湖泊水位对三角洲前缘主要砂体类型的影响:以鄂尔多斯盆地神木地区侏罗系延安组剖面为例

发布时间：2018-05-03 12:39

本文选题：鄂尔多斯盆地 + 浅水三角洲　；参考：《古地理学报》2016年06期

【摘要】：通过露头剖面研究,能够从二维或三维角度直观地了解沉积实体物质组成、结构构造及岩层间接触关系等地质信息,对于三角洲砂体展布规律预测以及地下储集层地质模型的建立具有重要意义。本文以鄂尔多斯盆地神木地区侏罗系延安组湖相浅水三角洲露头剖面为例,在沉积微相的研究基础上,主要针对水下分流河道、河口砂坝、席状砂等微相,统计单砂体宽度及厚度,分析砂体间接触关系,总结砂体展布规律。研究认为,对于席状砂、水下分流河道两类砂体而言,与湖泊低水位期相比,高水位期砂体宽厚比较大;在湖泊水位一定的条件下,随着距物源变远,A/S值增加,砂体宽厚比增大。受湖泊水位及距物源远近不同A/S值影响,剖面中发育拼接式、切叠式和孤立式3种砂体叠置样式,从拼接式向孤立式A/S值变大,砂体间连通性变差。
[Abstract]:Through the study of outcrop profile, geological information such as material composition, structural structure and contact relationship between strata can be intuitively understood from 2D or 3D angle. It is of great significance for the prediction of the distribution of delta sand bodies and the establishment of geological model of underground reservoir. Taking the shallow water delta outcrop section of Jurassic Yanan formation in Shenmu area, Ordos Basin as an example, based on the study of sedimentary microfacies, the microfacies of underwater distributary channel, estuarine bar, sheet sand, etc. The width and thickness of single sand body are counted, the contact relationship between sand bodies is analyzed, and the distribution rule of sand body is summarized. It is considered that, for sheet sand and underwater distributary channel, the sand-body width and thickness in high water level period are larger than those in lake low water level period, and the A / S value increases with the distance between the source and the lake water level. The ratio of width to thickness of sand body increases. Influenced by the water level of the lake and the different values of A / S from the source of the lake, there are three types of sand bodies in the section: splicing type, tangent type and isolated type. The values of A / S from splicing type to isolated type become larger, and the connectivity between sand bodies becomes poor.
【作者单位】：中国石油大学(华东)地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;中国石油大港油田公司勘探开发研究院;中国石化无锡石油地质研究所;中国石化胜利油田分公司勘探开发研究院;
【基金】：国家科技重大专项(编号:2011ZX05009-002) 中国石油大学(华东)研究生创新工程资助项目(编号:YCXJ2016010)联合资助~~
【分类号】：P534.52

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