酒泉盆地青西凹陷白垩系页岩油储层特征及含油性评价

李涛; 焦文龙; 杨克荣; 胡鱈茹; 宋杰; 刘国利; 韦德强; 刘欣泽

doi:10.11781/sysydz2025061316

酒泉盆地青西凹陷白垩系页岩油储层特征及含油性评价

doi: 10.11781/sysydz2025061316

1. 中国石油玉门油田分公司, 甘肃酒泉 735019;
2. 中国石油玉门油田分公司勘探开发研究院, 甘肃酒泉 735019

基金项目:

中国石油油气新能源公司科技项目“中小盆地风险勘探领域和目标研究、工程技术攻关及现场试验”(2023YQX10110)资助。

详细信息

作者简介:
李涛(1977—)，男，硕士，高级工程师，主要从事油藏工程综合研究。E-mail：ymlit@petrochina.com.cn。

中图分类号: TE122.2
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出版历程
- 收稿日期: 2025-01-08
- 修回日期: 2025-10-09
- 网络出版日期: 2025-11-26

Reservoir characteristics and oil-bearing evaluation of Cretaceous shale oil in Qingxi Sag, Jiuquan Basin

1. Yumen Oilfield Branch, CNPC, Jiuquan, Gansu 735019, China;
2. Research Institute of Exploration and Development, Yumen Oilfield Branch, CNPC, Jiuquan, Gansu 735019, China

摘要

摘要:
酒泉盆地青西凹陷白垩系发育一系列泥云岩与碎屑岩混合成因的细粒沉积物，有页岩油富集的潜在条件。选取不同岩相样品为研究对象，开展岩石热解、总有机碳、X射线衍射、扫描电镜分析、岩石薄片观察、低温氮气吸附、高压压汞实验等一系列分析测试实验。综合运用矿物岩石学、有机地球化学、储层物性分析等方法，对凹陷页岩油进行储层精细刻画和含油性评价。研究结果表明：①凹陷页岩矿物成分和岩性复杂，岩相类型主要为白云质页岩、粉细砂岩、含砾砂岩和泥岩，对应的页岩油类型属于广义混积型、夹层型。粉细砂岩含油性最好，白云质页岩次之，两者都是页岩油的有利储层；②页岩储层孔径在10 nm～100 μm范围内均有分布，其中粉细砂岩的孔径分布相对较为均匀，有利于页岩油富集。③根据总有机碳(TOC)含量、S₁含量及含油饱和度参数(OSI)对页岩油含油性进行分级评价，可以划分出无效资源、低效资源、中效资源、高效资源。④基于页岩岩相、地球化学特征、储层物性特征、微观孔隙结构及含油性特征，将凹陷页岩油品质从好到差划分为Ⅰ级、Ⅱ级、Ⅲ级甜点。研究明确了青西页岩油的储层和含油性特征，并划分了页岩油甜点，对凹陷页岩油勘探具有重要意义。
- 页岩油 /
- 储集层特征 /
- 含油性评价 /
- 下沟组 /
- 青西凹陷 /
- 酒泉盆地
Abstract:
A series of fine-grained sediments with mixed origins of mudstone-dolomite and clastic rock are developed in the Cretaceous of Qingxi Sag in the Jiuquan Basin, providing favorable conditions for shale oil enrichment. Samples of different lithofacies were selected as research objects, and a series of analytical tests were conducted, including rock pyrolysis, total organic carbon, X-ray diffraction, scanning electron microscope (SEM) analysis, rock thin section observation, low-temperature nitrogen adsorption, and high-pressure mercury intrusion experiments. Through the comprehensive applications of mineral petrology, organic geochemistry, and reservoir physical property analyses, detailed reservoir characterization and oil-bearing evaluation were conducted for shale oil in the sag. The research results showed that:(1) The shale mineral compositions and lithologies in the sag were complex, and the main lithofacies types were dolomitic shale, fine siltstone, gravelly sandstone, and mudstone. The corresponding shale oil types were mixed sedimentation (in a broad sense) and interbedded types. The fine siltstone exhibited the best oil-bearing property, followed by dolomitic shale, and both of them were favorable reservoirs for shale oil. (2) The pore sizes of shale reservoirs were distributed in the range of 10 nm to 100 μm, among which fine siltstone had a relatively uniform pore size distribution, conducive to the enrichment of shale oil. (3) Based on total organic carbon (TOC) content, S₁ content, and oil saturation index (OSI), the oil-bearing properties of shale oil were evaluated and classified into ineffective resources, low-efficiency resources, medium-efficiency resources, and high-efficiency resources. (4) Based on shale lithofacies, geochemical characteristics, reservoir physical property characteristics, microscopic pore structure, and oil-bearing characteristics, the shale oil in the sag was divided into Class Ⅰ, Class Ⅱ, and Class Ⅲ sweet spots, in descending order of resource quality. This study clarified the reservoir and oil-bearing characteristics of the shale oil in the Qingxi Sag and categorized shale oil sweet spots, which is of great significance for shale oil exploration in the sag.
- shale oil /
- reservoir characteristics /
- oil-bearing evaluation /
- Xiagou Formation /
- Qingxi Sag /
- Jiuquan Basin

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