鄂尔多斯盆地延长组长7致密油砂体特征及成因分析  

Analysis of characteristics and genesis of tight oil sands of Yanchang Formation Chang7 reservoirs in Ordos Basin

作　　者：王芳[1,2] 冯胜斌[1,2] 梁晓伟[1,2] 甄静[1,2] 郝炳英[1,2] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院 [2]低渗透油气田勘探开发国家工程实验室

出　　处：《低渗透油气田》2014年第1期1-7,共7页

基　　金：中国石油天然气股份有限公司“鄂尔多斯盆地致密油勘探开发关键技术研究”重大科技专项（2011E-2602）项目资助.

摘　　要：以野外露头调查和岩心观察为基础，综合运用粒度分析和薄片鉴定等分析测试手段，结合湖盆底的形状类型，鄂尔多斯盆地延长组长7致密油砂体沉积特征被分析了。致密油砂体成因类型被划分了。致密油砂体纵向、平面分布特征及控制因素被探讨了。研究结果表明：湖盆中部长7主要发育三种成因类型的致密油砂体，即砂质碎屑流、浊积岩和滑塌岩，其中砂质碎屑流是致密油最主要的储集体。湖盆中部受朵体加水道重力流沉积作用控制．细粒级砂体分布广、厚度大。砂体的形成与分布范围主要受湖盆底形控制，湖盆坡脚及湖底平原是有利的致密油砂体叠合发育区。Based on the outcrop survey and core observation, by integrated use of means of analysis and testing, such as particle size and thin section analysis, and combining with types of the lake basin floor shape, depositional characteristics of tight Chang7 oil sands of Yanchang Formation in Ordos Basin is analyzed. Gcnetie types of tight oil sands are divided. The vertical and horizontal distribution characteristics and their controlling factors of tFle tight oil sands are discussed. Research results show that： there are mainly three kinds of genetic types of tight oil sands developed in the Chang7 rescrvirs in the central lake basin, that is, sandy debris flows, turbidite, and slump rocks. Sandy debris flows are the most important and main reservoir bodies for tight oil＋ Fine-grained sands were widely distributed with large thickness in the central lake-basin that was controlled by the sedimentation of lobes plus waterway gravity flow. The formation and distribution scope of sand bodies are mainly controlled by the lake basin floor shape. The slope foots of the lake-basin and basin floor plains are favorable stacked development areas for tight oil sands.

关 键 词：致密油 砂质碎屑流 砂体成因 湖盆底型 鄂尔多斯盆地 

分 类 号：P618.130.2[天文地球—矿床学]