西藏南部低分水岭盆地盖层发育特征与评价  

THE FEATURE AND EVALUATION OF COVER ROCKS IN THE DIFENSHUILING BASIN IN SOUTH TIBET

作　　者：王进军[1,2] 李亚林[3] 陶晓风[1] 张瑞军[1] 

机构地区：[1]成都理工大学地科院,四川成都610059 [2]西藏金海矿产资源有限公司,西藏拉萨850000 [3]中国地质大学,北京100083

出　　处：《新疆地质》2010年第1期77-80,共4页Xinjiang Geology

基　　金：<惩香错-吉隆石油地质走廊大剖面综合调查>(科油[2005]012号);矿物学;岩石学;矿床学国家重点(培育)学科建设项目(SZD0407)项目资助

摘　　要：鉴于西藏高原油气藏具良好生储层,保存难度较大,本次工作目的是探讨低分水岭盆地盖层特征与油气保存关系.通过测试可能盖层的物性参数,分析盖层的孔隙度、渗透率、突破压力,结合经验参数和可能盖层的横向展布、真实厚度,及后期构造作用,客观评价盆地盖层特征.结果显示本区各地层中都存在可能盖层,不同岩性、不同层位、不同厚度的盖层表现出封闭能力不同,这可能与后期构造作用有关.低分水岭盆地中多为有利-较好盖层,其中碳酸盐盖层比页岩好.Although there are favorable source-reservoir the in the tibetan oil-gas reservoir, conservation is greatly difficult. In this paper we study on relation between cover rock features and oil-gas preservation in the Difenshuiling basin. By analysis on cover porosity,permeability, breakthrough pressure and consulting experience, extended distributing, thickness, late tectonic effect,we rightly evaluate feature of cover rocks.Studying result shows exist probable cover rocks in the different stratum. Different lithology, differem stratum,different thick cover rocks have different sealing capability; There are many favorable-common cover rocks and carbonate cover rock is better than shale＇s.

关 键 词：低分水岭盆地 物性参数 横向展布 厚度 封闭能力 

分 类 号：P618.130.21[天文地球—矿床学]