岩性油气藏 ›› 2025, Vol. 37 ›› Issue (1): 170–181.doi: 10.12108/yxyqc.20250115

• 地质勘探 • 上一篇    下一篇

鄂尔多斯盆地延安地区三叠系长7页岩源储配置及油气富集规律

吴佳1,2, 赵卫卫1,2, 刘钰晨1,2, 李慧1,2, 肖颖1,2, 杨迪1,2, 王嘉楠1,2   

  1. 1. 西安石油大学 地球科学与工程学院, 西安 710065;
    2. 西安石油大学陕西省油气成藏地质学重点实验室, 西安 710065
  • 收稿日期:2024-05-23 修回日期:2024-07-13 出版日期:2025-01-01 发布日期:2025-01-04
  • 第一作者:吴佳（1999—），女，西安石油大学在读硕士研究生，研究方向为非常规页岩气勘探。地址：（710065）陕西省西安市雁塔区电子二路东段18号。Email：wj2451385091@163.com。
  • 通信作者: 赵卫卫（1976—），男，博士，副教授，主要从事非常规油气地质与勘探、油气藏成藏机理与分布规律方面的教学与研究工作。Email:zhaoww@xsyu.edu.cn。
  • 基金资助:
    国家科技重大专项“陆相页岩储气机理与储层精细描述研究”（编号：2017ZX05039-001-002）资助。

Shale rock-reservoir collocation and hydrocarbon enrichment rule of Triassic Chang 7 member in Yan’an area，Ordos Basin

WU Jia1,2, ZHAO Weiwei1,2, LIU Yuchen1,2, LI Hui1,2, XIAO Ying1,2, YANG Di1,2, WANG Jianan1,2   

  1. 1. School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China
  • Received:2024-05-23 Revised:2024-07-13 Online:2025-01-01 Published:2025-01-04

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摘要： 鄂尔多斯盆地三叠系长7段陆相页岩油气资源丰富，勘探开发潜力较大。通过岩心观察及测井、录井资料分析，综合地球化学数据、X射线衍射分析及现场解析气体数据等，对鄂尔多斯盆地延安地区三叠系长7段3个亚段页岩的源储特征进行了分析，并对不同源储组合特征及其与油气富集相关性进行了解剖。研究结果表明：①鄂尔多斯盆地延安地区三叠系延长组长7段有机质类型以Ⅱ1型和Ⅱ2型为主，Ⅰ型次之，自上而下3个亚段的总有机碳（TOC）质量分数平均值分别为3.39%，4.35%，5.57%，镜质体反射率（Ro）分别为0.69%，0.97%，1.31%，分别处于低成熟、成熟、高成熟演化阶段，分别为差烃源岩、中等烃源岩、优质烃源岩。②研究区长73亚段泥页岩矿物组分具有富黏土矿物特征，长72亚段黏土矿物含量高于长71亚段，3个亚段的孔隙类型分别以溶蚀孔、粒间孔—溶孔、粒间孔为主，储层可划分为Ⅰ类（优）、Ⅱ类（中）和Ⅲ类（差）。③研究区主要发育优质烃源岩-差储层、中等烃源岩-优质储层、差烃源岩-中等储层、中等烃源岩-中等储层、优质烃源岩-中等储层、差烃源岩-优质储层6种源储配置特征，长73亚段油气富集程度最高，长72亚段次之，长71亚段不利于页岩油气的富集成藏。④高有机质丰度、高有机质成熟度的泥页岩具有较好的生烃潜力，高黏土矿物含量、较好的孔隙连通性有利于油气运移聚集成藏，源储配置特征控制着页岩油气的富集部位。

关键词: 页岩油气, 源储配置特征, 富集规律, 长7段, 延长组, 三叠系, 延安地区, 鄂尔多斯盆地

Abstract: The continental shale of member 7 of Yanchang Formation in Ordos Basin is rich in oil and gas resources and has great potential for exploration and development. Through core observation，well logging and logging data analysis，geochemical data，X-ray diffraction analysis and on-site analytical gas and other specific test data，in-depth analysis of the shale oil and gas source-reservoir characteristics of the three sub-member of Chang 7 member，and establish the source-reservoir division standard，compare and analyze the relationship between different source-reservoir combination characteristics and oil and gas enrichment rules. The results show that：（1）The organic matter types of Chang 7 member of Yanchang Formation of Triassic in Yan’an area of Ordos Basin are mainly type Ⅱ1 and type Ⅱ2，followed by type Ⅰ；the average organic carbon content（TOC） of the three substrata are 3.39%，4.35% and 5.57%，respectively. And value of vitrinite reflectance（Ro）are 0.69%， 0.97% and 1.31%. Chang 71、Chang 72 and Chang 73 sub-members are poorly developed，medium source rocks and high quality source rocks，respectively.（2）The shale mineral composition of Chang 73 sub-member of Yanchang Formation in the study area is rich in clay，and the clay mineral content of Chang 72 sub-member is better than that of Chang 71 sub-member. The pore space types of Chang 71，Chang 72 and Chang 73 sub-members are dissolution pore，intergranular pore-solution pore and intergranular pore fracture，respectively，and the developed reservoir characteristics are type Ⅲ（poor），type Ⅱ（medium）and type Ⅰ（excellent），respectively. （3）Six kinds of source reservoir characteristics are mainly developed in the study area，such as high quality hydrocarbon source rock high quality reservoir，medium hydrocarbon source rock medium reservoir，poor source rock medium reservoir，high quality source rock medium reservoir，poor source rock poor reservoir and so on. The enrichment degree of high quality source rock is the highest，which is mainly distributed in Chang 73 sub-member. The second is medium source rock high-quality reservoir，medium source rock medium reservoir， high-quality source rock medium reservoir，mainly developed in Chang 72 sub-member，Chang 71 sub-member with poor distribution and other poor source rock reservoirs，which is not conducive to shale oil and gas accumulation.（4）Shale with high organic matter abundance and high organic matter maturity has better hydrocarbon generation potential. High clay mineral content and good pore connectivity are conducive to oil and gas migration and accumulation. Source and reservoir characteristics control the enrichment position of shale oil and gas in this area.

Key words: shale oil and gas, shale rock-reservoir collocation characteristics, enrichment rule, Chang 7 member, Yanchang Formation, Triassic, Yan’an area, Ordos Basin

中图分类号: 

  • TE122.1
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