CN102879828A - Audio magnetotelluric optimized collection method - Google Patents
Audio magnetotelluric optimized collection method Download PDFInfo
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- CN102879828A CN102879828A CN2012103837714A CN201210383771A CN102879828A CN 102879828 A CN102879828 A CN 102879828A CN 2012103837714 A CN2012103837714 A CN 2012103837714A CN 201210383771 A CN201210383771 A CN 201210383771A CN 102879828 A CN102879828 A CN 102879828A
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Abstract
The invention belongs to the field of geophysical exploration and particularly relates to an audio magnetotelluric optimized collection method. The method comprises field layout of a collection system, data collection and data processing, wherein a data collection method comprises that data are collected in such a method that six times of superposition and five times of collection are conducted for each time at the same measuring point, so that five groups of data can be obtained at one measuring point, and the number of total superposition times is 30 actually; and the data processing comprises the steps of firstly, conducting ROBUST conversion on five groups of data at every measuring point respectively, and then adding and averaging the five groups of data, so that the five groups of data are merged into one group of data. Data are collected according to a data collection and preprocessing method of an EH4 electromagnetic sounding system, and the data quality is greatly improved under the condition that the collection time is not prolonged greatly.
Description
Technical field
The invention belongs to the geophysical survey field, relate to the improvement of audio magnetotelluric method acquisition method, be specifically related to a kind of audio magnetotelluric method and optimize acquisition method.
Background technology
Magnetotelluric method (MT) is a kind of method of geophysics electrical method exploration, it gathers the Natural electromagnetic field signal, frequency range is 500-0.0001 Hz, and corresponding depth of exploration is mainly used in study of gcotectonies and deep petroleum prospecting from hundreds of rice-tens km.When 10000-1Hz is accomplished in the frequency response of instrument, because its main frequency range is suitable with audiorange, therefore be referred to as audio-frequency magnetotelluric magnetic method (AMT).Its depth of exploration relatively is applicable to the prospecting of middle infrastructure from tens meters-several kms.Natural electromagnetic field near electromagnetic field signal 10000-1000Hz and the 1Hz a little less than, whole frequency response section easily is subject to human noise and disturbs, and the data acquisition quality of audio-frequency magnetotelluric magnetic method is greatly reduced, and is unfavorable for the application of the method.In order to overcome the deficiency of audio-frequency magnetotelluric magnetic method, people have adopted artificial source's signal, the electromagnetic wave signal of emission 10000-1Hz, suppress and disturb the Natural electromagnetic field signal, to improve the signal to noise ratio (S/N ratio) of data, controllable source audio-frequency magnetotelluric magnetic method (CSAMT) that Here it is, controllable source audio-frequency magnetotelluric magnetic method data easily are subject to the field source impact.
The controllable source audio-frequency magnetotelluric magnetic method equipment that uses in producing at present mainly is the EH4 imaging system of successive conductance rate of U.S. Geometrics company and EMI company joint research and development, the V series Magnetotelluric System of Canadian phoenix geophysics company, the GDP series electromagnetic system of U.S. ZONGE company.
The present invention is directed to the raising of EH4 imaging system of successive conductance rate image data quality.
The EH4 imaging system of successive conductance rate is by a kind of mixing source frequency domain electromagnetic sounding system in the Joint Production nineties in 20th century of U.S. Geometrics company and EMI company.It combines the part advantage of CSAMT and AMT, utilizes the deficiency of some frequency range of compensation natural signals that manually transmits, to obtain high-resolution resistivity imaging.Its core is still passive source electromagnetic method, and initiatively the manual signal source investigation depth of emission is very shallow, is used for surveying shallow structure; Infrastructure is by natural background field source imaging (AMT).Its information source of EH4 system is 10Hz-100000Hz, and front end is higher than order of magnitude of other electromagnetic sounding systems, and the exploration resolution of superficial part is improved greatly, and is significant in the engineering investigation.
The EH4 system is when using the artificial source, because the transmitting-receiving distance is nearer, effectively the receiving area is less, and emission coefficient and receiving system need synchronizing moving, and production efficiency is extremely low; Even use the artificial source, also be easy to enter the near field region, particularly in the high resistant area, artificial emissive source can't use substantially.So, in actual production, seldom use artificial emissive source, substantially all be to measure natural field signal.
