鄂尔多斯盆地环江地区长8储层沉积微相特征及油气富集规律研究  

SEDIMENTARY MICROFACIES CHARACTERISTICS AND HYDROCARBON ACCUMULATION REGULARITY OF CHANG 8 SANDSTONE IN HUANJIANG AREA,ORDOS BASIN

作　　者：高伟[1] 孙佳才 张同伍 段鹏辉[1] 雷宇田 韩詹 

机构地区：[1]中国石油长庆油田分公司油气工艺研究院 [2]中国石油长庆油田分公司第二采气厂 [3]中国石油长庆油田分公司超低渗透油藏第一项目部

出　　处：《天然气勘探与开发》2014年第2期15-18,6-7,共4页Natural Gas Exploration and Development

摘　　要：依据野外露头、岩心、测井及相关测试资料,对鄂尔多斯盆地环江地区长8沉积微相类型、特征及其与油气富集规律的关系的研究表明,环江地区长8储层属三角洲前缘亚相沉积,进一步可分为水下分流河道、河口坝、水下分流间湾、水下天然堤及远砂坝等沉积微相。对各微相及砂体的时空展布特征进行了分析。油气的富集受沉积微相的控制,三角洲前缘亚相中的水下分流河道空间展布范围广,砂体厚度大,具有良好的储集条件;上覆厚层状深湖相泥岩及油页岩,不仅是优质的生油层,更是区域良好的盖层。长8砂体成藏条件优越,是研究区下一步油气开发的主要方向。For Chang 8 Sandstone in Huanjiang area, Ordos Basin, the study on its sedimentary microfacies characteristics and hydrocarbon accumulation regularity was implemented on the basis of some data from outcrop ob-servation, core analysis, and well logging. Results show that this formation belongs to deltaic front subfacies deposit,and can be subdivided into some sedimentary microfacies, including underwater distributary channel, mouth bar, un-derwater interdistributary estuary, underwater natural barrier, and distal bar. After the analysis on microfacies and sandbody distribution, it is found that(1) hydrocarbon accumulation is affected by sedimentary microfacies;(2) in deltaic front subfacies, the underwater distributary channel with large thickness of sandbody has a widely spatial exten-sion, resulting in a better reservoir condition;(2) the overlying, thick-bedded, and deep lacustrine mudstone and oil shale are not only high-quality source bed but also better regional caprock; and(3) Chang 8 Sandstone, with some bet-ter reservoir-forming conditions, is the main target for further development.

关 键 词：沉积微相 长8 环江地区 鄂尔多斯盆地 

分 类 号：P618.13[天文地球—矿床学]