CN111208570B - Working parameter optimization method of frequency domain conduction electrical method of single resistivity anomaly - Google Patents
Working parameter optimization method of frequency domain conduction electrical method of single resistivity anomaly Download PDFInfo
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Abstract
A working parameter optimization method for a frequency domain conduction electrical method of a single resistivity anomaly body. The method obtains optimized working parameters such as the range of an exploration area, the point distance, the line distance, the distance between power supply points, the number of the power supply points, the minimum total number of channels of a receiver and the like through a specific formula by analyzing information in the aspects of the terrain grade of the exploration area, the designed exploration depth, the size requirement of an abnormal resistivity body to be explored, the resistivity ratio of the abnormal resistivity body to be explored to surrounding rocks, the exploration time requirement coefficient, the device type of a frequency domain conduction electrical method, the number of channels for simultaneously supplying power to a transmitter and the like. The method can obtain more optimal working parameters of the frequency domain conduction electrical method, so that reliable exploration effects can be obtained in more reasonable time and economic cost, namely, more optimal balance points of the exploration cost and the exploration effects are obtained. The method is suitable for exploration work in an exploration area with few resistivity abnormal bodies and more known information.
Description
Technical Field
The invention relates to a novel optimization method for exploration working parameters of a conduction electrical method in the field of exploration of geophysical.
Background
Currently, the working parameters of frequency domain conducted electrical prospecting methods are generally selected by the prospecting staff on the basis of their respective experience and their own general knowledge of the situation of the prospecting area. Due to the fact that the experience of each exploration worker and the general situation of an exploration area are different in estimation and the like, working parameters in exploration are high in randomness, a unified measuring scale is lacked, and too much or too little exploration workload is easy to design. 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 provides a method for exploring by analyzing the information of the terrain grade of an exploration area, the device type of the frequency domain conduction electrical method, the number of channels for simultaneously supplying power to a transmitter, the designed exploration depth, the size requirement (minimum horizontal length, minimum horizontal width and minimum vertical thickness) of an abnormal body of resistivity to be explored, the resistivity ratio of the abnormal body of resistivity to be explored to surrounding rocks, the exploration time requirement coefficient and the like based on the problems in the selection of the working parameters of the conventional frequency domain conduction electrical method exploration method, obtaining the optimized working parameters of the frequency domain conduction electrical method through a specific formula, such as the exploration area range (the horizontal length and the horizontal width of the exploration area), the horizontal point distance of a measuring point, the horizontal line distance of a measuring line, the horizontal distance of power supply points, the number of the power supply points, the minimum total number of receivers and the like, therefore, the exploration work of the exploration area is completed by more reasonable working parameters and exploration workload. The method can obtain more optimal working parameters of the frequency domain conduction electrical method, so that reliable exploration effects can be obtained in more reasonable time and economic cost, namely, the optimal balance between the exploration cost and the exploration effects is realized.
A working parameter optimization method of a frequency domain conduction electrical method of a single resistivity abnormal body 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 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.
c) 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 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 horizontal length, smallest horizontal width, and smallest vertical thickness of the resistivity anomaly to be explored are all greater than or equal to 1 meter.
d) Collecting the Resistivity of a Resistivity abnormal body to be explored in an exploration area and the Resistivity of surrounding rocks, and calculating the Resistivity ratio (resistance _ ratio, dimensionless) of the Resistivity abnormal body to be explored and the Resistivity of the surrounding rocks, wherein the resistance _ ratio is equal to the ratio of the Resistivity abnormal body to be explored and the Resistivity of the surrounding rocks, the resistance _ ratio is not equal to 1, and the resistance _ ratio is greater than 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 the resistivity of the resistivity abnormal body or the surrounding rock to be explored has a plurality of test results, the average value of the resistivity abnormal body or the resistivity of the surrounding rock to be explored is obtained; if the resistivity of the resistivity abnormal body to be explored has a plurality of test results, the average value of the resistivity abnormal body to be explored is obtained; and if the resistivity of the surrounding rock has a plurality of test results, calculating the average value of the resistivity of the surrounding rock. 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 target body 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 abnormal body to be explored and the surrounding rock have obvious resistivity difference, so that the resistivity abnormal body and the surrounding rock can be obviously distinguished through electrical prospecting work.
