东营凹陷沙三中亚段湖底扇重力流砂岩成岩演化进程及差异分布  

Diagenetic evolution process and differential distribution of gravity flow sandstones in sublacustrine fan in the middle sub-member of the 3rd member,Shashejie Formation in Dongying Sag

作　　者：王俊杰 丁祖鹏 张雨晴 吴胜和[2] WANG Junjie;DING Zupeng;ZHANG Yuqing;WU Shenghe(CNOOC Research Institute Company Limited,Beijing 100029,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中海油研究总院有限责任公司,北京100029 [2]中国石油大学(北京)地球科学学院,北京102249

出　　处：《中国石油大学学报(自然科学版)》2025年第1期44-58,共15页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项(2017ZX05009001)。

摘　　要：通过铸体薄片观察、阴极发光薄片观察、流体包裹体测温等方法,对东营凹陷史深100地区沙三中亚段湖底扇重力流砂岩储层的成岩演化进程进行研究,并分析不同成岩演化进程的差异分布。结果表明:研究区湖底扇重力流砂岩储层质量差异显著,经历了强烈的压实作用、多种类型的胶结作用以及溶蚀作用,整体处于中成岩阶段A_(2)期;在研究区同一湖底扇内部,成岩作用主要受控于沉积因素,主要体现在颗粒组构、杂基含量及砂泥岩界面对成岩作用的控制;不同岩石类型及砂体的不同部位发育不同的成岩演化序列,最终形成不同的储层质量;其中远离砂泥岩界面的主水道和支水道砂体经历中等强度的压实、较弱的碳酸盐胶结和较强的溶蚀作用,形成研究区储层质量最好的优质储层。The diagenetic evolution of sublacustrine fan gravity flow sandstone reservoirs in the middle sub-member of the 3rd member of Shahejie Formation in Shishen 100 area of Dongying Sag was investigated through methods such as casting thin section observation,cathodoluminescence thin section analysis,fluid inclusion temperature measurements,and an analysis of the spatial distribution of diagenetic processes.The results reveal significant variations in reservoir quality of the sublacustrine fan gravity flow sandstone reservoirs within the study area.These reservoirs have undergone intense compaction,diverse cementation types,and dissolution processes,placing them in the middle diagenetic stage A_(2).Within the same sublacustrine fan,diagenesis is primarily controlled by sedimentary factors,including grain fabric,matrix content,and the proximity to the sand-mudstone interface.Different rock types and sandbody segments exhibit distinct diagenetic evolution sequences,leading to variability in reservoir quality.Notably,the main and branch channel sandbodies located far from the sand-mudstone interface experienced moderate compaction,weak carbonate cementation,and strong dissolution,facilitating the development of high-quality reservoirs with the best reservoir quality within the study area.

关 键 词：东营凹陷 沙河街组 湖底扇 重力流砂岩 成岩非均质 

分 类 号：P618.130[天文地球—矿床学]