Exploration evaluation and recognition of continental shale oil and gas in Fuxing area, Sichuan Basin

doi:10.3969/j.issn.1672-7703.2022.01.010

Abstract

Abstract: The Jurassic lacustrine shale in Sichuan Basin has multiple producing layers and abundant shale oil and gas resources, which is expected to become a major replacement field for “increasing reserve and production” in China. By taking the Jurassic continental shale in Fuxing area as the study object, the geological characteristics of high-quality continental shale reservoirs are summarized, the understanding of continental shale oil and gas accumulation is updated, and three key exploration and development technologies applicable for continental shale oil and gas are proposed. The results show that: (1) During the Early-Middle Jurassic, three sets of high-quality semi-deep lacustrine shale reservoirs were developed in Fuxing area in Sichuan Basin, including the Dongyuemiao member and Da’anzhai member of Ziliujing Formation, and the second member of Lianggaoshan Formation, with the overall characteristics of medium TOC, medium porosity and high clay content; (2) The development and distribution of continental shale reservoir are controlled by sedimentary facies zone, and hydrocarbon enrichment and accumulation is determined by sedimentary environment and preservation conditions. The natural fracture development affects the high yield zone while the thermal evolution degree determines the types of shale oil and gas reservoir; (3) Three key technologies, such as high resolution “sweet spot” prediction technology, high-efficiency geosteering drilling technology of horizontal well and volume fracturing technology for low-brittleness shale reservoir, are applicable to continental shale gas exploration and development. To sum up, the Jurassic continental shale in Fuxing area has promising resource potential, and it has good exploration and development prospects by applying the existing technologies.

CLC Number:

TE122

Wei Zhihong, Liu Ruobing, Wei Xiangfeng, Chen Feiran, Liu Zhujiang, Wang Daojun. Exploration evaluation and recognition of continental shale oil and gas in Fuxing area, Sichuan Basin[J]. China Petroleum Exploration, 2022, 27(1): 111-119.

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