柴达木盆地英雄岭页岩油CP1井压裂后甜点分析

doi:10.3969/j.issn.1672-7703.2023.04.011

摘要/Abstract

摘要： 2021年柴达木盆地英雄岭CP1井页岩油取得高产突破，但仍需明确初步识别出的两类甜点纹层状灰云质页岩和层状灰云质页岩哪类为优势甜点岩相。从有机质丰度、物性、含油性、压裂后裂缝复杂程度、示踪剂、生产动态等地质、工程多角度对英雄岭页岩油地质、工程甜点岩相进行了系统分析。研究结果表明：（1）英雄岭页岩油地质甜点应选取碳酸盐含量、含油饱和度、TOC等指标表征；工程甜点选择可压裂性指数为关键参数。（2）相较层状灰云质页岩，纹层状灰云质页岩在含油饱和度、水平渗透率、压裂后裂缝复杂程度、渗吸能力、油相流动能力、见油速度等方面均更具优势。（3）纹层状灰云质页岩是英雄岭页岩油地质、工程双甜点。（4）在下干柴沟组上段Ⅳ油组11层（E₃²-Ⅳ-11）勘探开发实践过程中，建议选择3小层（E₃²-Ⅳ-11-3）为目标靶点。

关键词: 英雄岭, 页岩油, 纹层状灰云质页岩, 层状灰云质页岩, 地质甜点, 工程甜点, 示踪剂分析, 甜点识别

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.

中图分类号:

TE357.14

郭得龙, 申颍浩, 林海, 熊廷松, 赵健, 王小琼, 伍坤宇, 赵文凯, 邢浩婷, 张静, 冯昕媛, 肖倩, 赵恩东, 张少斌, 张木杨. 柴达木盆地英雄岭页岩油CP1井压裂后甜点分析[J]. 中国石油勘探, 2023, 28(4): 117-128.

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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