页岩油甜点评价关键技术及甜点类型划分: 以玛湖凹陷二叠系风城组为例

王伟; 王振林; 刘财广; 郑孟林; 张融; 郑国庆; 余佩蓉

doi:10.3799/dqkx.2022.333

Volume 48 Issue 1

Jan. 2023

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Article Navigation > Earth Science > 2023 > 48(1): 223-234

Wang Wei, Wang Zhenlin, Liu Caiguang, Zheng Menglin, Zhang Rong, Zheng Guoqing, Yu Peirong, 2023. Key Technology of Shale Oil Sweet Spot Evaluation and Sweet Spot Type Division in Fengcheng Formation of Mahu Sag. Earth Science, 48(1): 223-234. doi: 10.3799/dqkx.2022.333

Citation:

Wang Wei, Wang Zhenlin, Liu Caiguang, Zheng Menglin, Zhang Rong, Zheng Guoqing, Yu Peirong, 2023. Key Technology of Shale Oil Sweet Spot Evaluation and Sweet Spot Type Division in Fengcheng Formation of Mahu Sag. Earth Science, 48(1): 223-234. doi: 10.3799/dqkx.2022.333

Citation:

Wang Wei, Wang Zhenlin, Liu Caiguang, Zheng Menglin, Zhang Rong, Zheng Guoqing, Yu Peirong, 2023. Key Technology of Shale Oil Sweet Spot Evaluation and Sweet Spot Type Division in Fengcheng Formation of Mahu Sag. Earth Science, 48(1): 223-234. doi: 10.3799/dqkx.2022.333

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Key Technology of Shale Oil Sweet Spot Evaluation and Sweet Spot Type Division in Fengcheng Formation of Mahu Sag

doi: 10.3799/dqkx.2022.333

1.
Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company of PetroChina, Karamay 834000, China
2.
College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

Received Date: 2022-04-22
Available Online: 2023-02-01
Publish Date: 2023-01-25

Abstract

Abstract

Mahu Fengcheng Formation shale oil is a new field of oil and gas exploration in Junggar Basin. Clarifying its high-quality "sweet spot" development section is of great significance to the oil test horizon and the deployment of horizontal wells. Starting with two key geological engineering parameters in shale oil evaluation: free oil and brittleness index, and based on the systematic experimental site, in this paper it studies the logging evaluation method of free oil and brittleness index of shale oil in Mahu Fengcheng Formation, analyzes the influence of the two parameters on production, establishes the calculation model of production potential index, and forms the "sweet spot" classification method. The research shows that: (1) (T₂, T₁) 2D NMR method can effectively distinguish movable water, free oil and adsorbed oil (T₁/T₂: movable water < free oil < adsorbed oil). The porosity of free oil in shale reservoir of Fengcheng Formation is low, mainly 0.5%-3.0%. (2) Shale oil layer has good brittleness, and the brittleness index is more than 70%, but the Young's modulus is large, so it is difficult to start fracturing by hydraulic fracturing. (3) According to the productivity potential index, it is divided into three types of sweet spots. Vertically, the three types of sweet spots are overlapped and developed, and three sets of high-quality sweet spots can be selected. The key technology of shale oil sweet spot evaluation proposed in the research provides an important basis for shale oil testing and layer selection of Fengcheng Formation and target layer selection of horizontal wells. This technical method can provide a reference for shale oil sweet spot evaluation in other continental basins in China.
- Fengcheng Formation,
- shale oil,
- free oil,
- brittleness index,
- sweet spot evaluation,
- geophysics

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References(56)

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Key Technology of Shale Oil Sweet Spot Evaluation and Sweet Spot Type Division in Fengcheng Formation of Mahu Sag

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