塔里木盆地巴楚隆起早古生代古构造格局研究  

Palaeotectonic framework of the Early Paleoic in Bachu uplift,Tarim basin

作　　者：吕明[1,2] 汤良杰[1,2] 余腾孝[3] 杨勇[1,2] 曹自成[3] 岳勇[3] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油大学盆地与油藏研究中心,北京102249 [3]中国石化西北油田分公司,乌鲁木齐830011

出　　处：《中国矿业大学学报》2014年第1期99-106,共8页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(41172125;40972090);国家重点基础研究发展计划(973)项目(2012CB214804);国家科技重大专项(2011ZX05002-003-001);中国石油化工股份有限公司项目(P11086)

摘　　要：选择巴楚地区典型的地震剖面,对加里东早期、加里东中期Ⅰ幕、加里东中期Ⅲ幕以及海西早期形成的T18,T47,T07,T06不整合面进行研究.根据不整合面与之上、之下地层的接触关系,将不整合分为整一/整一型、整一/削截型、超覆/整一型以及超覆/削截型4类.对比分析不同时期不整合面类型以及分布范围的变化规律,同时利用测井资料,分析了塔里木盆地巴楚地区早古生代古构造演化过程,认为巴楚地区在早古生代具有明显的差异构造演化特征.研究表明:巴楚地区在寒武纪呈坳陷形态,地层均匀展布,无明显的差异隆升特征;中奥陶世,巴楚地区整体均匀隆升,造成巴楚地区中奥陶统一间房组及恰尔巴克组的缺失;从晚奥陶世开始巴楚地区呈现出明显的差异隆升特征,呈现出西南高、北东低并向北东倾的斜坡形态;志留纪-早中泥盆世,巴楚地区东南部成为整个地区的构造高部位,进而表现为南东高北西低、北西倾的斜坡形态.This study takes on typical seismic section in Bachu as a case in point, and studies the unconformities of T8^1,T7^4,T7^0,T6^0, which were formed in the early Caledonian, substages I and Ill of the mid-Caledonian and early Hercynian, respectively. According to the contact relation- ship among overlying and underlying strata, the unconformities are divided into four types, namely, concordance-concordance type, concordance-truncation type, onlap-concordance type and onlap-truncation type. This study comparatively investigates the variation of different un- conformities and distribution scope in different periods, and analyzed the tectonic evolution in the early Paleozoic of Bachu region combining with the previous studies in the use of logging data. This analysis results in the obvious characteristic of different tectonic evolution in the Early Paleozoic. The results show that the Bachu region was a depression with subhorizontal strata and no differential uplift in the Cambrian. In the early and middle Ordovician, the Bachu region was uplifted which resulted in the absence of Yijianfang and Qiaerbake formations. Be- ginning from the late Ordovician, differential uplifting activities were strong in the region which resulted in a NE-verging slope with higher and lower topography in the southwest and northeast parts, respectively. During the stage from the Silurian to the Devonian, the south- east of Bachu was the highest part, and a northwest-verging slope shaped.

关 键 词：巴楚隆起 古构造格局 不整合类型 构造演化 

分 类 号：P542.3[天文地球—构造地质学]