渤海湾盆地沾化凹陷沙河街组三段下亚段细粒沉积岩岩相特征与沉积演化

doi:10.7623/syxb202103003

石油学报 ›› 2021, Vol. 42 ›› Issue (3): 293-306.DOI: 10.7623/syxb202103003

渤海湾盆地沾化凹陷沙河街组三段下亚段细粒沉积岩岩相特征与沉积演化

张建国^1,2, 姜在兴¹, 刘立安³, 袁方⁴, 冯路尧¹, 李长昇¹

1. 中国地质大学(北京)能源学院北京 100083;
2. 自然资源部页岩气资源战略评价重点实验室北京 100083;
3. 东北大学秦皇岛分校资源与材料学院河北秦皇岛 066004;
4. 中国石油长庆油田公司第九采油厂地质研究所宁夏银川 750006

收稿日期:2020-03-20 修回日期:2021-01-13 出版日期:2021-03-25 发布日期:2021-04-09
通讯作者: 张建国,男,1989年1月生,2011年获中国石油大学(北京)学士学位,2017年获中国地质大学(北京)博士学位,现为中国地质大学(北京)副教授、博士生导师,主要从事含油气细粒沉积学及页岩储层的研究工作。
作者简介:张建国,男,1989年1月生,2011年获中国石油大学(北京)学士学位,2017年获中国地质大学(北京)博士学位,现为中国地质大学(北京)副教授、博士生导师,主要从事含油气细粒沉积学及页岩储层的研究工作。Email:zhjianguo@cugb.edu.cn
基金资助:
国家自然科学基金项目（No.41802130）和国家科技重大专项（2017ZX05009-02）资助。

Lithofacies and depositional evolution of fine-grained sedimentary rocks in the lower submember of the Member 3 of Shahejie Formation in Zhanhua sag, Bohai Bay Basin

Zhang Jianguo^1,2, Jiang Zaixing¹, Liu Li'an³, Yuan Fang⁴, Feng Luyao¹, Li Changsheng¹

1. College of Energy Resources, China University of Geosciences, Beijing 100083, China;
2. Key Laboratory of Strategy Evaluation for Shale Gas, Ministry of Natural Resources, Beijing 100083, China;
3. College of Resources and Materials, Northeastern University at Qinhuangdao, Hebei Qinhuangdao 066004, China;
4. Geological Institute of No. 9 Oil Production Plant, PetroChina Changqing Oilfield Company, Ningxia Yinchuan 750006, China

Received:2020-03-20 Revised:2021-01-13 Online:2021-03-25 Published:2021-04-09

摘要/Abstract

摘要： 渤海湾盆地沾化凹陷沙河街组三段（沙三段）下亚段页岩油勘探潜力巨大，目前对其岩相类型及其分布规律、沉积背景认识不清，制约了页岩油的勘探突破。利用岩心和X射线衍射、元素地球化学、有机地球化学等高精度测试资料，通过识别细粒沉积岩的岩相类型，恢复了古沉积环境，并探讨了沉积环境演变约束下的岩相分布规律。沉积古环境的变化控制了不同岩相类型的垂向分布及演化。沾化凹陷沙三段下亚段沉积环境自下而上划分为5个演化阶段，分别发育沉积藻灰岩、纹层状泥灰岩、纹层状重结晶灰岩、纹层状灰质泥岩和块状灰质泥岩。阶段Ⅰ—阶段Ⅲ，古气候相对干旱，陆源输入作用弱，沉积物以湖盆自生的灰岩为主，湖盆水体深度和盐度的变化控制了不同灰岩的变化；阶段Ⅳ，古气候转为湿热，陆源输入作用增强，沉积了陆源成因具年纹层构造的纹层状灰质泥岩；阶段Ⅴ，古气候最为湿热，陆源输入作用最强，发育大量浊流成因的块状灰质泥岩。垂向上，纹层状灰质泥岩的TOC含量最高、含油性最好。研究认识可为进一步厘清沾化凹陷沙三段细粒沉积岩储层非均质性的形成机制和页岩油甜点预测提供理论支撑。

关键词: 沾化凹陷, 细粒沉积岩, 岩相, 沉积环境, 页岩油

Abstract: Shale oil in the lower submember of the Member 3 of Shahejie Formation in Zhanhua sag of Bohai Bay Basin has huge exploration potential. At present, there is less understanding of its lithofacies type, distribution law, and sedimentary background, which restricts the breakthrough in shale oil exploration in this area. Using high-precision test data such as core and X-ray diffraction, elementary geochemistry, organic geochemistry, this paper identifies the lithofacies types of fine-grained sedimentary rocks, restores the sedimentary environment, and explores the distribution law of lithofacies in the evolution process of depositional environment. The vertical distribution and evolution of different lithofacies types is controlled by changes in the sedimentary environment. The evolution of the sedimentary environment of the lower submember of Member 3 of Shahejie Formation in Zhanhua sag is divided into five stages from bottom to top, with the deposition of algal limestone, laminar marlstone, laminar sparite, laminar lime mudstone and massive lime mudstone, respectively. In the stages Ⅰ to stage Ⅲ, the climate was relatively arid, the terrestrial input was weak, authigenic limestone deposits in the lake basin was mainly developed; changes in the water depth and salinity of the lake basin controlled the variations in different limestone lithofacies. In the stage Ⅳ, the climate became hot and humid, the terrestrial input was enhanced, and the laminar lime mudstone originated from terrigenous annual layers was deposited. In the stage Ⅴ, the climate was the hottest and dampest, when the terrestrial input was strongest, and a large number of massive lime mudstones formed by turbidity current were developed. Vertically, the laminar lime mudstone has the highest TOC content and the optimal oiliness. The research results can provide a theoretical support for further clarifying the difference mechanism of the heterogeneity of fine-grained sedimentary rock reservoirs, and predicting the sweet spots of shale oil in the study area.

Key words: Zhanhua sag, fine-grained sedimentary rocks, lithofacies, depositional environment, shale oil

中图分类号:

TE121.3

张建国, 姜在兴, 刘立安, 袁方, 冯路尧, 李长昇. 渤海湾盆地沾化凹陷沙河街组三段下亚段细粒沉积岩岩相特征与沉积演化[J]. 石油学报, 2021, 42(3): 293-306.

Zhang Jianguo, Jiang Zaixing, Liu Li'an, Yuan Fang, Feng Luyao, Li Changsheng. Lithofacies and depositional evolution of fine-grained sedimentary rocks in the lower submember of the Member 3 of Shahejie Formation in Zhanhua sag, Bohai Bay Basin[J]. Acta Petrolei Sinica, 2021, 42(3): 293-306.

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渤海湾盆地沾化凹陷沙河街组三段下亚段细粒沉积岩岩相特征与沉积演化

Lithofacies and depositional evolution of fine-grained sedimentary rocks in the lower submember of the Member 3 of Shahejie Formation in Zhanhua sag, Bohai Bay Basin

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