e) 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.
f) Collecting the Number of channels (Number _ Transmit, unit is one, Number _ Transmit >0) for simultaneously supplying power to the transmitter of the selected frequency domain conduction electrical method instrument; the number of channels for supplying power to the transmitters simultaneously refers to the number of channels for supplying power to the transmitters of the frequency domain electrical conduction method instruments simultaneously, and the frequency of signals supplied by each channel is different from one another; the receiver of the corresponding frequency domain conduction electrical instrument can simultaneously receive all frequency signals simultaneously supplied by the transmitter; preferably, the transmitter of the frequency domain conducted electrical instrument is capable of transmitting 1 or more single frequency signals simultaneously; the receiver of the frequency domain conduction electrical method instrument can simultaneously receive all signals simultaneously sent by the transmitter; the number of the single frequencies transmitted by the transmitter is the same as the number of the single frequencies received by the receiver; the frequency value that the transmitter can transmit is the same as the frequency value that the receiver can receive. That is, if the transmitter can simultaneously transmit n single-frequency signals, the receiver can also simultaneously receive n single-frequency signals. The instrument can simultaneously send or receive 1 or more electric signals, thereby improving the exploration efficiency, reducing the exploration cost, and meeting the requirements of time and the like of a special exploration area.
g) Determining the TYPE of the electrical prospecting device selected in the prospecting work and assigning a value (ARRAY _ TYPE), wherein the ARRAY _ TYPE of the two-pole device is 3, the ARRAY _ TYPE of the three-pole device is 2, and the ARRAY _ TYPE of the four-pole device is 1; and selecting the type of the electrical prospecting device according to the specific requirements of the prospecting area, and assigning values according to the type of the device.
h) Acquiring working parameters after optimization of a frequency domain conduction electrical 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 application _ Length, the unit is meter, and the application _ 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 a measuring point (Station _ Space which is measured in meters and is greater than 0), the horizontal Line distance of a measuring Line (Line _ Space which is measured in meters and is greater than 0), the horizontal distance of a power Supply point (Supply _ Space which is measured in meters and is greater than 0), the Number of the power Supply points (Supply _ Number which is measured in meters and is greater than 0), the minimum total Number of selected frequency domain conduction electric method receivers (Number _ Measure which is measured in tracks and is greater than 0);
wherein MAX () is a function that finds the maximum of the values; ROUNDUP () is a rounding up function; log10() represents the base-10 logarithm; | | represents an absolute value function;
i) and (3) acquiring the working parameters after the frequency domain conduction electrical method optimization according to the formula (2), developing the frequency domain conduction electrical method exploration work of the exploration area according to the acquired working parameters, acquiring frequency domain conduction electrical method exploration data, and performing data processing and interpretation to obtain an exploration result. 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.
Description of the drawings:
FIG. 1 is a flow chart of a method for optimizing operating parameters of a frequency domain conduction method for a single resistivity anomaly according to the present invention;
the specific implementation mode is as follows:
the present invention will be further described with reference to the following embodiment mode 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 3 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 3, then K is 3;
b) 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 20 meters, the surveying _ depth is 20 meters;
c) 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 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 20 meters, a horizontal Width of at least 10 meters and a vertical thickness of at least 2 meters, then Body _ Length is 20 meters, Body _ Width is 10 meters and Body _ Thick is 2 meters;
d) collecting a Resistivity ratio (Resistivity _ ratio) of a Resistivity abnormal body to be explored to a surrounding rock in an exploration area, wherein the Resistivity _ ratio is equal to the ratio of the Resistivity abnormal body to be explored to the Resistivity of the surrounding rock, the Resistivity _ ratio is not equal to 1, and the Resistivity _ ratio is dimensionless and is greater than 0; assuming that the Resistivity anomaly body to be explored in a certain exploration area selected in the step a) has the Resistivity of 50 Ω · m, the Resistivity of the surrounding rock is 500 Ω · m, and the ratio of the resistivities of the anomaly body and the surrounding rock is 0.1, namely, the low-Resistivity anomaly body relative to the surrounding rock is sought in the exploration area, and the Resistivity _ ratio is 50/500-0.1;
