柴达木盆地东部地区不整合类型和分布规律  

The Unconformity Type and Distribution in Eastern Qaidam Basin

作　　者：赵卫卫[1] 计红[1] 

机构地区：[1]西安石油大学油气资源学院,陕西西安710065

出　　处：《西北地质》2011年第4期97-104,共8页Northwestern Geology

基　　金：国家自然科学基金(No.40772081);中石化西部新区勘探指挥部重点科技攻关项目(2004KY10031);西安石油大学博士启动基金(YS29030504)共同资助

摘　　要：柴达木盆地东部经历了多期次构造运动,形成了多个不整合。在测井曲线分析的基础上,以不整合的成因机制及地震反射特征为基础,将柴达木盆地东部地区不整合划分为褶皱、断褶、削截、超覆和平行5种类型。风化剥蚀程度的不均一性使不整合具有典型的层状结构,将不整合面上、下划分为底砾岩、风化黏土层和半风化淋滤带。构造运动、地势的高低与剥蚀量的大小决定了不整合类型在平面上的分布具有区带性,不同类型的不整合具有不同的控油机制,而不同的不整合剖面类型形成不同的油气成藏模式,其中断褶不整合和褶皱不整合是最有利的控油不整合。Qaidam Basin has undergone many tectonic movements and formed several unconformities.According to the hydrocarbon accumulation of unconformities and their origins and seismic reflection characteristics,the unconformities of East Qaidam Basin can be divided into five kinds：fold unconformity,fault-fold unconformity,truncation unconformity,onlap unconformity and parallel unconformity.The zonal distribution law of unconformity type is decided by the tectonic movements,sea level elevation and denudation.Laminar textures due to uneven weathering and denudation processes are typical of unconformities,and the unconformity surfaces in vertices are divided into three parts including basal conglomerate,weathering clay stone and semi-weathering leached zone.The different types of unconformity show different hydrocarbon accumulation mechanism and hydrocarbon patterns.The fold unconformity and fault-fold unconformity are of most favorable types for hydrocarbon accumulation.

关 键 词：不整合类型 分布规律 油气成藏 柴达木盆地东部地区 

分 类 号：P542[天文地球—构造地质学]