Hydrocarbon accumulation characteristics and exploration orientation of intra-source tight gas in Sichuan Basin

doi:10.3969/j.issn.1672-7703.2025.03.005

Abstract

Abstract: With the increasing maturity of petroleum exploration in petroliferous basins in China, it is necessary to expand strategic replacement fields for oil and gas industry development. Recent exploration breakthroughs reveal that the resource potential of intra-source tight gas exceeds 1×10¹² m³ in Sichuan Basin, emerging as a prospective new strategic replacement field. The fine core description, logging data interpretation, and geochemical analysis data of a large number of core samples have been integrated to analyze the genetic type and distribution characteristics of intra-source tight gas in Sichuan Basin, identify the hydrocarbon accumulation and enrichment laws, and clarify resource potential and future exploration orientations. The study results show that: (1) Influenced by multicyclic tectonic evolution and frequent sea–lake level fluctuations, multiple sets of high-quality thick source rocks were developed in Sichuan Basin, forming multi-type marine and continental intra-source tight gas reservoirs. (2) There are two types of source rock and reservoir assemblages of intra-source tight gas reservoirs. One is near-source gas accumulation, which is enveloped by source rocks, showing superior sealing conditions, such as tight gas in Qiongzhusi Formation and the fifth member of Xujiahe Formation; The other is source rock and reservoir integrated gas reservoir with high-pressure sealing conditions, such as marine marl tight gas in the second sub-member of the third member of Leikoupo Formation and the first member of Maokou Formation. (3) The estimated resources of the four sets of intra-source tight gas are more than 4×10¹² m³, including tight sandstone gas in Qiongzhusi Formation, tight marl gas in Leikoupo Formation, tight marl gas in the first member of Maokou Formation, and tight sandstone gas in the fifth member of Xujiahe Formation, showing major fields for further exploration, among which Ziyang–Penglai area is the most favorable area for Qiongzhusi Formation tight gas, the southern–central Sichuan Basin is the prospective area for marine marl tight gas, and Penglai–Jinhua area is a favorable exploration area for tight gas in the fifth member of Xujiahe Formation.

Key words: Sichuan Basin, intra-source tight gas, Qiongzhusi Formation, the first member of Maokou Formation, Xujiahe Formation, resource potential

CLC Number:

TE122.1

Xie Wuren, Wang Zecheng, Luo Bing, Zheng Majia, Ma Shiyu, Chen Yana, Xin Yongguang, Yang Rongjun. Hydrocarbon accumulation characteristics and exploration orientation of intra-source tight gas in Sichuan Basin[J]. China Petroleum Exploration, 2025, 30(3): 65-77.

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