With respect to other electromagnetic sounding systems, the most obvious weakness of EH4 system is poor anti jamming capability, very easily being subject to human noise in the work disturbs, all be difficult to collect superior in quality data to such an extent as to survey the district at great majority, the later stage data is processed explained that difficulty increases greatly, even data reliability also greatly reduces.
The present invention is directed to EH4 system rejection to disturbance ability, the situation that the data of collection are poor than other electromagnetic sounding mass of system has been invented new collection and the preprocess method of a cover, thereby has been realized the purpose that the quality of data improves greatly.
Summary of the invention
The object of the invention is to provide a kind of audio magnetotelluric method to optimize acquisition method, to improve EH4 electromagnetic sounding system data acquisition quality.
The technical scheme that realization the object of the invention is taked is as follows: a kind of audio magnetotelluric method is optimized acquisition method, comprises open-air lay acquisition system, data acquisition and data processing, and concrete steps are as follows:
(1) the open-air acquisition system of laying
During EH4 electromagnetic sounding system field work, generally press X, Y-direction is arranged four measuring electrode and a ground-electrode, and two magnetic probes of corresponding layout are measured respectively electric field signal Ex, Ey and field signal Hx, the Hy of both direction;
(2) data acquisition
Survey the district for every one, at first in EH4 electromagnetic sounding system, create a new working directory, then move the IMAGEM program, trap frequency, initial period, X and the running parameters such as Y-direction spread of electrodes and low frequency drainage pattern are set;
Before each measuring point begins image data, the setting that gains first, the gain set-up mode is automatic gain setting or manual gain setting; Data acquisition is record measuring point information, measurement parameter and record measurement data, and data acquisition is finished by recording these processes;
Each data acquisition is comprised of one or more time time serieses in a special frequency band; After in the end a time series was measured and finished, the data that gather in each process were stored in the time series file, and through processing, all were stored as " stack " cross-power spectrum result of accumulative total for all records; After finishing, each gatherer process will show each " stack " resulting impedance results; Data acquisition modes is on same measuring point, gathers 5 times mode image data 6 times by each stack, and such measuring point just has 5 groups of data, and in fact total stacking fold is 30 times;
(3) data are processed
Carrying out data by following program processes: at first 5 groups of data of each measuring point are carried out respectively the ROBUST conversion; Then 5 groups of data additions are average, such 5 groups of data just have been merged into one group of data.
The ROBUST method is a kind of weighted least-squares method with the observational error size control quality of data, and his great attention to whole data give flying spot with little power, make it reduce its impact in next iteration; The compacting of ROBUST transfer pair non-Gaussian noise is more effective.
To improve the quality of data in order suppressing to disturb, to adopt the repeatedly data acquisition modes of stack, adopt 30 stacks more in the prior art actual production; But stack is only effective to random disturbance, and the interference of non-Gaussian distribution there is not effect substantially.We find in actual production repeatedly, have not in most cases had much effects greater than continuing the improvement of stack to the data quality for about 15 times when stacking fold again.
The present invention changes data acquisition modes, on same measuring point, gathers 5 times mode image data 6 times by each stack, and such measuring point just has 5 groups of data, in fact total stacking fold or 30 times, and the acquisition time of each measuring point is slightly growth just.The present invention has carried out pre-service to data in data acquisition.The present invention only superposes 6 times to the each data that gather of same measuring point, thereby has compressed unnecessary stacking fold, and same measuring point gathers 5 secondary data, such measuring point just has 5 groups of data, increase the data volume of subsequent treatment, by these data are processed, obviously improved the quality of data.
Facts have proved that the present invention has beneficial effect: the EH4 electromagnetic sounding system data of the application of the invention gathers and the preprocess method image data, in the situation that not obvious increase acquisition time, the quality of data obviously improves.In fact by the classic method image data, even it is also of no avail to improving the quality of data to increase acquisition time.
Description of drawings
Fig. 1 is the data that the S3 measuring point collects by 30 stacks of existing acquisition mode;
Fig. 2 is that the S3 measuring point uses the each stack of the present invention to gather the data that obtain after 5 processing for 6 times;
Fig. 3 is the data that the S6 measuring point collects by 30 stacks of existing acquisition mode;
Fig. 4 is that the S6 measuring point uses the each stack of the present invention to gather the data that obtain after 5 processing for 6 times;
Fig. 5 is the data that the S11 measuring point collects by 30 stacks of existing acquisition mode;
Fig. 6 is that the S11 measuring point uses the each stack of the present invention to gather the data that obtain after 5 processing for 6 times;
Fig. 7 is the open-air schematic diagram of arranging of EH4 system.
