The application of wide field electromagnetic method to shale gas exploration in Wuling Mountain area: A case study of Tongzi area in northern Guizhou
LI Di-Quan1,2,3(), WANG Zhen-Xing1,2,3, HU Yan-Fang1,2,3, WANG Han1,2,3, SU Yu-Di1,2,3
1.School of Geosciences and Info-Physics, Central South University, Changsha 410083, China 2.Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University), Ministry of Education, Changsha 410083, China 3.Key Laboratory of non-ferrous and geological hazard detection, Changsha 410083, China
After the major breakthrough in oil and gas was obtained from the Well Anye 1, the Ministry of Natural Resources increased the residual shale gas and oil and gas exploration and development of 7,800 square kilometers in the Wuling Mountain. The Wulong Mountain area has complex geological structures, undulating terrain and large areas of carbonate rock, which has led to great challenges to traditional oil and gas exploration methods based on seismic exploration. Wide field electromagnetic method has the characteristics of green, high efficiency and low cost, and hence has become one of the powerful methods for oil and gas exploration and is now being widely used in shale gas exploration in southern China. It is a favorable method for shale gas exploration in southern China. The strata in Tongzi Guizhou are relatively stable, and the organic carbon content in the upper Ordovician Wufeng-Lower Silurian Longmaxi Formation is high. Through surface sample collection and well logging data analysis, the organic shale in this formation shows obvious low resistivity characteristics, which has the physical conditions of electromagnetic exploration. The wide field electromagnetic method was used to carry out shale gas exploration in Tongzi area of northern Guizhou, which overcame the complex influence of topography, carbonate rocks and structure. It is found that the structure pattern of Tongzi area is characterized by "depression and uplift" from northeast to southwest. The spatial distribution characteristics of the Wufeng-Longmaxi Formation in the target layer were detected, and four favorable areas for shale gas exploration were delineated. The prediction of shale gas exploration target area by wide area electromagnetic method is expected to help realize the breakthrough of shale gas exploration and development from point to surface in Wuling Mountain area and promote the development of clean energy industry along the river.
李帝铨, 汪振兴, 胡艳芳, 王涵, 苏煜堤. 广域电磁法在武陵山区页岩气勘探中的探索应用——以黔北桐梓地区为例[J]. 物探与化探, 2020, 44(5): 991-998.
LI Di-Quan, WANG Zhen-Xing, HU Yan-Fang, WANG Han, SU Yu-Di. The application of wide field electromagnetic method to shale gas exploration in Wuling Mountain area: A case study of Tongzi area in northern Guizhou. Geophysical and Geochemical Exploration, 2020, 44(5): 991-998.
Li J Z, Wu X Z, Zheng M, et al. General philosophy,method system and key technology of conventional and unconventional oil & gas resource assessment[J]. Natural Gas Geoscience, 2016,27(9):1557-1565.
doi: 10.11764/j.issn.1672-1926.2016.09.1557
Dong D Z, Wang Y M, Li X J, et al. Breakthrough and prospect of shale gas exploration and development in China[J]. Natural Gas Industry, 2016,36(1):19-32.
Zhang P, Zhang J C, Lei H Y, et al. Sedimentary environment and its influence on shale gas accumulation of Songkan formation of Anye-1 well district in northern Guizhou[J]. Resources & Industries, 2018,20(3):34-41
Teng J W, Liu Y S. Analysis of diatribution storage potential and prospect for shale oil and gas in China[J]. Progress in Geophysics, 2013,28(3):1083-1108.
doi: 10.6038/pg20130301
Zhang B J, Han Z Q, Zhang W, et al. Research on shale gas of Wufeng-Longmaxi formation, Guizhou Province[J]. Natural Gas Technology and Economy, 2017,11(6):19-23.
Yan J F. The shale gas accumulation conditions and distribution characteristics of black shales in the Upper Ordovician Wufeng formation—Lower Silurian Longmaxi formation of northern Guizhou[D]. Chengdu: Chengdu University of Technology, 2017.
Zhang Q X, Li D Q, Tian M J. Application of wide field electromagnetic method to the hydrocarbon exploration in a basin of South Jiangxi[J]. OGP, 2017,52(5):1085-1092.
Li D Q, Hu Y F. A comparison of wide field electromagnetic method with CSAMT method in strong interferential mining area[J]. Geophysical and Geochemical Exploration, 2015,39(5):967-972.
doi: 10.11720/wtyht.2015.5.15
He J S. Wide field electromagnetic sounding methods[J]. Journal of Central South University:Science and Technology , 2010,41(3):1065-1072.
[12]
何继善. 广域电磁法和伪随机信号电法[M]. 北京: 高等教育出版社, 2010.
[12]
He J S. Wide field electromagnetic method and pseudorandom signal electrical method [M]. Beijing: Higher Education Press, 2010.
[13]
刘树根, 马文辛, LUBA Jansa, 等. 四川盆地东部地区下志留统龙马溪组页岩储层特征[J]. 岩石学报, 2011,27(8):2239-2252.
[13]
Liu S G, Ma W X, Luba J, et al. Characteristics of the shale gas reservoir rocks in the Lower Silurian Longmaxi Formation,East Sichuan basin,China[J]. Acta Petrologica Sinica, 2011,27(8):2239-2252.
Yin F G, Xu X S, Wan F, et al. Characteristic of seqence and stratigraphical division in evolution of upper yangtze region during Caledonian[J]. Journal of Stratigraphy, 2002(4):315-319.
Suo G Y, Li D Q, Hu Y F. One-dimension parallel constrained inversion of E-Ex wide field electromagnetic method based on analytical Jacobian matrix[J]. Computing Techniques for Geophysical and Geochemical Exploration, 2019,41(1):55-61.