e) 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; assuming that the frequency domain conducted electrical prospecting work of a certain prospecting area selected in the step a) is expected to be completed within 1 day, the Time is 1 day;
f) collecting the Number of channels (Number _ Transmit, unit is one) for supplying power to the transmitter of the selected frequency domain conduction electrical method instrument at the same time; the number of channels for supplying power to the transmitters simultaneously refers to the number of channels for supplying power to the transmitters of the frequency domain electrical conduction method instruments simultaneously, and the frequency of signals supplied by each channel is different from one another; the receiver of the corresponding frequency domain conduction electrical instrument can simultaneously receive all frequency signals simultaneously supplied by the transmitter; preferably, the transmitter of the frequency domain conducted electrical instrument is capable of transmitting 1 or more single frequency signals simultaneously; the receiver of the frequency domain conduction electrical method instrument can simultaneously receive all signals simultaneously sent by the transmitter; the number of the single frequencies transmitted by the transmitter is the same as the number of the single frequencies received by the receiver; the frequency value that the transmitter can transmit is the same as the frequency value that the receiver can receive. Preferably, the Number of channels for simultaneously supplying power to the transmitter of the selected frequency domain conduction electrical method instrument is more than or equal to 1, namely (Number _ Transmit ≧ 1); assuming that the Number of channels simultaneously powered by the transmitter of the frequency domain conduction electrical method instrument selected by the exploration work of the certain exploration area selected in the step a) is 5, the Number _ Transmit is 5; the receiver of the frequency domain conduction electrical instrument can also simultaneously receive 5 signals corresponding to the transmitter.
g) Determining the TYPE of the electrical prospecting device selected in the prospecting work and assigning a value (ARRAY _ TYPE), wherein the ARRAY _ TYPE of the two-pole device is 3, the ARRAY _ TYPE of the three-pole device is 2, and the ARRAY _ TYPE of the four-pole device is 1; assuming that the TYPE of the frequency domain conduction electrical prospecting working device of the certain prospecting area selected in the step a) is a tripolar device, the ARRAY _ TYPE is 2;
h) according to the relevant data of the steps, acquiring the working parameters after the frequency domain conduction electrical method optimization 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 the Exploration _ Length, the unit is meter, and the Exploration _ 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 a measuring point (Station _ Space which is measured in meters and is greater than 0), the horizontal Line distance of a measuring Line (Line _ Space which is measured in meters and is greater than 0), the horizontal distance of a power Supply point (Supply _ Space which is measured in meters and is greater than 0), the Number of the power Supply points (Supply _ Number which is measured in meters and is greater than 0), the minimum total Number of selected frequency domain conduction electric method receivers (Number _ Measure which is measured in tracks and is greater than 0);
namely, if the horizontal length in the 20-meter buried depth range is not less than 20 meters, the horizontal width is not less than 10 meters, and the horizontal thickness is not less than 2 meters of low-resistance abnormal body (resistance _ ratio is 0.1), the exploration range of 60 meters by 60 meters needs to be arranged, the horizontal point distance of the measuring points is 4 meters, the horizontal line distance of the measuring line is 7 meters, the horizontal distance of the power supply points is 6 meters, the number of the power supply points is 86, the number of channels for simultaneously supplying power to the transmitter is 5, the minimum total number of channels of the frequency domain conduction electrical method receiver is 67, and the exploration work can be completed in 1 day;
i) 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 (9)
1. A working parameter optimization method of a frequency domain conduction electrical method of a single resistivity abnormal body comprises the following specific steps:
a) collecting the landform and feature conditions in the exploration area, determining the Terrain grade Tertain _ level of the exploration area, determining a Terrain influence parameter K according to a formula (1),
K＝Terrain_level (1)；
b) collecting exploration depth _ depth designed in an exploration area, wherein the unit is meter, and the exploration depth _ depth is greater than 0;
c) collecting the size requirements of the minimum horizontal Length, the minimum horizontal width and the minimum vertical thickness of a resistivity abnormal Body to be explored in an exploration area, wherein the minimum horizontal Length of the resistivity abnormal Body to be explored is Body _ Length which is measured in meters and is greater 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;
