四川盆地五峰组-龙马溪组页岩气高产地质原因及启示——以涪陵页岩气田JY6-2HF为例

doi:10.11743/ogg20200303

Abstract

Abstract: The great success of shale gas development in Fuling (the cumulative production of Well JY6-2HF has exceeded 300 million cubic meters) provides new enlightenment for the exploration and development of Wufeng-Longmaxi Formations' shale gas reservoir.The keys for the success are:(1) the Wufeng-Longmaxi Formations in Jiaoshiba area were deposited in deep water.The WF2-LM4 graptolitic zone shale is relatively thick,laying a better material basis for shale gas enrichment.(2) The lateral of Well JY6-2HF is mainly emplaced in WF2-LM4 graptolitic zone,which contains high-quality shale comparable to the "Lower Hot Shale" in Middle East-North Africa.Most of the laterals of shale gas wells in Weiyuan and Changning shale gas fields are also emplaced in this graptolitic zone,which is characterized by high total organic carbon content (TOC >3%) and high gas content (6.87-9.02 m³/t),and highly-developed organic pores (organic porosity >4%).Comprehensive analysis shows that under similar geological and engineering conditions,the wells with longer laterals emplaced in WF2-LM4 graptolitic zone generally have higher test production and estimated ultimate recovery (EUR).The research results are of referential value to the exploration and development of Wufeng-Longmaxi Formations' shale gas in Sichuan Basin and its periphery,and of the Silurian shale gas in other parts of the world.

Key words: Well JY6-2HF, Wufeng-Longmaxi Formations, shale gas, graptolitic zone, Jiaoshiba, Sichuan Basin

CLC Number:

TE122.2

Nie Haikuan, Zhang Baiqiao, Liu Guangxiang, Yan Caina, Li Donghui, Lu Zhiyuan, Zhang Guangrong. Geological factors contributing to high shale gas yield in the Wufeng-Longmaxi Fms of Sichuan Basin: A case study of Well JY6-2HF in Fuling shale gas field[J]. Oil & Gas Geology, 2020, 41(3): 463-473.

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Geological factors contributing to high shale gas yield in the Wufeng-Longmaxi Fms of Sichuan Basin: A case study of Well JY6-2HF in Fuling shale gas field

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