东营凹陷沙四上亚段陆相页岩岩相特征、成因及演化

发布时间：2018-03-21 17:23

本文选题：陆相盆地　切入点：页岩　出处：《地球科学》2017年07期 　论文类型：期刊论文

【摘要】：我国陆相湖盆页岩具有较大的生烃潜力,但是对其研究起步较晚,目前存在诸多不足,尤其对富生烃页岩岩相特征及其沉积作用过程、成因演化等方面的研究工作均处于探索阶段.综合岩心、薄片、XRD矿物含量分析、主微量元素和测井等数据,在沉积学、元素地球化学以及T-R(湖进-湖退)层序理论的指导下,详细研究了东营凹陷沙四上亚段页岩的岩相特征及其沉积过程、岩相发育与层序耦合关系以及古气候和湖泊的演化过程.结果表明,沙四上亚段页岩自下而上主要由硬石膏薄夹层页岩相、含粉砂富粘土质页岩相、块状灰质页岩相和纹层状灰质页岩相组成,分别沉积于盐湖环境、前三角洲环境、浅湖环境和深湖-半深湖环境.页岩岩相组合的垂向演化与体系域的纵向分布具有明显的耦合关系,揭示了古气候由干旱转为潮湿、湖盆由小型湖泊演化为大型湖泊,并推断古气候的变化和控盆正断层的活动是控制研究区古湖泊演化的两个重要因素.
[Abstract]:The continental lacustrine basin shale in China has great hydrocarbon generation potential, but its research started late, and there are many shortcomings at present, especially for the facies characteristics and sedimentary process of hydrocarbon rich shale. The research work on genetic evolution is still in the exploratory stage. Comprehensive core, X-ray diffraction (XRD) mineral content analysis, main trace elements and logging data, under the guidance of sedimentology, element geochemistry and T-R sequence theory, In this paper, the lithofacies characteristics and sedimentary process of shales in the upper member of Sha 4 in Dongying sag are studied in detail. The relationship between lithofacies development and sequence coupling, paleoclimate and lake evolution are studied in detail. From the bottom to the top of the upper submember of Sha 4, the shale is mainly composed of anhydrite thin intercalated shale facies, silty sand rich clay shale facies, massive lime-shale facies and lamellar lime-shale facies, which are deposited in salt lake environment and pre-delta environment, respectively. The vertical evolution of shale facies assemblage has obvious coupling with the longitudinal distribution of system tracts, which reveals that the paleoclimate changed from drought to humidity, and the lake basin evolved from small lake to large lake. It is inferred that the paleoclimate change and the normal fault activity are two important factors controlling the evolution of paleolake in the study area.
【作者单位】：中国地质大学构造与油气资源教育部重点实验室;中国地质大学资源学院;中国地质大学海洋学院;中国石化胜利油田分公司地质科学研究院;
【基金】：国家重点基础研究发展计划(“973”计划)项目(No.SQ2013CB021013) 国家十三五科技重大专项《中国典型盆地陆相页岩油勘探开发选区与目标评价》子课题四《济阳坳陷页岩油勘探开发目标评价》(No.2017ZX05049004) “构造与油气资源”教育部重点实验室开放研究基金课题(No.TPR-2016-09)
【分类号】：P618.13

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