d) collecting the Resistivity of a Resistivity abnormal body to be explored in an exploration area and the Resistivity of surrounding rocks, and calculating the Resistivity ratio of the Resistivity abnormal body to be explored to the Resistivity of the surrounding rocks, wherein the parameter is dimensionless, the Resistivity _ ratio is equal to the ratio of the Resistivity abnormal body to be explored to the Resistivity of the surrounding rocks, the Resistivity _ ratio is not equal to 1, and the Resistivity _ ratio is greater than 0;
e) collecting exploration time requirement coefficients of an exploration area; the exploration Time requirement coefficient refers to the whole field data acquisition Time for completing exploration work, wherein the unit is day, and the Time is more than 0;
f) collecting the Number of channels, namely Number _ Transmit, which is supplied with power by a transmitter of the selected frequency domain conduction electrical method instrument at the same time, wherein the Number _ Transmit is greater than 0; the number of channels for supplying power to the transmitters simultaneously refers to the number of channels for supplying power to the transmitters of the frequency domain electrical conduction method instruments simultaneously, and the frequency of signals supplied by each channel is different from one another; the receiver of the corresponding frequency domain conduction electrical instrument can simultaneously receive all frequency signals simultaneously supplied by the transmitter;
g) determining the TYPE ARRAY _ TYPE of the electrical prospecting device selected in the prospecting work and assigning values, wherein the ARRAY _ TYPE of the dipolar device is 3, the ARRAY _ TYPE of the tripolar device is 2, and the ARRAY _ TYPE of the quadrupolar device is 1;
h) calculating working parameters after the frequency domain conduction electrical method optimization 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 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 power Supply point horizontal distance Supply _ Space is meter, and the unit is meter, and the Supply _ Space is greater than 0; the Number of power Supply points is Supply _ Number, the unit is one, and the Supply _ Number is greater than 0; the minimum total channel Number _ Measure of the selected frequency domain conduction electric method receiver is a channel, and the Number _ Measure is greater than 0;
wherein MAX () is a function that finds the maximum of the values; ROUNDUP () is a rounding up function; log10() represents the base-10 logarithm; | | represents an absolute value function;
i) and (3) acquiring the working parameters after the frequency domain conduction electrical method optimization according to the formula (2), developing the frequency domain conduction electrical method exploration work of the exploration area according to the acquired working parameters, acquiring frequency domain conduction electrical method exploration data, and performing data processing and interpretation to obtain an exploration result.
2. The method of claim 1, wherein the method comprises the steps of: preferably, the Terrain grade Terrain _ level of the exploration area is determined according to a Terrain grade division standard about physical exploration in "geological survey project budget standard" issued by the chinese geological survey office in 10 months 2009.
3. The method of claim 1, wherein the method comprises the steps of: preferably, the exploration depth Prospecting _ depth of the exploration area design is less than or equal to 1000 meters, namely Prospecting _ depth is less than or equal to 1000 meters.
4. The method of claim 1, wherein the method comprises the steps of: preferably, the minimum horizontal length, the minimum horizontal width and the minimum vertical thickness of the resistivity anomaly to be explored are all greater than or equal to 1 meter.
5. The method of claim 1, wherein the method comprises the steps of: 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 the resistivity of the resistivity abnormal body to be explored has a plurality of test results, the average value of the resistivity abnormal body to be explored is obtained; and if the resistivity of the surrounding rock has a plurality of test results, calculating the average value of the resistivity of the surrounding rock.
6. The method of claim 1, wherein the method comprises the steps of: 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.
7. The method of claim 1, wherein the method comprises the steps of: preferably, the exploration time requirement factor is equal to or greater than 0.1 days.
8. The method of claim 1, wherein the method comprises the steps of: preferably, the number of tones that the transmitter of the frequency domain conducted electrical instrument can transmit is the same as the number of tones that the receiver can receive; the frequency value that the transmitter can transmit is the same as the frequency value that the receiver can receive.
9. The method of claim 1, wherein the method comprises the steps of: preferably, the Number of channels for supplying power to the transmitters of the selected frequency domain conduction electrical method instruments at the same time is more than or equal to 1, namely Number _ Transmit is more than or equal to 1; the receiver of the frequency domain conducted electrical instrument can simultaneously receive all signals simultaneously transmitted by the transmitter.
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