大地电磁测深在湘东南坳陷页岩气勘探中的应用

doi:10.11720/wtyht.2019.1280

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Abstract

To understand the deep structure characteristics and the distribution and lithology of the main Devonian-Permian shale gas strata on the southwestern side of Southeast Hunan Depression, the authors carried out the processing and qualitative-quantitative analysis of data from four magnetotelluric sounding profiles in Yuanjia syncline. Based on the apparent resistivity section, impedance phase analysis and two-dimensional continuous media inversion of magnetotelluric sounding data and combined with the geological characteristics and physical properties of the study area, the authors found out the location, nature and development characteristics of main fractures as well as the spatial distribution of the main geological formation (electrical layer). On such a basis, the favorable shale gas strata exploration was discussed. The results show that the majority of the faults trend in SN, NE and NW directions in the Yuanjia syncline, showing structures such as "listric style" and "flat and ramp style" in the section. The Upper Permian Longtan Formation has high quality gas-bearing coalbed and good exploration prospect of coalbed methane. The low resistance shale of the lower member of Middle Devonian Qiziqiao Formation is continuous and thick, and hence it can be regarded as a favorable exploration shale formation.

Key words： magnetotelluric sounding structure characteristics shale gas exploration Southeast Hunan Depression

Received: 17 July 2018 Published: 10 April 2019

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	Wei TIAN
	Xu-Bing LI
	Bao-Zhong WANG

Cite this article:

Wei TIAN,Xu-Bing LI,Bao-Zhong WANG. The application of magnetotelluric sounding to shale gas exploration in Southeast Hunan Depression[J]. Geophysical and Geochemical Exploration, 2019, 43(2): 281-289.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1280 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I2/281

Structural and magnetotelluric sounding profile location in the study area

Apparent resistivity frequency profile of MT1-MT4

Processing and interpretation process of magnetotelluric sounding data

The structural characteristics of geological profile lines in the study area

地层	岩性	电性	厚度/m	顶面高程/m
三叠系大冶组— 二叠系(Td—P)	硅质灰岩、钙质泥岩、泥质灰岩	中低阻	400~1300	350~200	两翼较缓, 10°~30°, 核部较陡, 35°~65°
石炭系(C)	灰岩、白云岩	中高阻	50~1500	250~-1400
泥盆系锡矿山组— 棋梓桥组上中部( $D 31$ )	灰岩、白云岩、白云质灰岩	高阻	200~2000	350~-500
泥盆系棋梓桥组下部( $D 32$ )	泥质灰岩、泥质页岩	低阻	200~2500	350~-2500
泥盆系跳马涧组( $D 32$ )	砂岩	高阻	500~1800	-500~-4000
寒武系基底(∈)	炭质、泥质板岩	中低阻	300~3000

Comprehensive stratigraphic interpretation results

Two-dimensional continuum inversion profile(left) and geological interpretation(right) of MT1—MT4

Comprehensive faults interpretation results

Comprehensive interpretation results of coal bed of 2015H-D6 well

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