Constrained inversion method and application effect of TEM data of fixed source loop device

Authors

HOU Yanwei, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
YAO Weihua, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China

Abstract

In order to eliminate the obvious framing effect after the TEM fixed source loop device increases the receiving area, to improve the delamination ability of TEM to enhance the fine resolution for different electrical strata, the regularization inversion method with constraint is adopted. In the inversion algorithm, the Lagrange factor is adjusted adaptively by CMD regularization factor. In order to ensure the efficiency, stability and convergence of the results of the inversion process, the thickness of each layer of the inversion model is discretized according to the equal logarithmic interval, and the ill conditioned property of the matrix equation is reduced. At the same time, a feasible upper and lower limit is used for the inversion of the resistivity value, so that the extreme value or the error value can not appear in the results of the iteration, and the multi solution of the inversion is reduced. Through the calculation of the multi-layer theoretical model, the correctness and reliability of the constrained inversion algorithm are proved. It is used in the inversion calculation of the measured data of the transient electromagnetic method. The vertical distribution of the inversion resistivity is consistent with the data of the known stratum, and the abnormal area is verified by drilling, and the result is reliable.

Keywords

fixed source loop device, transient electromagnetic method(TEM), constrained inversion method, application effect

DOI

10.3969/j.issn.1001-1986.2019.04.026

Recommended Citation

H Y. (2019) "Constrained inversion method and application effect of TEM data of fixed source loop device," Coal Geology & Exploration: Vol. 47: Iss. 4, Article 27.
DOI: 10.3969/j.issn.1001-1986.2019.04.026
Available at: https://cge.researchcommons.org/journal/vol47/iss4/27

Reference

[1] 薛国强,于景邨. 瞬变电磁法在煤炭领域的研究与应用新进展[J]. 地球物理学进展,2017,32(1):319-326. XUE Guoqiang,YU Jingcun. New development of TEM research and application in coal mine exploration[J]. Progress in Geophysics,2017,32(1):319-326.

[2] XUE Guoqiang,BAI Chaoying,YAN Shu,et al. Deep sounding TEM investigation method based on a modified fixed central-loop system[J]. Journal of Applied Geophysics,2012,76(1):23-32.

[3] 张成范,翁爱华,孙世栋,等. 计算矩形大定源回线瞬变电磁测深全区视电阻率[J]. 吉林大学学报(地球科学版),2009,39(4):755-758. ZHANG Chengfan,WONG Aihua,SUN Shidong,et al. Computation of whole-time apparent reisistivity of large rectangular loop[J]. Journal of Jilin University(Earth Science Edition),2009,39(4):755-758.

[4] 李建慧,朱自强,刘树才,等. 模拟退火法计算大定源瞬变电磁法的视电阻率[J]. 石油地球物理勘探,2011,46(1):138-142. LI Jianhui,ZHU Ziqiang,LIU Shucai,et al. Calculation of apparent resistivity of large fixed source transient electromagnetic method by simulated annealing[J]. Oil Geophysical Prospecting,2011,46(1):138-142.

[5] 丁艳飞,白登海,许诚. 均匀半空间表面大定源瞬变电磁响应的快速算法[J]. 地球物理学报,2012,55(6):2087-2096. DING Yanfei,BAI Denghai,XU Cheng. A rapid algorithm for calculating time domain transient electromagnetic responses of a large fixed rectangular loop on the half-space[J]. Chinese Journal of Geophysics,2012,55(6):2087-2096.

[6] 刘最亮,王鹤宇. 大定源瞬变电磁法在含水断层构造探测中的应用[J]. 煤田地质与勘探,2012,40(5):67-70. LIU Zuiliang,WANG Heyu. Application of transient electromagnetic method in the detection of water-bearing fault structure[J]. Coal Geology & Exploration,2012,40(5):67-70.

[7] 张维. 大定源瞬变电磁法一维正反演研究[D]. 长沙:中南大学,2013.

[8] 包乃利,刘鸿福,余传涛. 大定源瞬变电磁法激励场及边框效应研究[J]. 煤田地质与勘探,2014,42(2):80-84. BAO Naili,LIU Hongfu,YU Chuantao. The research on the primary field and rim effect of transient electromagnetic method with large fixed loop[J]. Coal Geology & Exploration,2014,42(2):80-84.

[9] 戚志鹏,智庆全,李貅,等. 大定源瞬变电磁三分量全域视电阻率定义与三分量联合反演[J]. 物探与化探,2014,38(4):742-749. QI Zhipeng,ZHI Qingquan,LI Xiu,et al. The definition of the full-zone apparent resistivity and the constrained inversion of the three components of fixed source TEM[J]. Geophysical and Geochemical Exploration,2014,38(4):742-749.

[10] 赵越,李貅,王祎鹏. 大回线源瞬变电磁全域视电阻率定义[J].地球物理学进展,2015,30(4):1856-1863. ZHAO Yue,LI Xiu,WANG Yipeng. Full-domain apparent resistivity definition for large loop TEM[J]. Progress in Geophysics,2015,30(4):1856-1863.

[11] 戴锐,张达,冀虎. 大定源瞬变电磁法反演效果分析[J]. 有色金属(矿山部分),2017,69(3):1-4. DAI Rui,ZHANG Da,JI Hu. Analysis of inverse effect of large fixed source transient electromagnetic method[J]. Nonferrous Metals(Mining Section),2017,69(3):1-4.

[12] 石显新,闫述,傅君眉,等. 瞬变电磁法中心回线装置资料解释方法的改进[J]. 地球物理学报,2009,52(7):1931-1936. SHI Xianxin,YAN Shu,FU Junmei,et al. Improvement for interpretation of central loop transient electromagnetic method[J]. Chinese Journal of Geophysics,2009,52(7):1931-1936.

[13] 陈小斌,赵国泽,汤吉,等. 大地电磁自适应正则化反演算法[J]. 地球物理学报,2005,48(4):937-946. CHEN Xiaobin,ZHAO Guoze,TANG Ji,et al. An adaptive regularized inversion algorithm for magnetotelluric data[J]. Chinese Journal of Geophysics,2005,48(4):937-946.