Among Fig. 1 to Fig. 6: every width of cloth accompanying drawing top is resistivity curve, and transverse axis represents the time, and unit second, the longitudinal axis represents resistivity value, the unit ohm meter; The bottom is corresponding phase curve, and transverse axis represents the time, and unit second, the longitudinal axis represents phase value, unit degree.Zero is XY directional data curve, and is YX directional data curve.
Among Fig. 7: 1-electrode, 2-magnetic probe.
Embodiment
EmbodimentA kind of audio magnetotelluric method is optimized acquisition method, comprises open-air lay acquisition system, data acquisition and data processing, and specific practice is as follows:
(1) the open-air acquisition system of laying
According to present general method, referring to Fig. 7: during EH4 electromagnetic sounding system field work, general press X, Y-direction layout four measuring electrode and a ground-electrode 1, and two magnetic probes 2 of corresponding layout, measure respectively electric field signal Ex, Ey and field signal Hx, the Hy of both direction;
(2) data acquisition
Survey the district for every one, at first in EH4 electromagnetic sounding system, create a new working directory, then move the IMAGEM program, trap frequency, initial period, X and the running parameters such as Y-direction spread of electrodes and low frequency drainage pattern are set;
Before each measuring point begins image data, the setting that gains first, the gain set-up mode is automatic gain setting or manual gain setting; By record measuring point information, measurement parameter and record measurement data data acquisition process;
Each data acquisition is comprised of one or more time time serieses in a special frequency band; After in the end a time series was measured and finished, the data that gather in each process were stored in the time series file, and through processing, all were stored as " stack " cross-power spectrum result of accumulative total for all records; After finishing, each gatherer process will show each " stack " resulting impedance results; Data acquisition modes is on same measuring point, and by the mode image data that each stack gathers for 6 times 5 times, such measuring point just has 5 groups of data, and in fact total stacking fold is 30 times;
(3) data are processed
At first 5 groups of data of each measuring point are carried out respectively the ROBUST conversion; Then 5 groups of data additions are average, 5 groups of data are merged into one group of data.
Test examplesWe tested in the Yuzhong, Gansu Xinglong Mountain on March 30th, 2012 to March 31, had gathered altogether 12 measuring points, and point is apart from 50 meters.Each measuring point carries out the control test of data acquisition, and namely each measuring point gathers once by 30 stacks of prior art, gathers 5 times according to 6 stacks of the present invention again.We randomly draw three measuring points, i.e. measuring point S3, measuring point S6 and measuring point S11; The Data Comparison figure of measuring point S3 dual mode collection sees Fig. 1 and Fig. 2; The Data Comparison figure of measuring point S6 dual mode collection sees Fig. 3 and Fig. 4; The Data Comparison figure of measuring point S11 dual mode collection sees Fig. 5 and Fig. 6,
Obviously can find out from three measuring point curve comparisons, in the situation that curve type is constant, curve obtained of the present invention is obviously round and smooth, and the quality of data significantly improves, and processes explanation for late time data and has established solid foundation.
