CN111221043B - Working parameter optimization method of passive source electric field method - Google Patents
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Abstract
A working parameter optimization method of a passive source electric field method. The method obtains optimized working parameters such as the range of the exploration area, the horizontal point distance of measuring points, the horizontal line distance of measuring lines, the minimum total number of receivers, the frequency range of measurable electric field frequency, the frequency ratio of adjacent frequency and the like through a specific formula by analyzing the information of the terrain grade of the exploration area, the distribution range of abnormal areas in the exploration area, the designed exploration depth, the size requirement (the minimum horizontal length, the minimum horizontal width and the minimum vertical thickness) of a resistivity abnormal body to be explored, the resistivity ratio of the resistivity abnormal body to be explored to surrounding rock, the exploration time requirement coefficient and the like. The method can obtain better working parameters of the passive source electric field method, thereby obtaining reliable exploration effect in more reasonable time and economic cost. The method is suitable for the general investigation work of a passive source electric field method in resistivity exploration.
Description
Technical Field
The invention relates to a new method for optimizing exploration working parameters of a passive source electric field method in the field of exploration of geophysical.
Background
The working parameters of the current passive source electric field method exploration method are generally roughly estimated and selected by exploration workers based on respective experiences and general knowledge of the exploration workers about the situation of an exploration area, and due to the fact that the experience of each exploration worker and the general situation of the exploration area are estimated and the like, the working parameter selection in exploration is high in randomness, a unified measuring scale is lacked, and too much or too little exploration workload of design is easily caused. The problems of workload waste, high exploration cost, low efficiency and the like are easily caused when the exploration workload is excessive; if the exploration workload is too small, the problems that the exploration effect is difficult to meet the exploration target requirement, the exploration target body is lost and the like are easily caused. How to effectively solve the problem of working parameter design of specific exploration work and to be used as a specific guide of actual exploration work becomes necessary.
The invention content is as follows:
the invention is based on the problems existing in the working parameter selection of the conventional passive source electric field method exploration method, and obtains the optimized working parameters of the passive source electric field method, such as the range of the exploration area, the point distance, the line distance, at least the selected total number of the selected passive source electric field method receivers, the frequency range of the measurable electric field frequency of the selected passive source electric field method receivers, the frequency ratio of adjacent frequencies in the measurable electric field frequency range of the selected passive source electric field method receivers and the like, by analyzing the information in the aspects of the terrain grade of the exploration area, the horizontal length and the horizontal width of the distribution range of the abnormal area in the exploration area, the designed exploration depth, the minimum size requirement of the length, the width and the thickness of the abnormal body of the resistivity to be explored, the resistivity difference between the abnormal body of the resistivity to be explored and surrounding rock, the exploration time requirement coefficient and the like. The method can obtain better working parameters of the passive source electric field method, thereby obtaining reliable exploration effect in more reasonable time and economic cost. The method is suitable for the general investigation work of a passive source electric field method in resistivity exploration.
A working parameter optimization method of a passive source electric field method comprises the following specific steps:
a) collecting the conditions of landforms and features in an exploration area, determining the Terrain level (Terrain _ level) of the exploration area, and determining a Terrain influence parameter K according to a formula (1), wherein K is Terrain-level (1); the determination of the terrain grade of the exploration area can be determined by adopting corresponding exploration standards or specifications, such as preferably according to the terrain grade division standard about physical exploration in the geological survey project budget standard issued by the Chinese geological survey office in 10 months 2009.
b) Collecting the Length of the horizontal projection and the width of the horizontal projection of an Abnormal area distribution range in the exploration area (the Length of the horizontal projection of the Abnormal area distribution range is Absormal _ Length, which means the Length of the horizontal projection of an Abnormal area where a resistivity Abnormal body possibly exists, and the unit is meter, and Absormal _ Length is greater than 0; the Width of the horizontal projection of the Abnormal region distribution range is Absormal _ Width, which refers to the Width of the horizontal projection of the Abnormal region where the resistivity Abnormal body can exist, and the unit is meter, and the Absormal _ Width is more than 0);
c) collecting exploration depth (surveying _ depth, unit is meter, surveying _ depth >0) of an exploration area design; i.e., determining how many meters of resistivity anomaly distribution are needed over the survey depth range in the survey area. Preferably, the exploration area is designed to have an exploration depth (exploration _ depth) of 1000 meters or less.
