Characteristics and main controlling factors of gas accumulation of the Middle Permian Qixia Formation in western Sichuan Basin

doi:10.3969/j.issn.1672-7703.2021.06.005

Abstract

Abstract: In recent years, great breakthroughs have been made of the Middle Permian Qixia Formation in western Sichuan Basin, showing great exploration potential. A large number of well drilling, logging, and lab test data are studied to determine the key geological difficulties,such as the stages, evolution, main controlling factors and characteristics of gas accumulation of Qixia Formation in western Sichuan Basin, so as to provide technical support for the exploration in the near future. The study results show that: (1) The methane content and the gas drying coefficient of natural gas of Qixia Formation are more than 96% and 0.99 respectively, showing characteristics of high maturity, which is a typical dry gas and pyrolysis gas generated by the secondary cracking of crude oil; (2) The gas isotope of δ 13C1 ranges from -31.33‰ to -28.31‰,while that of δ 13C2 from -28.5‰ to -25.2‰. The gas-source correlation indicates that the natural gas of Qixia Formation is mainly a mixed type gas reservoir generated by source rock of the Cambrian Qiongzhusi Formation and supplemented by the Middle Permian, but no contribution from source rock of the Silurian Longmaxi Formation; (3) The identified fluid inclusions recorded four stages of hydrocarbon accumulation events. The first and second stages were paleo oil reservoir accumulation in the Middle-Late Triassic and the Late Triassic respectively; The third stage was paleo oil reservoir accumulation in the Early-Middle Jurassic; The fourth stage was paleo gas reservoir accumulation from the Late Jurassic to the Early Cretaceous; (4) The main controlling factors of hydrocarbon accumulation include the large-scale high-quality source rocks, high-quality reservoirs and structural-lithologic traps that supply accommodation for continuous gas accumulation; (5) The concealed front zone of the footwall of the nappe in Shuangyushi - Zhongba area in northwestern Sichuan Basin and Pingluoba - Daxingchang area in southwestern Sichuan Basin have superior conditions for gas accumulation, which are the most favorable areas for further exploration of Qixia Formation in western Sichuan Basin.

CLC Number:

TE112

Wen Long, Wang Hua, Xu Liang, Zhang Ya, Yuan Haifeng, Chen Shuangling, Qiao Yanping, Shen Chen. Characteristics and main controlling factors of gas accumulation of the Middle Permian Qixia Formation in western Sichuan Basin[J]. China Petroleum Exploration, 2021, 26(6): 68-81.

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