Claims (1)
1. an audio magnetotelluric method is optimized acquisition method, comprises open-air lay acquisition system, data acquisition and data processing, it is characterized in that concrete steps are as follows:
(1) the open-air acquisition system of laying
During EH4 electromagnetic sounding system field work, generally press X, Y-direction is arranged four measuring electrode and a ground-electrode, and two magnetic probes of corresponding layout are measured respectively electric field signal Ex, Ey and field signal Hx, the Hy of both direction;
(2) data acquisition
Survey the district for every one, at first in EH4 electromagnetic sounding system, create a new working directory, then move the IMAGEM program, trap frequency, initial period, X and the running parameters such as Y-direction spread of electrodes and low frequency drainage pattern are set;
Before each measuring point begins image data, the setting that gains first, the gain set-up mode is automatic gain setting or manual gain setting; Data acquisition is record measuring point information, measurement parameter and record measurement data, and data acquisition is finished by recording these processes;
Each data acquisition is comprised of one or more time time serieses in a special frequency band; After in the end a time series was measured and finished, the data that gather in each process were stored in the time series file, and through processing, all were stored as " stack " cross-power spectrum result of accumulative total for all records; After finishing, each gatherer process will show each " stack " resulting impedance results; Data acquisition modes is on same measuring point, gathers 5 times mode image data 6 times by each stack, and such measuring point just has 5 groups of data, and in fact total stacking fold is 30 times;
(3) data are processed
Carrying out data by following program processes: at first 5 groups of data of each measuring point are carried out respectively the ROBUST conversion; Then 5 groups of data additions are average, 5 groups of data are merged into one group of data.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103267980A (en) * | 2013-05-29 | 2013-08-28 | 上海艾都能源科技有限公司 | Geophysical prospecting method and measuring device for earth electromagnetic field source correction |
| CN103389514A (en) * | 2013-07-18 | 2013-11-13 | 中国科学院地质与地球物理研究所 | MT (magnetotelluric) denoising device and method |
| CN105204078B (en) * | 2014-06-09 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of method calculating the three-dimensional main impedance of telluric electromagnetic sounding |
| CN107037492A (en) * | 2017-05-26 | 2017-08-11 | 贵州省地质矿产勘查开发局0三地质大队 | A kind of Analysing Geological Data modeling method |
| CN108267787A (en) * | 2018-01-29 | 2018-07-10 | 中国地质科学院地球物理地球化学勘查研究所 | Electromagnetism separation AMT detection methods, device and equipment |
| CN111897014A (en) * | 2020-06-24 | 2020-11-06 | 中铁第一勘察设计院集团有限公司 | Audio magnetotelluric optimized acquisition method |
| CN114047554A (en) * | 2021-11-05 | 2022-02-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Earth resistivity model modeling method and device, computer equipment and storage medium |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267980A (en) * | 2013-05-29 | 2013-08-28 | 上海艾都能源科技有限公司 | Geophysical prospecting method and measuring device for earth electromagnetic field source correction |
| CN103267980B (en) * | 2013-05-29 | 2015-10-14 | 上海艾都能源科技有限公司 | The geophysical prospecting method of earth electromagnetic field field source correction and measurement mechanism |
| CN103389514A (en) * | 2013-07-18 | 2013-11-13 | 中国科学院地质与地球物理研究所 | MT (magnetotelluric) denoising device and method |
| CN103389514B (en) * | 2013-07-18 | 2016-04-20 | 中国科学院地质与地球物理研究所 | A kind of mt denoising device and mt denoising method |
| CN105204078B (en) * | 2014-06-09 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of method calculating the three-dimensional main impedance of telluric electromagnetic sounding |
| CN107037492A (en) * | 2017-05-26 | 2017-08-11 | 贵州省地质矿产勘查开发局0三地质大队 | A kind of Analysing Geological Data modeling method |
| CN108267787A (en) * | 2018-01-29 | 2018-07-10 | 中国地质科学院地球物理地球化学勘查研究所 | Electromagnetism separation AMT detection methods, device and equipment |
| CN108267787B (en) * | 2018-01-29 | 2019-09-10 | 中国地质科学院地球物理地球化学勘查研究所 | Electromagnetism separates AMT detection method, device and equipment |
| CN111897014A (en) * | 2020-06-24 | 2020-11-06 | 中铁第一勘察设计院集团有限公司 | Audio magnetotelluric optimized acquisition method |
| CN114047554A (en) * | 2021-11-05 | 2022-02-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Earth resistivity model modeling method and device, computer equipment and storage medium |
| CN114047554B (en) * | 2021-11-05 | 2024-04-02 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Earth resistivity model modeling method, apparatus, computer device and storage medium |
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Inventor after: Zhu Guangxi Inventor after: Wang Shunping Inventor after: Ning Gang Inventor after: Han Yongqi Inventor after: Zhang Xingchang Inventor after: Li Jianping Inventor after: Cai Shaofeng Inventor after: Li Laixi Inventor after: Zhang Jun Inventor after: Zhang Guangbao Inventor before: Zhu Guangxi Inventor before: Wang Shunping Inventor before: Ning Gang Inventor before: Han Yongqi Inventor before: Zhang Xingchang Inventor before: Li Jianping Inventor before: Cai Shaofeng Inventor before: Li Laixi Inventor before: Zhang Jun Inventor before: Zhang Guangbao |
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Application publication date: 20130116 |