d) Collecting the size requirements of the minimum horizontal Length, the minimum horizontal width and the minimum vertical thickness of the resistivity abnormal Body to be explored in an exploration area (the minimum horizontal Length of the resistivity abnormal Body to be explored is Body _ Length unit which is meter, and Body _ Length is more than 0; the minimum horizontal Width of the resistivity abnormal Body to be explored is Body _ Width, the unit is meter, and the Body _ Width is more than 0; the minimum vertical thickness of the resistivity anomaly to be explored is Body _ Thick, which is measured in meters and is greater than 0; ) (ii) a The resistivity anomaly to be explored means that the smallest large-scale resistivity anomaly is sought in an exploration area; since the resistivity anomaly actually existing in the exploration area is generally irregular and belongs to unknown information, the resistivity anomaly to be searched is assumed to be a regular cuboid, and the minimum size of the length, width and thickness of the cuboid is limited. Preferably, the smallest dimension of the length, width and thickness of the resistivity anomaly to be explored is greater than or equal to 1 meter.
e) Collecting resistivity rho of resistivity abnormal body to be explored in exploration area1Resistivity p with surrounding rock2And calculating the ratio of the two (resistance _ ratio ═ p)1/ρ2Dimensionless), the Resistivity _ ratio is equal to the ratio of the Resistivity of the anomaly to be explored to the Resistivity of the surrounding rock, the Resistivity _ ratio is not equal to 1, and the Resistivity _ ratio is not equal to>0; preferably, the resistivity parameters of the resistivity abnormal body to be explored and the surrounding rock are determined by testing the resistivity of the corresponding specimen; if a plurality of test results exist in the resistivity of the same resistivity abnormal body to be explored, the same resistivity to be explored is obtainedAn average resistivity value of the anomaly; if a plurality of test results exist in the resistivity of the same surrounding rock, the average value of the resistivity of the same surrounding rock is obtained; and if the samples of the corresponding resistivity abnormal bodies and the surrounding rocks cannot be obtained temporarily in the exploration area, estimating the resistivity parameters of the resistivity abnormal bodies and the surrounding rocks in the area by combining the data of the earlier stage of the exploration area and integrating the resistivity parameters of the corresponding lithologic samples in other adjacent areas, and taking the estimated values as corresponding resistivity numerical values. Preferably, the resistivity ratio of the resistivity anomaly to be explored to the surrounding rock meets the condition: the resistance _ ratio is 2 or more or 0.5 or less. Namely, the resistivity difference between the resistivity abnormal body and the surrounding rock is relatively obvious, so that the resistivity abnormal body and the surrounding rock can be relatively obviously distinguished through electrical prospecting work.
f) Collecting exploration time requirement coefficients of an exploration area; the exploration Time requirement coefficient refers to the whole field data acquisition Time requirement (Time, unit is day, Time >0) for completing exploration work; preferably, the exploration time requirement factor is equal to or greater than 0.1 days. Because some exploration areas (such as cities) have strict requirements on exploration efficiency and exploration time, it is desirable to complete related exploration work as soon as possible so as to evaluate resistivity anomaly as soon as possible and minimize interference of exploration work on human activities in the exploration areas.
g) Calculating the working parameters after the passive source electric field method is optimized by adopting a formula (2), wherein the working parameters comprise the horizontal Length and the horizontal width of an Exploration area (the horizontal Length of the Exploration area is expression _ Length, the unit is meter, and the expression _ Length is more than 0; the horizontal Width of the Exploration area is expansion _ Width which is measured in meters and is greater than 0), the horizontal point distance of measuring points (Station _ Space which is measured in meters and is greater than 0), the horizontal Line distance of measuring lines (Line _ Space which is measured in meters and is greater than 0), the minimum total Number of channels (Number _ Measure which is measured in channels and is greater than 0) of the selected passive source electric field method receiver, the Frequency Range (Frequency _ Range) of measurable electric field frequencies of the selected passive source electric field method receiver, and the Frequency Ratio (high Frequency/low Frequency) of adjacent frequencies in the measurable electric field Frequency Range of the selected passive source electric field method receiver (Frequency _ Ratio, Frequency _ Ratio >0, dimensionless);
wherein MAX () is a function that finds the maximum of the values; MIN () is a function to find the minimum value among the values; ROUNDUP () is a rounding up function; log10() represents the base-10 logarithm; | | represents an absolute value function;
h) and (3) acquiring the optimized working parameters of the passive source electric field method according to the formula (2), developing the passive source electric field method exploration work of the exploration area, acquiring the passive source electric field method exploration data, and performing data processing and interpretation to obtain the exploration result. By adopting the optimized working parameters, the method can meet various special requirements of exploration work on an exploration area with more abnormal bodies and less known information, thereby realizing the purpose of obtaining reliable exploration results with lower time, economy and other costs.
