Occurrence Model and Enrichment Mechanism of Cambrian Shale Gas Around Paleo-uplift in the Mid-Yangtze Region

CHENXiao-Hong; LIHai; MIAOFeng-Bin; LUOSheng-Yuan

doi:10.3969/j.issn.2097-0013.2022.03.003

2022 Vol. 38, No. 3

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Article navigation > South China Geology > 2022 > 38(3): 394-407

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CHENXiao-Hong, LIHai, MIAOFeng-Bin, LUOSheng-Yuan. 2022. Occurrence Model and Enrichment Mechanism of Cambrian Shale Gas Around Paleo-uplift in the Mid-Yangtze Region. South China Geology, 38(3): 394-407. doi: 10.3969/j.issn.2097-0013.2022.03.003

Citation:

CHENXiao-Hong, LIHai, MIAOFeng-Bin, LUOSheng-Yuan. 2022. Occurrence Model and Enrichment Mechanism of Cambrian Shale Gas Around Paleo-uplift in the Mid-Yangtze Region. South China Geology, 38(3): 394-407. doi: 10.3969/j.issn.2097-0013.2022.03.003

Occurrence Model and Enrichment Mechanism of Cambrian Shale Gas Around Paleo-uplift in the Mid-Yangtze Region

Wuhan Center of China Geological Survey (Central South China Innovation Center for Geosciences, Wuhan 430205, Hubei, China

Received Date: 22 July 2022

Revised Date: 28 July 2022

Abstract

Abstract

Based on the analysis of micro-pore structure type and their influencing factor of gas-bearing shale reservoir in Huangling and Xuefeng uplifts and their adjacent region, combined with the comparative study of resolution curves between shale gas and coaled methane, the occurrence model and enrichment mechanism of Cambrian shale gas around paleo-uplift in the mid-Yangtze area are discussed in this paper. It is concluded that (1) The primary matrix pore of high-mature shale is filled with asphaltenes, and the micro-space of the high-mature shale gas reservoir is mainly derived from secondary pore caused by asphaltene hydrocarbon generation and expulsion, as well as micro-facture caused by structure activities. (2) The resolution curves of high-mature shale gas and coaled methane are similar, which proves that they have similar reservoir and mobility behaviors. Microfracture filling, organic and micropore adsorption and aqueous solution dissolution are the main types of occurrence for shale gas. (3)Shale gas enrichment is the result of TOC combined with specific thermal evolution and tectonic preservation conditions .
- shale gas /
- occurrence model /
- enrichment mechanism /
- high-mature /
- Cambrian /
- the Mid-Yangtze region

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References

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