川东红星地区上二叠统吴家坪组页岩发育特征及其页岩气富集意义

doi:10.11743/ogg20220508

Abstract

Abstract:

The Wujiaping marine shale of the Upper Permian in the eastern Sichuan Basin is an important successor for shale gas exploration in the Sichuan Basin， where shale gas enrichment conditions and favorable exploration intervals are yet to be clarified. The study investigates source rocks and reservoir quality of the Wujiaping shale in Well HY 1 and their changes in vertical via petrology and geochemistry analysis， reservoir description and characterization as well as gas-bearing potential test， and the exploration prospects are thereby identified. Results show that the organic-rich shale is developed in the first sub-member of the first member of the Wujiaping Formation （Wu1¹） of tidal flat-lagoon facies and the second member （Wu2） of deep shelf facies. To be specific， the Wu1¹ is dominated by argillaceous shale， Wu2¹by^{mixed siliceous shale and siliceous shale， and the Wu2² by siliceous shale and calcareous shale. Compared with the argillaceous shale in the Wu1¹， the mixed siliceous and siliceous shale in the Wu2 is characterized by high brittle mineral content （63.2 %）， high organic matter abundance （TOC = 8.87 %）， favorable organic matters （Type Ⅱ₁）， well-developed organic pores， and good physical properties （a porosity of 5.59 %）. Among others， the source rock quality and reservoir capacity of the Wu2¹ are better than those of the Wu2². It can be concluded that the organic-rich shale of the Wu2¹ is favorable for shale gas exploration in the study area.}

Key words: source rock quality, reservoir quality, deep shelf facies, shale, Wujiaping Formation, Upper Permian, Hongxing area, Sichuan Basin

CLC Number:

TE122.1

Pengwei Wang, Zhongbao Liu, Xiong Li, Haotian Liu, Lin Zhou, Xiong Xiao, Ruyue Wang, Peng Li. Development of the Upper Permian Wujiaping shale in Hongxing area， eastern Sichuan Basin， and its significance to shale gas enrichment[J]. Oil & Gas Geology, 2022, 43(5): 1102-1114.

Figures/Tables 12

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Table 1

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Table 2

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层位	深度/m	岩性	R_b最小值/%	R_b最大值/%	R_b平均值/%	测点数/个	换算R_o/%
吴二段	3 294.05	黑色硅质页岩	2.22	3.10	2.56	30	2.02
吴二段	3 307.34	黑色硅质页岩	2.31	3.18	2.69	28	2.10
吴一段	3 323.59	泥岩	2.60	3.09	2.83	40	2.20

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Development of the Upper Permian Wujiaping shale in Hongxing area， eastern Sichuan Basin， and its significance to shale gas enrichment

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