Description of the drawings:
FIG. 1 is a flow chart of a method for optimizing operating parameters of a passive source electric field method according to the present invention;
the specific implementation mode is as follows:
the invention is further described with reference to the following detailed description of the invention with reference to fig. 1.
a) Collecting the situations of landform, landform and features in an exploration area, determining the landform level (Tertain _ level) of the exploration area according to a landform level division standard about physical exploration in a geological survey project budget standard issued by the Chinese geological survey bureau in 10 months 2009, and determining a landform influence parameter K, wherein K is Tertain-level (1) according to a formula (1); assuming that the Terrain grade of a certain exploration area is determined to be 1 grade according to the Terrain grade division standard about physical exploration in the geological survey project budget standard issued in 10 months in 2009, namely Terrain _ level is 1, then K is 1;
b) collecting the Length of the horizontal projection and the width of the horizontal projection of an Abnormal area distribution range in the exploration area (the Length of the horizontal projection of the Abnormal area distribution range is Absormal _ Length, which means the Length of the horizontal projection of an Abnormal area where a resistivity Abnormal body possibly exists, and the unit is meter, and Absormal _ Length is greater than 0; the Width of the horizontal projection of the Abnormal region distribution range is Absormal _ Width, which refers to the Width of the horizontal projection of the Abnormal region where the resistivity Abnormal body can exist, and the unit is meter, and the Absormal _ Width is more than 0); assuming that the Length of the horizontal projection of the Abnormal region distribution range in the certain exploration region selected in the step a) is 500 meters, and the Width of the horizontal projection is 300 meters, then the Abnormal _ Length is 500 (meters), and the Abnormal _ Width is 300 (meters);
c) collecting the exploration depth (surveying _ depth, unit is meter) of the exploration area design, and assuming that the exploration depth of a certain exploration area selected in the step a) is limited to 100 meters, the surveying _ depth is 100 meters;
d) collecting the size requirements of the minimum horizontal Length, the minimum horizontal width and the minimum vertical thickness of the resistivity abnormal Body to be explored in an exploration area (the minimum horizontal Length of the resistivity abnormal Body to be explored is Body _ Length unit which is meter, and Body _ Length is more than 0; the minimum horizontal Width of the resistivity abnormal Body to be explored is Body _ Width, the unit is meter, and the Body _ Width is more than 0; the minimum vertical thickness of the resistivity anomaly to be explored is Body _ Thick, which is measured in meters and is greater than 0; ) (ii) a Assuming that a certain exploration area selected in the step a) wants to know resistivity anomaly existing in the exploration area, wherein the resistivity anomaly has a horizontal Length of at least 100 meters, a horizontal Width of at least 50 meters and a vertical thickness of at least 5 meters, then Body _ Length is 100 meters, Body _ Width is 50 meters and Body _ Thick is 5 meters;
e) collecting resistivity rho of resistivity abnormal body to be explored in exploration area1Resistivity p with surrounding rock2And calculating the ratio of the two (resistance _ ratio ═ p)1/ρ2Dimensionless), the Resistivity _ ratio is equal to the ratio of the Resistivity of the anomaly to be explored to the Resistivity of the surrounding rock, the Resistivity _ ratio is not equal to 1, and the Resistivity _ ratio is not equal to>0; supposing that the resistivity of the resistivity abnormal body to be explored rho is obtained through a sample test result by judging and evaluating the underground abnormal body through the resistivity parameter in a certain exploration area selected in the step a)150 Ω · m, resistivity ρ of the surrounding rock2500 Ω · m, i.e. the ratio of the resistivity of the anomalous resistivity volume to be explored to the resistivity of the surrounding rock is0.1, namely the exploration area wants to search for a low-resistance abnormal body relative to surrounding rocks, and the resistance _ ratio is 0.1;
