黑色页岩氧化还原条件与有机质富集机制——以昭通页岩气示范区A井五峰组-龙马溪组下段为例

doi:10.11743/ogg20170512

Abstract

Abstract: The Wufeng-lower Longmaxi Formations are the main exploration targets of the Zhaotong shale gas demonstration area.Based on systematic tests of organic carbon,trace elements and REE (rare earth elements) upon samples from Well A in the area,as well as petrological and logging data,we analyzed the variations of geochemical parameters of relevant elements in black shale samples from Well A and tried to reveal the redox conditions of black shale and discuss the possible mechanisms of organic matter enrichment in the area.The results show that the sub-member I of the Wufeng-lower Longmaxi Formations in the area have the highest content of TOC,which is averaged at 3.13% and displays an upward decreasing trend.The enrichment of relevant elements is also observed to be connected with TOC content.Redox parameters such as trace elements and REE indicate that the Wufeng-lower Longmaxi Formations had once experienced anaerobic redox water body turning to a suboxidizing water body with the sub-member I in an anoxic-anaerobic environment,the sub-member Ⅱ in an anoxic environment and the sub-member Ⅲ in an anoxic -oxygen enriched environment.Among them the water body reducibility of layers I-1,I-3,and I-4,is stronger than that of layers I-2 and I-5.And there were still disparities in the forming mechanisms of redox environment for organic matter enrichment in black shale of the Wufeng and Longmaxi Formations against a high paleo-productivity in the area.For the Wufeng Formation,it was a stagnant water body that preserved the organic matter in an anaerobic-anoxic environment,and for the lower Longmaxi Formation,it was sea level rising that kept a rich organic matter in an anaerobic environment.The sub-member I at the Wufeng-lower Longmaxi Formations has the richest TOC and thus is regarded as the best target for shale gas development.

Key words: redox condition, organic matter enrichment, trace element, rare earth element, shale gas, black shale

CLC Number:

TE121.1

Wang Pengwan, Zhang Lei, Li Chang, Li Xianjing, Zou Chen, Zhang Zhao, Li Junjun, Li Qingfei. Redox conditions and organic enrichment mechanisms of black shale:A case from the Wufeng-lower Longmaxi Formations in Well A in Zhaotong shale gas demonstration area[J]. Oil & Gas Geology, 2017, 38(5): 933-943.

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Redox conditions and organic enrichment mechanisms of black shale:A case from the Wufeng-lower Longmaxi Formations in Well A in Zhaotong shale gas demonstration area

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