塔里木盆地库车坳陷盐构造成因机制探讨  

THE MECHANICS OF SALT TECTONICS IN KUCHE DEPRESSION, TARIM BASIN

作　　者：邬光辉[1] 蔡振中[1] 赵宽志[1] 董立胜[1] 师骏[1] 

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《新疆地质》2006年第2期182-186,共5页Xinjiang Geology

基　　金："十五"国家重点科技攻关(2004BA616A02)资助

摘　　要：以盐构造解析的方法,综合地震与地质资料分析,在盐构造成因要素剖析的基础上探讨库车坳陷盐构造动力学特征.研究表明库车坳陷盐构造的成因受多重作用影响,差异负载是库车坳陷盐构造初始形成时的动力来源,中新世—上新世中晚期差异负载作用是盐构造形成与缓慢生长的主要动力.盐上盖层快速沉降是该期盐构造生长缓慢的主要原因.上新世中晚期以来强烈的区域挤压作用是库车坳陷盐构造发育的主控因素,构造挤压决定了盐构造的样式、分布与规模,并促进了差异负载、重力作用与浮力作用的发展,以区域挤压为主的多种作用因素造成了库车坳陷盐构造晚期异常高速的生长.This paper describes the halokinesis of the salt tectonics of Kucha Depression with the analysis of seismic and geological data. The salt structures were initiated by differential loading but not buoyancy, and it is the main mechanism of the salt structures growing slowly and stably from Miocene to middle-late Pfiocene. The quick subsidence of the overburden strata above salt and gypsum layers is the main causes of the slow growth of salt structures before middle Pliocene. The violent regional contraction forces plays the most important role in the development of the salt structures, and determines the styles, distribution and scales of the salt structures in Kuche Depression. Regional contraction forces act as the main factor that controls the fast growth of salt structures during and after middle-late Pliocene, accelerates the progress of differential loading, gravity gliding and buoyancy, and causes the abnormal fast growth of salt structures in Kuche Depression in later stages.

关 键 词：库车坳陷 盐构造 成因机制 差异负载 区域挤压 

分 类 号：P542.2[天文地球—构造地质学]