柴达木盆地三湖地区第四系构造发育历史及其勘探意义  

Study on the Quaternary Tectonic Evolution and Its Significance for Exploration in the Sanhu Area,Qaidam Basin

作　　者：郭泽清[1,2] 孙平[2] 张绍胜[2] 田继先[2] 孔骅[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油勘探开发研究院廊坊分院天然气地质所,廊坊065007

出　　处：《高校地质学报》2012年第2期372-378,共7页Geological Journal of China Universities

基　　金：国家大型油气田及煤层气开发科技重大专项(2008ZX05)资助

摘　　要：地层厚度能够反映构造沉降及隆升。通过对柴达木盆地东部三湖地区探井统一分层后,计算现今地层厚度,然后分期平面成图。这些图件揭示出三湖地区北斜坡背斜构造形成历史并不统一,具有由北东向南西依次发育的特征:伊克雅乌汝、南陵丘、驼峰山背斜最早成型,是第四纪以来的同沉积背斜。k11沉积后,台吉乃尔和涩北二号才开始形成,接着涩北一号形成,而台南背斜形成最晚。涩东鼻状构造是在k1以后才抬升的,而南斜坡至今未形成背斜构造;而且隆升速度也是不均衡的,具有逐渐加强的趋势,尤其是更新统末期(k5以后)背斜构造快速抬升。该地区构造演化历史的确定,对于寻找背斜构造形成的有利区带具有指导意义。Stratum thickness can reflect tectonic subsidence and/or uplift. After compiling stratigraphic data of all wells in the Sanhu area of Qaidam basin, the present stratum thickness was calculated, and isopach maps of different periods were drawed. These maps show that the formation history of the anticline was not uniform, and the structure started to form from the northeast to the southwest. Yikeyawuru, Nan Linqiu, and Tuo Fengshan anticlines were formed first and they have been the syn-depositional anticline since the Quaternary. Then Taijinaier and Sebei 2 began to uplift, which was followed by Sebei 2. Tainan anticline was the youngest and Sedong nose structure began to uplift after k 1 was deposited. No anticlines were formed in the southern slope until today. The speeds of their uplift are not even, and the speed gradually increased, especially, the anticlines had a tendency for rapid uplift after k5 was deposited. The understanding of tectonic evolution history is very helpful to search for favorable zones where low-amplitude structures were developed.

关 键 词：三湖地区 地层厚度 背斜构造 发育历史 勘探意义 第四系 

分 类 号：P618.130.2[天文地球—矿床学]