Shale oil resource assessment methods, parameter standards and typical case studies

doi:10.3969/j.issn.1672-7703.2022.05.003

Abstract

Abstract: Given the strong heterogeneity of continental shales in China, small element volumetric method should be adopted for resource assessment of interlayer shale oil and small element volume method for pure shale oil. The fitting relationship curve between S₁ and TOC as well as relationship curve between light hydrocarbon recovery coefficient and R_o are established to obtain the original S₁ content. In addition,four key parameters for the evaluation of pure shale oil resources (S₁, TOC, R_o and shale thickness) and another three for interlayer shale oil resources (cumulative thickness of shale interlayer, porosity and oil saturation) are determined, and the lower limits of these parameters are formulated accordingly. By applying the unified assessment method and standard, typical cases of shale oil resource assessment are studied,including the Cretaceous Qingshankou Formation in the northern Songliao Basin, Triassic Yanchang Formation in Ordos Basin, and Permian Lucaogou Formation in Junggar Basin. The evaluation results show that the geological resources of pure shale oil in the first member of Qingshankou Formation (Qing 1 member) are 52.23×10⁸ t, with light oil (R_o>1.2%) of 11.18×10⁸ t; The total shale oil resources in the third sub member of the seventh member of Yanchang Formation (Chang 7₃ sub member) are 66.80×10⁸ t, among which the interlayer shale oil resources are 27.73×10⁸ t, and the pure shale oil resources are 39.07×10⁸ t; The total shale oil resources in Lucaogou Formation are 15.62×10⁸ t, among which the interlayer shale oil resources are 11.99×10⁸ t, and the pure shale oil resources are 3.63×10⁸ t.

CLC Number:

TE16

Guo Qiulin, Bai Xuefeng, He Wenjun, Fan Liyong, Wang Jian, Jiang Wenya, Liu-Zhuang Xiaoxue, Chen Ningsheng. Shale oil resource assessment methods, parameter standards and typical case studies[J]. China Petroleum Exploration, 2022, 27(5): 27-41.

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