f) collecting exploration time requirement coefficients of an exploration area; the exploration Time requirement coefficient refers to the whole field data acquisition Time requirement (Time, unit is day) for completing the exploration work; assuming that the passive source electric field method exploration work of a certain exploration area selected in the step a) is expected to be completed within 2 days, the Time is 2 days;
g) according to the relevant data of the steps, acquiring the working parameters optimized by the passive source electric field method by adopting a formula (2), wherein the working parameters comprise the horizontal Length and the horizontal width of an Exploration area (the horizontal Length of the Exploration area is expression _ Length, the unit is meter, and the expression _ Length is greater than 0; the horizontal Width of the Exploration area is expansion _ Width which is measured in meters and is greater than 0), the horizontal point distance of measuring points (Station _ Space which is measured in meters and is greater than 0), the horizontal Line distance of measuring lines (Line _ Space which is measured in meters and is greater than 0), the minimum total Number of channels (Number _ Measure which is measured in channels and is greater than 0) of the selected passive source electric field method receiver, the Frequency Range (Frequency _ Range) of measurable electric field frequencies of the selected passive source electric field method receiver, and the Frequency Ratio (high Frequency/low Frequency) of adjacent frequencies in the measurable electric field Frequency Range of the selected passive source electric field method receiver (Frequency _ Ratio, Frequency _ Ratio >0, dimensionless);
(2) (ii) a Substituting the correlation data of the above steps into formula (2), thereby obtaining the following operating parameters:
that is, if the horizontal length of the abnormal area within the range of 100 meters buried depth within the range of 500 meters by 300 meters is not less than 100 meters, the horizontal width is not less than 50 meters, and the low resistance abnormal body (resistance _ ratio) with the horizontal thickness of not less than 5 meters is controlled in the exploration area, the exploration range of 1000 meters by 600 meters, the passive source electric field method exploration work with the point distance of 17 meters and the line distance of 34 meters is required to be arranged, the measurable electric field frequency range of the passive source electric field method receiver is [633.36, 6336800], the frequency ratio of adjacent frequencies within the measurable electric field frequency range of the passive source electric field method receiver is 1.108033, and the number of tracks of the passive source electric field method receiver is 2, so that the work can be completed within 2 days;
h) and according to the obtained working parameters after the frequency domain conduction electrical method optimization, carrying out frequency domain conduction electrical method exploration work of an exploration area, obtaining frequency domain conduction electrical method exploration data, and carrying out data processing and interpretation to obtain exploration results. By adopting the optimized working parameters, various special requirements of an exploration area on the exploration work can be met, and therefore a reliable exploration result can be obtained with lower time, economy and other costs.
The above description is only exemplary of the invention and should not be taken as limiting, since any modifications, equivalents, improvements and the like, which are within the spirit and principle of the invention, are intended to be included therein.
