according to the region construction type and the construction position.
4. The method of any one of claims 1-3, wherein prior to determining a location on the log water cut profile corresponding to a point where the log water cut is greater than the water cut threshold as a location of salt frost precipitation within the reservoir, the method further comprises:
and determining the water-containing degree threshold value according to the logging curve.
5. The method of claim 4, wherein the determining the hydration level threshold from the well log comprises:
respectively establishing a first three-phase intersection chart of resistivity, acoustic time difference and porosity, a second three-phase intersection chart of resistivity, porosity and gas saturation, and a third three-phase intersection chart of gas measurement display degree, resistivity and natural gamma ray intensity according to a logging curve;
determining salt frost precipitation areas on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate according to the position of salt frost precipitation of the drilled core;
determining the value range of the logging porosity and logging gas saturation of the salt frost precipitation area;
and determining a water content threshold value of the water content of the logging by a formula Z (K) phi (1-Sg) according to the value range of the logging porosity and logging gas saturation of the precipitated salt frost region.
6. A device for identifying the location of salt frost, comprising:
the acquisition module is used for acquiring the logging porosity and the logging gas saturation in the logging process;
the processing module is used for establishing a logging water content degree curve according to the logging porosity and the logging gas saturation;
and the processing module is also used for determining the position corresponding to the point on the logging water content course curve, at which the logging water content is greater than the water content threshold value, as the position of salt frost separated out in the reservoir.
7. The apparatus of claim 6, wherein the processing module is specifically configured to:
and establishing a logging water content degree curve according to the logging porosity and the logging gas saturation through a formula Z-K phi (1-Sg), wherein Z is the logging water content degree, K is an area correction coefficient, phi is the logging porosity, and Sg is the logging gas saturation.
8. The apparatus of claim 7, wherein the processing module is further configured to:
and determining the value of K according to the region construction type and the construction position.
9. The apparatus of any of claims 6-8, wherein the processing module is further configured to:
and determining the water-containing degree threshold value according to the logging curve.
10. The apparatus of claim 9, wherein the processing module is specifically configured to:
respectively establishing a first three-phase intersection chart of resistivity, acoustic time difference and porosity, a second three-phase intersection chart of resistivity, porosity and gas saturation, and a third three-phase intersection chart of gas measurement display degree, resistivity and natural gamma ray intensity according to a logging curve;
determining salt frost precipitation areas on the first three-phase intersection plate, the second three-phase intersection plate and the third three-phase intersection plate according to the position of salt frost precipitation of the drilled core;
determining the value range of the logging porosity and logging gas saturation of the salt frost precipitation area;
and determining a water content threshold value of the water content of the logging by a formula Z (K) phi (1-Sg) according to the value range of the logging porosity and logging gas saturation of the precipitated salt frost region.
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| US20120109603A1 (en) * | 2009-06-22 | 2012-05-03 | Ning Li | Quantitative calculation method for oil (gas) saturation of fractured reservoir |
| CN103867198A (en) * | 2014-04-04 | 2014-06-18 | 中国石油集团川庆钻探工程有限公司 | Carbonate rock natural gas layer stratum density discrimination method |
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