吉木萨尔凹陷芦草沟组页岩油藏甜点分类

doi:10.7657/XJPG20250201

新疆石油地质 ›› 2025, Vol. 46 ›› Issue (2): 127-135.doi: 10.7657/XJPG20250201

• 油气勘探 • 下一篇

吉木萨尔凹陷芦草沟组页岩油藏甜点分类

齐洪岩^1a^,^2a(), 王振林^1b^,^2a, 张艳宁^2b, 蔺敬旗^1a^,³, 胡旋^2a, 苏静^2a, 徐睿³, 曹志锋³()

1.中国石油大学（北京） a.地球科学学院；b.石油工程学院，北京 102249
2.中国石油新疆油田分公司 a.勘探开发研究院; b.玛湖勘探开发项目部，新疆克拉玛依 834000
3.中国石油集团测井有限公司新疆分公司，新疆克拉玛依 834000

收稿日期:2024-11-20 修回日期:2024-12-22 出版日期:2025-04-01 发布日期:2025-03-26
通讯作者: 曹志锋（1966-），男，江苏泰州人，高级工程师，测井解释与评价，（Tel）0990-6847037（Email）caozfxj@cnpc.com.cn
作者简介:齐洪岩（1983-），男，山东无棣人，高级工程师，博士研究生，非常规资源评价与预测，（Tel）0990-6240223（Email）qhy@petrochina.com.cn
基金资助:
中国石油科技重大专项(2023ZZ15YJ02)

Classification of Sweet Spots in Shale Oil Reservoir of Lucaogou Formation in Jimsar Sag，Jurggar Basin

QI Hongyan^1a^,^2a(), WANG Zhenlin^1b^,^2a, ZHANG Yanning^2b, LIN Jingqi^1a^,³, HU Xuan^2a, SU Jing^2a, XU Rui³, CAO Zhifeng³()

1. China University of Petroleum (Beijing), a. School of Geosciences; b. School of Petroleum Engineering, Beijing 102249, China
2. PetroChina Xinjiang Oilfield Company, a. Research Institute of Exploration and Development; b. Mahu Exploration and Development Project Department, Karamay, Xinjiang 834000, China
3. Xinjiang Branch, China National Logging Corporation, Karamay, Xinjiang 834000, China

Received:2024-11-20 Revised:2024-12-22 Online:2025-04-01 Published:2025-03-26

摘要/Abstract

摘要： 准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油藏自上而下可分为2个甜点，页岩油藏甜点产能差异较大，主要控制因素尚不明确，甜点预测难度较大。利用地质、岩石物理实验、测井、试油等资料，探讨了页岩油富集机理，开展了页岩油藏甜点主控因素研究，构建了页岩油藏甜点指数，建立了甜点分类标准。结果表明：研究区页岩油藏甜点优势储集层岩性为粉细砂岩和砂屑白云岩，优势储集层岩性孔隙结构好，游离油相对丰富，脆性中等；页岩油藏储集层微裂缝的发育、分布和有效性受地层超压的影响；页岩油藏甜点主控因素为游离油饱和度、地层超压和脆性指数；页岩油藏Ⅰ类甜点的甜点指数大于45，Ⅱ类甜点的甜点指数为25~45，Ⅲ类甜点的甜点指数小于25；Ⅰ类和Ⅱ类甜点为水平井开发的黄金靶点，Ⅲ类甜点为后备动用。

关键词: 准噶尔盆地, 吉木萨尔凹陷, 芦草沟组, 页岩油藏, 游离油饱和度, 地层压力系数, 岩石脆性, 甜点分类

Abstract:

The shale oil reservoir of Permian Lucaogou formation in the Jimsar sag of the Junggar Basin can be divided into two sweet spots from top to bottom. These sweet spots vary significantly in productivity and remain unclear for controlling factors, making sweet spot prediction challenging. By using geological, petrophysical experiment, logging, and formation testing data, the enrichment mechanisms of shale oil were identified, the main factors controlling sweet spots in the shale oil reservoir were investigated, sweet spot index was constructed, and a classification standard for sweet spots was established. The research results show that the dominant reservoir rocks in the sweet spots in the study area are silty-fine sandstone and psammitic dolomite, with good pore structure, relatively abundant free oil, and moderate brittleness. The development, distribution, and effectiveness of micro-fractures in the shale oil reservoir are influenced by formation overpressure. The sweet spots in the shale oil reservoir are mainly controlled by free oil saturation, formation overpressure, and brittleness index. The sweet spot index is greater than 45 for Class Ⅰ sweet spots, 25-45 for Class Ⅱ sweet spots, and less than 25 for Class Ⅲ sweet spots. Class Ⅰ and Class Ⅱ sweet spots are considered as prime targets for horizontal wells, while Class Ⅲ sweet spots are reserved for future development.

Key words: Junggar Basin, Jimsar sag, Lucaogou formation, shale oil reservoir, free oil saturation, formation pressure coefficient, rock brittleness, sweet spot classification

中图分类号:

TE122.2

齐洪岩, 王振林, 张艳宁, 蔺敬旗, 胡旋, 苏静, 徐睿, 曹志锋. 吉木萨尔凹陷芦草沟组页岩油藏甜点分类[J]. 新疆石油地质, 2025, 46(2): 127-135.

QI Hongyan, WANG Zhenlin, ZHANG Yanning, LIN Jingqi, HU Xuan, SU Jing, XU Rui, CAO Zhifeng. Classification of Sweet Spots in Shale Oil Reservoir of Lucaogou Formation in Jimsar Sag，Jurggar Basin[J]. Xinjiang Petroleum Geology, 2025, 46(2): 127-135.

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岩性	排驱压力/ MPa	最大孔喉直径/ μm	平均毛细管直径/ μm	直径大于0.148 μm 孔喉占比/%	最大进汞饱和度/%
砂屑白云岩	4.4	1.02	0.32	63.8	80.6
粉细砂岩	3.7	2.48	0.72	61.7	86.6
泥晶白云岩	4.3	0.96	0.28	22.0	83.6
白云质粉砂岩	4.1	0.54	0.18	38.0	80.0

吉木萨尔凹陷芦草沟组页岩油藏甜点分类

Classification of Sweet Spots in Shale Oil Reservoir of Lucaogou Formation in Jimsar Sag，Jurggar Basin

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