石油学报 ›› 2022, Vol. 43 ›› Issue (2): 234-249.DOI: 10.7623/syxb202202006

• 地质勘探 • 上一篇    下一篇

陆相超细粒页岩油储层沉积机制与地质评价

张建国1, 姜在兴1, 刘鹏2, 孔祥鑫1, 葛云锦3   

  1. 1. 中国地质大学(北京)能源学院 北京 100083;
    2. 中国石油化工股份有限公司胜利油田分公司勘探开发研究院 山东东营 257015;
    3. 陕西延长石油(集团)有限责任公司研究院 陕西西安 710075
  • 收稿日期:2021-11-25 修回日期:2021-12-28 发布日期:2022-03-03
  • 通讯作者: 张建国,男,1989年1月生,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,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No.41772090)资助。

Deposition mechanism and geological assessment of continental ultrafine-grained shale oil reservoirs

Zhang Jianguo1, Jiang Zaixing1, Liu Peng2, Kong Xiangxin1, Ge Yunjin3   

  1. 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    2. Research Institute of Petroleum Exploration and Development, Sinopec Shengli Oilfield Company, Shandong Dongying 257015, China;
    3. Research Institute of Shaanxi Yanchang Petroleum(Group) Co., Ltd., Shaanxi Xi'an 710075, China
  • Received:2021-11-25 Revised:2021-12-28 Published:2022-03-03

摘要: 超细粒(粒径<10 μm)沉积储层中蕴含有50%以上的页岩油资源,是页岩油产量二次增长的重要领域,但当前对其成因机制和地质评价方法认识不清,制约了页岩油勘探开发突破。综合利用中国主要陆相页岩油盆地资料,厘定超细粒沉积岩的形成机制,按照其物质来源将超细粒沉积物划分为陆源型、内源型、热液-火山来源型、混合来源型4类,结合沉积动力和物质组分细分为陆源静水沉积型、陆源事件沉积型、内源生物残骸沉积型、内源生物化学沉积型、内源蒸发化学沉积型、火山空落沉积型、水底热液-火山喷发沉积型、混源静水沉积型、混源事件沉积型9种成因类型。系统分析了9类超细粒沉积岩储层特征的差异性,发现不同成因超细粒沉积岩的有机质丰度、含油性、脆性、孔渗性等储层质量参数差异明显,其中,内源生物残骸型和生物化学沉积型、部分热液-火山沉积型和混源静水沉积型超细粒沉积岩为优质页岩油储层,其页岩油储集潜力较大,是超细粒页岩油储层勘探中应重点关注的岩石类型。

关键词: 陆相, 超细粒沉积, 页岩油, 沉积, 储层

Abstract: The shale oil enriched in ultrafine-grained sendimentary rocks (grain size<10μm) account for more than 50% of the total shale oil resources; however, there is still a lack of clear understanding of its genetic mechanism and geological assessment methods, thus restricting the breakthrough in shale oil exploration and development. Therefore, the formation mechanism of ultrafine-grained sedimentary rocks was explored based on analyzing the data of shale oil-rich continental basin; according to the material source of ultrafine-grained sediments, the ultrafine-grained sedimentary rocks were divided into four types dominated by terrestrial source, intra-source, hydrothermal-volcanic source and hybrid source rocks; according to the sedimentary dynamics and material composition, they were further subdivided into nine genetic mechanisms, including terrestrial-sourced still water deposition, terrestrial-sourced event deposition, intra-source dead creature deposition, intra-source biochemistry deposition, intra-source evaporation-chemistry deposition, volcanic deposition, subaqueous hydrothermal-volcanic eruption deposition, hybrid-source still water deposition and hybrid-source event deposition. The ultrafine-grained sedimentary rocks of different genetic mechanisms vary significantly in reservoir quality parameters, such as organic matter abundance, oil content, brittleness and reservoir physical properties. Specifically, the ultrafine-grained sedimentary rocks dominated by intra-source dead creature deposition, intra-source biochemistry deposition, partial hydrothermal-volcanic deposition and hybrid-source still water deposition possess good shale oil reservoir potential, as being the important sweet spots of shale oil exploration.

Key words: continental facies, ultrafine-grained sedimentary rocks, shale oil, deposition, reservoir

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