Claims (7)
1. A working parameter optimization method of a passive source electric field method comprises the following specific steps:
a) collecting the conditions of landforms, landforms and features in an exploration area, determining the Terrain level Tertain _ level of the exploration area, and determining a Terrain influence parameter K according to a formula (1), wherein K is Tertain _ level (1);
b) collecting the length of the horizontal projection and the width of the horizontal projection of the abnormal area distribution range in the exploration area; the Length of the horizontal projection of the range of the abnormality distinguishing cloth is Absormal _ Length, which means the Length of the horizontal projection of an Abnormal region in which an electrical Abnormal body possibly exists, and the unit is meter, and Absormal _ Length is greater than O; the Width of the horizontal projection of the distribution range of the Abnormal regions is Absormal _ Width, which refers to the Width of the horizontal projection of the Abnormal regions where electrical Abnormal bodies possibly exist and has the unit of meter, and the Absormal _ Width is more than 0;
c) collecting the exploration depth projecting _ depth designed in an exploration area, wherein the unit is meter, and the projecting _ depth is more than 0;
d) collecting the size requirements of the minimum horizontal length, the minimum horizontal width and the minimum vertical thickness of the resistivity abnormal body to be explored in an exploration area; the minimum horizontal Length of the resistivity abnormal Body to be explored is Body _ Length, the unit is meter, and the Body _ Length is more than 0; the minimum horizontal Width of the resistivity abnormal Body to be explored is Body _ Width, the unit is meter, and the Body _ Width is more than 0; the minimum vertical thickness of the resistivity anomaly to be explored is Body _ Thick, which is measured in meters and is more than 0;
e) collecting resistivity rho of resistivity abnormal body to be explored in exploration area1Resistivity p with surrounding rock2And calculating the ratio of the two to be Resistivity _ ratio rho1/ρ2No dimension; the Resistivity _ ratio is equal to the ratio of the Resistivity anomaly to be explored to the Resistivity of the surrounding rock, the Resistivity _ ratio is not equal to 1, and the Resistivity _ ratio is greater than 0;
f) collecting exploration time requirement coefficients of an exploration area; the exploration Time requirement coefficient refers to the whole field data acquisition Time requirement Time for completing exploration work, and the unit is day, and the Time is more than 0;
g) calculating working parameters including the horizontal length and the horizontal width of the exploration area after the passive source electric field method is optimized by adopting a formula (2); the horizontal Length of the Exploration area is application _ Length, the unit is meter, and the application _ Length is more than 0; the horizontal Width of the Exploration area is application _ Width, the unit is meter, and the application _ Width is more than 0; measuring the horizontal point distance between the points and the Station _ Space, wherein the unit is meter, and the Station _ Space is more than 0; measuring the horizontal Line distance Line _ Space of the Line, wherein the unit is meter, and the Line _ Space is more than 0; the minimum total track Number _ Measure of the selected passive source electric field method receiver is a track, and the Number _ Measure is more than 0; the Frequency Range Frequency _ Range of the measurable electric field Frequency of the selected passive source electric field method receiver; the Frequency Ratio of adjacent frequencies in the measurable electric field Frequency range of the selected passive source electric field method receiver is Frequency _ Ratio, the Frequency _ Ratio is more than 0, and is dimensionless, and the Frequency _ Ratio is the Ratio of high Frequency to low Frequency;
wherein MAX () is a function that finds the maximum of the values; MIN () is a function to find the minimum value among the values; ROUNDUP () is a rounding up function; log10() represents the base-10 logarithm; | | represents an absolute value function;
h) and (3) calculating the optimized working parameters of the passive source electric field method according to the formula (2), developing the passive source electric field method exploration work of the exploration area according to the obtained working parameters, acquiring the passive source electric field method exploration data, and performing data processing and interpretation to obtain the exploration result.
2. The method for optimizing operating parameters of a passive source electric field method according to claim 1, wherein: the Terrain grade Terrain _ level of the exploration area is determined according to the Terrain grade division standard about physical exploration in the geological survey project budget standard issued by the Chinese geological survey office in 10 months 2009.
3. The method for optimizing operating parameters of a passive source electric field method according to claim 1, wherein: the exploration depth projecting _ depth designed in the exploration area is less than or equal to 1000 meters.
4. The method for optimizing operating parameters of a passive source electric field method according to claim 1, wherein: the minimum horizontal length, the minimum horizontal width and the minimum vertical thickness of the resistivity anomaly to be explored are all larger than or equal to 1 meter.
5. The method for optimizing operating parameters of a passive source electric field method according to claim 1, wherein: determining resistivity parameters of the resistivity abnormal body to be explored and the surrounding rock by testing the resistivity of the corresponding specimen; if a plurality of test results exist in the resistivity of the same resistivity abnormal body to be explored, the average value of the resistivity of the same resistivity abnormal body to be explored is obtained; and if the resistivity of the same surrounding rock has a plurality of test results, the average value of the resistivity of the same surrounding rock is obtained.
6. The method for optimizing operating parameters of a passive source electric field method according to claim 1, wherein: the resistivity ratio of the resistivity abnormal body to be explored to the surrounding rock meets the condition: the resistance _ ratio is more than or equal to 2 or less than or equal to 0.5.
7. The method for optimizing operating parameters of a passive source electric field method according to claim 1, wherein: the coefficient required for exploration time is greater than or equal to 0.1 day.
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