塔里木盆地北部三叠系辫状三角洲砂体储集层非均质性研究  

RESERVOIR HETEROGENEITY OF THE TRIASSIC BRAIDED DELTAIC SAND BODY:A CASE STUDY IN AKEKULE-DALIYA AREA, NORTHERN TARIM BASIN

作　　者：张希明[1] 刘青芳[1] 王恕一[2] 

机构地区：[1]地质矿产部西北石油地质局 [2]地质矿产部石油地质中心实验室

出　　处：《石油勘探与开发》1997年第1期50-54,共5页Petroleum Exploration and Development

基　　金："八五"国家重点科技攻关项目!85-101-04-01

摘　　要：运用Miall的构型（Architecture）分析法，以库车河地表剖面三叠系黄山街组中部砂体三维构型为模式，将与之成因类型相似的塔北覆盖区三叠系辫状三角洲砂体划分出不同级别的界面和构型单元，并将其非均质性分为4个级别。A级为区域级非均质性，由六级界面控制，延伸范围十几到几十千米以上，宏观上控制了砂体的分布及规模；B级为亚区域级非均质性，多由五级界面控制，延伸范围几到十几千米，造成同一构造或构造带不同部位油气产能的巨大差异；C级为局部级非均质性，由四级界面控制，延伸范围几十到几百米，为非渗透性及低孔渗构型单元对流体的封隔和阻碍；D级为构型单元内部的小范围非均质性，由三级以下界面控制，延伸范围及厚度不大，与构型单元内部的岩性变化、孔渗变化及成岩作用等因素密切相关。4个级别的非均质性不同程度地对油气富集起着控制作用。The Triassic braided deltaic sand body is one of the important reservoirs in northern Tarim basin, which can be divided intodeltaic front and deltaic plain subfacies in terms of its depositional environment. In light of the study method of 3D architec-ture composed by A. D. Miall, the 3D architecture with same origins in the exposure are studied and a related model is constructed. The Triassic braided deltaic sand body is divided into different levels of interfaces and architecture units. There are4 levels of heterogeneity in the sand body in terms of its characteristics and scale, which in a various degree control the enrich-ment of oil and gas. Due to the low porosity and perrneability of the architecture units bounded by architecture interfaces andthe interfaces themselves result in the fluid block and barrier, there are some differences in hydrocarbon accumulation in there servoirs.

关 键 词：三角洲 砂岩体 储集层 非均质 三叠纪 油气藏 

分 类 号：P618.130.2[天文地球—矿床学]