特种油气藏 ›› 2025, Vol. 32 ›› Issue (2): 12-21.DOI: 10.3969/j.issn.1006-6535.2025.02.002

• 地质勘探 • 上一篇    下一篇

济阳坳陷始新统页岩岩相组合类型及分布特征

王勇1,2, 刘惠民1,2, 孟伟1, 魏晓亮1, 张顺1,2   

  1. 1.中国石化胜利油田分公司,山东 东营 257015;
    2.页岩油气富集机理与高效开发全国重点实验室,山东 东营 257015
  • 收稿日期:2024-05-08 修回日期:2025-01-20 出版日期:2025-04-25 发布日期:2025-06-16
  • 作者简介:王勇(1977—),男,高级工程师,2002年毕业于湖南科技大学地质勘查专业,2008年毕业于中国科学研究院广州地球化学研究所构造地质学专业,获博士学位,现主要从事油气勘探研究工作。
  • 基金资助:
    国家科技重大专项“渤海湾超级盆地油气富集规律与新领域勘探关键技术”(2024ZD1400100);中国石化科技攻关项目“济阳坳陷页岩油富集高产地质控制因素及目标评价”(P23048)

Types of lithofacies combination and distribution characteristics of the Eocene series shale in the Jiyang Depression

WANG Yong1,2, LIU Huimin1,2, MENG Wei1, WEI Xiaoliang1, ZHANG Shun1,2   

  1. 1. Sinopec Shengli Oilfield Company, Dongying, Shandong 257015, China;
    2. National Key Laboratory of Shale Oil and Gas Enrichment Mechanism and Efficient Development, Dongying, Shandong 257015, China
  • Received:2024-05-08 Revised:2025-01-20 Online:2025-04-25 Published:2025-06-16

摘要: 针对陆相断陷盆地页岩岩相多、相变快、预测难度大的问题,以济阳坳陷始新统沙四上亚段—沙三下亚段页岩为例,综合运用岩心、薄片和地球化学等资料,剖析了页岩岩相组合类型、沉积序列及展布规律。结果表明:研究区主要发育内源型、混源型和外源型3大类岩相组合,其中,内源型岩相组合主要形成于浅湖—半深湖、水体盐度高、外部碎屑物源供给较少的沉积环境;混源型岩相组合主要形成于半深湖—深湖、水体盐度相对较高、内外物源供给相对平衡的沉积环境;外源型岩相组合主要形成于淡水—微咸水、外部物源供给充足的沉积环境;总体上,古气候和古水介质协同演化控制页岩岩相组合的纵向演化,古地貌和古物源协同演化控制页岩岩相组合的分带分区性,沉积环境的环带状协同演化控制岩相组合的平面上环带状发育。页岩岩相组合可作为勘探部署的基本单元。该研究成果对页岩油勘探具有重要指导意义。

关键词: 岩相组合, 沉积环境, 古水介质, 古地貌, 古物源, 陆相断陷盆地, 济阳坳陷

Abstract: In response to the issues of numerous shale facies, rapid facies changes and high predictability in continental faulted basins, a comprehensive analysis was conducted on the combination types, sedimentary sequences and distribution patterns of shale facies by integrating data from cores, thin sections and geochemistry by taking the shale from the upper sub-member of the Member 4 to the lower sub-member of the Member 3 of the Shahejie Formation in Eocene series in the Jiyang Depression as an example.The results show that three major types of lithofacies combinations, namely endogenous, mixed-source and exogenous are predominantly developed in the study area. The endogenous lithofacies combination is primarily formed in a sedimentary environment of shallow to semi-deep lake settings with high salinity of water bodies and limited supply of external clastic material sources. The mixed-source lithofacies combination is mainly formed in a sedimentary environment of semi-deep to deep lake settings with relatively high salinity and relatively balanced internal and external material supply. The exogenous lithofacies combination is predominantly formed in a sedimentary environment of freshwater to brackish water with an ample supply of external material sources. Overall, the co-evolution of paleoclimate and paleowater medium controls the vertical evolution of shale lithofacies combinations, while the joint evolution of paleotopography and paleosource controls the zonal and regional distribution of shale lithofacies combinations. The annular co-evolution of the sedimentary environment controls the annular development of lithofacies combinations on the plane. As the basic unit of exploration deployment, the research findings on shale lithofacies combinations have significant guiding significance for shale oil exploration.

Key words: lithofacies combination, sedimentary environment, paleowater medium, paleotopography, paleosource, continental faulted basin, Jiyang Depression

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