渤海湾盆地辽东湾坳陷古近系沙一段、沙二段重力流沉积及其油气勘探意义

发布时间：2018-08-24 11:28

【摘要】：针对辽东湾坳陷断拗早期阶段,即沙河街组二段、沙河街组一段沉积时期,岩心中识别出的大量重力流沉积,利用岩心的沉积特征、测录井数据及重力流沉积理论,将该时期重力流沉积划分为浊流沉积、砂质碎屑流沉积、滑动与滑塌沉积三大类。该时期重力流沉积主要发育于三角洲前缘,触发机制为古地震和重力双重作用,主要控制因素为物源供给。结合不同重力流砂体的叠置关系、连井剖面、分布位置及前人研究成果,建立了该时期三角洲前缘重力流发育模式,并将其分为:滑塌根部、斜坡中间和盆地平原3个相带。通过对各类重力流砂体储集层物性的分析可知,分布于斜坡中间部位的砂质碎屑流沉积及近源浊流沉积具有良好的储集条件。综合分析认为:沙二段沉积时期三角洲前缘的重力流砂体规模及厚度较沙一段沉积时期更大,同时具备良好的生、储、盖、运条件,对油气勘探具有重要的意义。
[Abstract]:In view of the early stage of fault depression in Liaodong Bay depression, that is, the second stage of Shahejie formation and the first stage of sedimentary period of Shahejie formation, a large number of gravity flow deposits identified in the cores are used to utilize the sedimentary characteristics of the cores, logging data and the theory of gravity flow deposition. The gravity flow deposits in this period are divided into three types: turbidite deposition, sand clastic flow deposition, sliding and sloughing deposition. In this period, the gravity flow deposits mainly developed in the delta front. The trigger mechanism is the paleoseismicity and gravity, and the main controlling factor is the provenance supply. Combined with the superposition relation of different gravity flowing sand bodies, the profile, distribution position and previous research results of the continuous well, the development model of the delta leading gravity flow in this period is established, and it is divided into three facies zones: the root of the collapse, the middle of the slope and the plain of the basin. Through the analysis of the physical properties of various kinds of gravity flowing sand bodies, it can be seen that there are good reservoir conditions for sand clastic flow deposits and near-source turbidite deposits distributed in the middle part of the slope. The comprehensive analysis shows that the size and thickness of gravity flowing sand body in delta front of the second member of Sha member is larger than that of the first member of sand formation, and it has good conditions of generation, reservoir, cap and migration, which is of great significance for oil and gas exploration.
【作者单位】：成都理工大学沉积地质研究院;成都理工大学油气藏地质及开发工程国家重点实验室;中海石油(中国)有限公司天津分公司;
【基金】：中国地质调查局项目(编号:1212011220762) 中海油天津分公司项目(编号:CCL2013TJXSBS1880)联合资助~~
【分类号】：P618.13

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