“Source-Diagenesis-Accumulation” enrichment and accumulation regularity of marine shale gas in southern China

Gang-yi Zhai; Yu-fang Wang; Zhi Zhou; Guo-heng Liu; Yu-ru Yang; Juan Li

doi:10.31035/cg2018059

2018 Vol. 1, No. 3

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Article navigation > China Geology > 2018 > 1(3): 319-330

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Gang-yi Zhai, Yu-fang Wang, Zhi Zhou, Guo-heng Liu, Yu-ru Yang, Juan Li, 2018. “Source-Diagenesis-Accumulation” enrichment and accumulation regularity of marine shale gas in southern China, China Geology, 1, 319-330. doi: 10.31035/cg2018059

Citation:

“Source-Diagenesis-Accumulation” enrichment and accumulation regularity of marine shale gas in southern China

a.
Oil and Gas Survey, China Geological Survey, Beijing 100029, China
b.
Unconventional oil and gas geology laboratory, China Geological Survey, Beijing 100029, China

More Information

Corresponding authors: zhaigangyi@126.com (Gang-yi Zhai); 147444819@qq.com (Yu-fang Wang)

Received Date: 12 August 2018

Revised Date: 10 September 2018

Accepted Date: 11 September 2018

Available Online: 11 September 2018

Publish Date: 25 November 2018

Abstract

Abstract

After the breakthrough of shale gas exploration and development in the Ordovician Wufeng Formation (Fm.) and Silurian Longmaxi Fm. of Chongqing Jiaoshiba area, Changning-Weiyuan area, etc. in Sichuan basin, a series of discovery and breakthrough were obtained by China Geological Survey in the Cambrian Niutitang Fm. and Sinian Doushantuo Fm. shale of the areas with complicated structure outside Sichuan basin. Based on the understanding of the law of shale gas enrichment in Longmaxi Fm. in the basin, this paper puts forward three elements of the formation and enrichment of shale gas, which are the “Source”, the “Diagenesis” and the “Accumulation”, after deeply studying the law shale gas enrichment and accumulation in Sinian-Cambrian reservoir of the complex structure area outside the basin. The “Source” means the sedimentary environment and petrological characteristics of organic shale. The “Diagenesis” means the basin tectonic subsidence and hydrocarbon generation and expulsion process of organic matter. The “Accumulation” means the tectonic uplift and shale gas preservation. It is proposed that the Sinian-Cambrian and Ordovician-Silurian black shale series in the middle and upper Yangtze region of southern China were both formed in the deep-water shelf environment of rift trough and foreland basin respectively. The dessert intervals were formed in the strong reduction environment under transgressive system tract. The shale lithology belongs to calcium-siliceous and charcoal-siliceous respectively. Based on the summary of structural evolution in Yangtze area, the correlation of structural burial depth with shale diagenesis and the coupling evolution of organic matter with pore structure are discussed. Combining with structural styles, the preservation conditions of shale gas are discussed. Five types of shale gas reservoir control models are further described. Two types of future exploration directions, which are reverse fault syncline and paleo-uplift margin in complex structural area outside the basin, are proposed.
- Shale gas /
- Exploration and development /
- Enrichment and accumulation /
- Reservoir controlling models /
- Exploration direction

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References

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