Post fracturing shale oil sweet spot evaluation in Well CP1 in Yingxiongling area, Qaidam Basin

doi:10.3969/j.issn.1672-7703.2023.04.011

Abstract

Abstract: In 2021, breakthrough of high-yield shale oil production was achieved in Well CP1 in Yingxiongling area in Qaidam Basin. However, it is still necessary to determine the dominant sweet spot lithofacies between the two preliminarily identified sweet spots, i.e., laminated limy-dolomitic shale and layered limy-dolomitic shale. The geological and engineering sweet spot lithofacies of shale oil in Yingxiongling area are systematically analyzed from the perspectives of organic matter abundance, physical properties, oil-bearing property, fracture complexity after fracturing, tracer, and production performance. The results show that: (1) The indicators characterizing the geological sweet spots of Yingxiongling shale oil include carbonate content, oil saturation, and TOC, while the fracability is a key parameter to characterize the engineering sweet spots. (2) Compared with the layered limy-dolomitic shale, the laminated limy-dolomitic shale has advantages of oil saturation, horizontal permeability, fracture complexity, imbibition ability, oil phase flow ability, and oil breakthrough rate. (3) The laminated limy-dolomitic shale is geological and engineering sweet spots in Yingxiongling area. (4) In practice, it is suggested that the No.3 thin layer of the No.11 layer in the IV oil group of the upper part in Lower Ganchaigou Formation (E32-Ⅳ-11-3) is targeted for shale oil exploration and development.

CLC Number:

TE357.14

Guo Delong, Shen Yinghao, Lin Hai, Xiong Tingsong, Zhao Jian, Wang Xiaoqiong, Wu Kunyu, Zhao Wenkai, Xing Haoting, Zhang Jing, Feng Xiyuan, Xiao Qian, Zhao Endong, Zhang Shaobin, Zhang Muyang. Post fracturing shale oil sweet spot evaluation in Well CP1 in Yingxiongling area, Qaidam Basin[J]. China Petroleum Exploration, 2023, 28(4): 117-128.

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