复电阻率法在安徽南陵盆地海相页岩气勘探中的应用

doi:10.11720/wtyht.2022.1336

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Abstract

The main part of the Nanling Basin in Anhui Province is a red Mesozoic continental basin, under which the distribution of marine strata is still undetermined and the potential of shale gas resources is unidentified. Based on the physical property characteristics that the Permian organic-rich shale reservoirs around the study area contain pyrite, this study carried out a geological survey of shale gas using the complex resistivity method. Specifically, this study designed an observation system suitable for the different geological characteristics inside and outside the basin, conducted fitting and inversion using Cole-Brown and Cole-Cole models, and plotted maps of near-field parameters electromagnetic resistivity and apparent charging rate. The results show that: (1) The Permian organic-rich shale contains high carbonaceous content and rich pyrite particles and has distinct characteristics of low resistivity and high polarizabi-lity. Therefore, it can be effectively distinguished from its surrounding rocks, which is favorable for the shale gas exploration using the complex resistivity method; (2) Polarizability is an effective parameter that can be used to identify deep organic-rich shale strata and even shale gas reservoirs; (3) Drilling tests were carried out based on the exploration results obtained using the complex resistivity method, successfully discovering the Triassic carbonate strata and predicting that below the red basin in the Nanling Basin is the favorable area of Permian shale gas reservoirs. This study demonstrates that the complex resistivity method can detect pyrite-bearing shale strata with a depth of greater than 2,000 m and a cumulative thickness of about 200 m in the Nanling Basin and is the only method that can directly indicate shale gas reservoirs in electromagnetic exploration. Therefore, the complex resistivity method can be applied to the geophysical prospecting of the marine shale gas in the Nanling Basin with complex geological conditions and even Southern China. The results of this exploration also provide a basis for the further exploration of the marine shale gas in the Nanling Basin.

Key words： complex resistivity method Nanling Basin marine shale in South China organic-rich shale shale gas geophysical prospecting

Received: 10 June 2021 Published: 21 June 2022

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	Qi-Chun YIN
	Yuan-Jun WANG
	Dao-Rong ZHOU
	Li ZHANG
	Tong SUN

Cite this article:

Qi-Chun YIN,Yuan-Jun WANG,Dao-Rong ZHOU, et al. Application of complex resistivity method to the exploration of marine shale gas in the Nanling Basin, Anhui Province[J]. Geophysical and Geochemical Exploration, 2022, 46(3): 668-677.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1336 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I3/668

Distribution map of measuring points by complex resistivity method in the Nanling Basin

Photos of pyrite distribution in Permian shale in southern Anhui Province

Resistivity logging curve of Well WYD1

Statistical table of comprehensive electrical stratification in the study area

Instrument and observation system configuration diagram

Complex resistivity method data processing process

Inversion and geological interpretation sections of electromagnetic resistivity and visual charge rate of CR method

Inversion characteristics of electromagnetic resistivity(a) and apparent charge rate(b) around well Jingye 1

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