鄂尔多斯盆地东部马家沟组马五1^3段沉积微相研究  

Sedimentary Microfacies Study of Ma5,3 Sub-Member of Majiagou Formation in Eastern Ordos Basin

作　　者：王少飞[1] 闫小雄[1] 黄道军[1] 张道峰[1] 贾亚妮[1] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院

出　　处：《低渗透油气田》2007年第3期35-39,共5页

摘　　要：鄂尔多斯盆地东部马五1^3小段是盆地东部的主要储层和产层之一研究认为盆地东部马五1^3小段沉积环境为潮坪沉积，划分出硬石膏结核白云坪、含硬石膏白云岩坪和白云岩坪三种沉积微相，提出向东开口的潮坪沉积模式，沉积相带呈环状弧形展布，自西向东硬石膏结核含量向东逐步减少，含盐度降低，海水变得更开阔。沉积微相变化导致的岩性差异是造成储集层非均质性的基本因素，硬石膏结核白云岩坪是最有利的沉积微相，含硬石膏结核白云岩坪次之马五1^3小段沉积模式对盆地东部特别是岩溶残丘勘探具有一定的指导意义.Ma51^3 Sub-Member in eastem Ordos basin is one of the main reservoirs and payzones. It is considered through research that the sedimentary environment of Ma51^3 Sub-Member in eastem Ordos basin is tidal flat. Three microfacies are marked off as anhydrite nodule dolomite flat, anhydrite-bearing dolomite flat, and dolomite flat. We put forward an eastward uncorked tidal flat depositional model. Sedimentary facies belts are distributed like a ring or an arc. From west to east anhydrite nodules contents gradually reduce, with salinity decreased, and the seawater became more open. Differences in lithology caused by sedimentary microfacies variation is the basic factor of reservoir heterogeneity. Anhydrite nodule dolomite flat is the most favorable sedimentary microfacies, with anhydrite nodule-bearing dolomite flat as the second.

关 键 词：鄂尔多斯 沉积微相 硬石膏白云岩坪 有利沉积相带 

分 类 号：TE121[石油与天然气工程—油气勘探] P618.130.2[天文地球—矿床学]