Study on reservoir characteristics and exploration field of the Middle Triassic Leikoupo Formation in Sichuan Basin

doi:10.3969/j.issn.1672-7703.2022.04.007

Abstract

Abstract: The Triassic Leikoupo Formation is an important strategic preparation field for gas exploration in Sichuan Basin. In recent years,Pengzhou Gas Field has been proved in the western Sichuan Basin, gas flow has been achieved in Well Xingtan 1 in the southwestern basin,and unconventional gas reservoir has been discovered in Well Chongtan 1 in the central basin, showing good exploration prospects of Leikoupo Formation. By integrating well and seismic data, the comprehensive study on reservoir and hydrocarbon accumulation characteristics is conducted and new understanding is obtained in three aspects: (1) There are two exploration fields of conventional and unconventional gas reservoirs of Leikoupo Formation in Sichuan Basin; (2) The Indosinian paleo uplift controlled the development and migration of “double beach zones” (Longmenshan barrier mound beach zone in the Western Sichuan and lagoon marginal beach zone in the Central Sichuan Basin),in which the large-scale reservoirs were developed. The area close to the hydrocarbon source center is a favorable zone for conventional gas exploration; (3) The integrated source rock and reservoir assemblage is widely developed in lagoon facies marl in the third member of Leikoupo Formation (Lei 3 member) in the Central Sichuan Basin, forming a tight gas reservoir system sealed by gypsum rocks at the roof and floor. It is inferred that the continuously distributed tight gas reservoirs occur in Lei 3 member in the Central Sichuan Basin, which is a new field for unconventional gas exploration.

CLC Number:

TE112.2

Xin Yongguang, Wen Long, Zhang Hao, Tian Han, Wang Xin, Sun Haofei, Xie Zengye. Study on reservoir characteristics and exploration field of the Middle Triassic Leikoupo Formation in Sichuan Basin[J]. China Petroleum Exploration, 2022, 27(4): 91-102.

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