巨型膝折带:塔中油田奥陶系沉积的构造控制  

A LARGE KINK-BAND:TECTONIC CONTROLLING FACTOR FOR THE ORDOVICIAN SEDIMENTS IN THE TAZHONG OILFIELD

作　　者：申银民[1] 李越[2] 李猛[1] 刘永福[1] 李启剑[2] 胡太平[1] 董立胜[1] 

机构地区：[1]塔里木油田勘探开发研究院,新疆库尔勒841000 [2]中国科学院南京地质古生物研究所,江苏南京210008

出　　处：《地层学杂志》2013年第3期297-302,共6页Journal of Stratigraphy

基　　金：国家自然科学基金(No.41072002);国家科技重大专项(2011ZX05008-001-B0);国家基金委创新研究群体项目(No.41221001)资助

摘　　要：在对塔中北部构造变形特征分析的基础上,首次以巨型膝折带模式论述塔中低凸起的演化历史和对奥陶系碳酸盐岩沉积的控制,有别于以往多用与断层及其相关构造来解释沉积序列和圈闭机制的观点。塔中在古生代至少经历过3期重要的变形阶段,特别是加里东中期的1幕形成的对称共轭膝折带和箱状背斜控制了奥陶纪的沉积格局,造成早奥陶世晚期的孤立台地和南北对称、但坡度有别的两个边缘坡折。台地边缘的碳酸盐岩与斜坡带烃源岩构成空间配置,台地区沉降速度与沉积补偿速度基本均衡的构造背景下沉积了奥陶系鹰山组和良里塔格组浅海相碳酸盐岩,特别在奥陶纪晚期良里塔格组出现台地边缘较厚的生物礁滩沉积建造。塔中北坡下—中奥陶统鹰山组和上奥陶统良里塔格组顶部的喀斯特型风化壳型储层构成了塔中油气勘探的重点目的层。Based on the analysis of the tectonic deformation in the southern Tazhong Oilfield, the present study proposes for the first time a large kink structure as an essential controlling factor to explain sedimen- tary history and petroleum trap formation in Ordovician carbonates of the Tazhong area. This model is dif- ferent from previous models that focused on faults and related structures as the key tectonic control on sed- imentary sequences and trap formation. The result illustrates that at least three episodes of tectonic de- formation occurred in the Tazhong area during the Paleozoic time. The Ordovician sedimentary pattern was essentially controlled by the first episode of deformation that established a symmetrical conjugate chest-like anticline. The topography of the epeiric continental shelf was characterized by an isolated platform sur- rounded by two symmetrical slope-breaks to the south and north, although the two slope-breaks had differ- ent inclinations sloping angles. The platform margin carbonate reservoirs are juxtaposed with the slope source rocks. Such a tectonic setting maintained a balance of subsidence rate and sedimentary compensation rate, thus maintained a shallow marine carbonate platform during the Ordovician. The thick reef complex of the Late Ordovician Lianglitag Formation formed in platform margin. Karst-type reservoirs of the Low- er-Middle Ordovician Yingshan Formation in the northern slope and the Kaitian （Upper Ordovician） reef- complex Lianglitag Formation in the Slope-Break are both considered oil-gas exploration targets in theTazhong Low-Uplift.

关 键 词：资源地层 巨型膝折带 构造控制 碳酸盐岩沉积 奥陶系 塔中低凸起 塔里木板块 新疆 

分 类 号：P534.42[天文地球—古生物学与地层学] P539.4[天文地球—地质学]