ML地区长8_1油层组优势砂体展布预测及地质意义  

Dominant sand body distribution and geologic sinificance of Chang8_1 formation of ML area

作　　者：李卫成[1,2] 牛小兵[1,2] 梁晓伟[1,2] 张艳梅[1,2] 冯胜斌[1,2] 马继业[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,陕西西安710018 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018

出　　处：《东北石油大学学报》2014年第2期51-57,8,共7页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2011ZX05044)

摘　　要：针对ML地区长81油层组砂体横向连续性差、纵向变化快、延伸方向预测困难等问题，根据沉积旋回将长81油层组细分为3个小层，选择小层内砂体连续厚度大、曲线幅度高的优势砂体作为研究对象，进行砂体展布精细预测。结果表明：地区共发育9支砂带，其中3支来自西部物源，其他来自西南部物源，单支砂带宽度一般为1～2km，砂体交汇处可达4～5km，砂带主体平均厚度为7～9m。不同时期各支砂带的分布范围和砂体规模不同，研究区东部砂厚大于4m的区域是勘探开发的有利区带，长81^3小层有利区面积最大。研究结果克服根据累计厚度进行砂体展布预测而放大有效砂层厚度、因沉积旋回的不对应而扩大砂体分布范围的不足，提高砂体预测的准确性；提供西部物源存在的重要证据，并落实了油藏规模；根据研究成果进行井位部署，目的层可直接精确到优势砂体有利区内，降低勘探部署风险。Aimed at the problem that the sand body of Chang81formation in the ML area has inferior lateral continuity,various changes in vertical,and its extended direction is predicted difficultly,Chang81formation is divided into three small units and the dominant sand body that is the biggest continuous thickness and high extent of well logging curves in the small unit is chose as the research target to predict the planar distribution subtly in order to enhance the veracity by decreasing the shortages that the accumulative thickness of sandbody can increase effective thickness and that different sandbodys connection can expand distribution area.The result indicates that there are nine branches of sand strips,with the two from the west provenance as the same time the others from the west-south provenance,and the simple sand strip is about 1~2km wide,while the width of the converging area is 4~5km and the average thickness of main sandbody is 7~9km,and every strip is different extent and dimension in different periods and the zone whose sand thickness is beyond 4meter is advantageous area,of which Chang831is the most biggest.The result offers the proof of the west provenance and confirm the reservoir size and the deploying purpose formation is aimed directly at the dominant sand body to decrease the risk.

关 键 词：小层划分 优势砂体 砂体展布 井位部署 ML地区 

分 类 号：TE122.2[石油与天然气工程—油气勘探]