Application of rock pyrolysis experiment in oil-bearing property evaluation of shale oil reservoir: a case study of the Jurassic Lianggaoshan Formation in the northeastern Sichuan Basin

doi:10.3969/j.issn.1672-7703.2024.01.013

Abstract

Abstract: Shale oil is an important strategic resource to ensure China’s long-term steady and increase of oil production. The evaluation of oil-bearing property and oil mobility has an important guiding significance in sweet spot prediction in shale oil exploration. By applying the liquid nitrogen freezing sampling and rock pyrolysis experiment methods, experimental research on oil-bearing property and mobility evaluation of shale oil series in the Jurassic Lianggaoshan Formation in northeastern Sichuan Basin is conducted, and the influencing factors of oil-bearing property are analyzed. As a result, understanding is obtained in the following four aspects: (1) The liquid nitrogen freezing sampling technology effectively avoids the loss of light hydrocarbons in samples, and the obtained oil-bearing property parameters can better reflect the oil-bearing property of the reservoir; (2) By using the multi-stage rock pyrolysis method, the oil-bearing property is characterized by free oil, bound oil, and solid hydrocarbon content, and the oil mobility is characterized by the proportion of maximum mobile oil content (free oil/total oil content); (3) The oil-bearing property and mobility of shale oil reservoir in Lianggaoshan Formation are jointly affected by organic matter abundance, maturity, lithology, as well as hydrocarbon expulsion, migration, and accumulation in the source rock system. The greater the organic matter abundance, the higher the oil-bearing property of the reservoir, and the higher the maturity, the better the oil mobility. However, a better oil-bearing property and oil mobility will more easily cause the short-distance oil migration and accumulation in the reservoir, thus changing the oil-bearing property of the reservoir; (4) After the comprehensive analysis of oil-bearing property, oil mobility, geochemical characteristics, physical properties of the first and the third members of Lianggaoshan Formation, as well as the development demands of shale oil wells, it is found that the first member of Lianggaoshan Formation is a high-quality interval for shale oil exploration. The rock pyrolysis experiment provides a new idea and method for the evaluation of shale oil-bearing property and oil mobility, which effectively supports the prediction of shale oil sweet spot area and the design of development plan.

CLC Number:

TE125.3

Chen Manfei, Wang Li, He Jiahuan, Tan Jie, Hong Haitao, Zhao Dan, Kong Lingming, Cai Changhong, Tan Yaqian. Application of rock pyrolysis experiment in oil-bearing property evaluation of shale oil reservoir: a case study of the Jurassic Lianggaoshan Formation in the northeastern Sichuan Basin[J]. China Petroleum Exploration, 2024, 29(1): 166-176.

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