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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 tectonic deformation characteristics in the northern part of the central tower, the evolutionary history of the lowstands in the middle Tarim Basin and the control of the Ordovician carbonate sediments are discussed for the first time in the giant knee zone model, which is different from the conventional multi- Related structures to explain the deposition sequence and trap mechanism point of view. The Paleozoic experienced at least three significant stages of deformation in the Paleozoic. In particular, the symmetrical conjugate fold belt and box-shaped anticlines formed by the Caledonian mid-stage 1 controlled the Ordovician depositional pattern and resulted in the late Early Ordovician Isolated platform and north-south symmetry, but the slope of the slope of the other two different edges. The carbonate rocks in the margin of the platform and the source rocks in the slope zone constitute the spatial configuration, and the depositional facies of the Ordovician Yingshan Formation and the Lianglitage Formation shallow marine carbonate rocks , Especially in the Late Ordovician Lianglitage Formation thick reef bank sedimentary deposition edge of the platform. The karst weathered crust reservoirs on the north slope of the Tazhong-Middle Ordovician Yingshan Formation and the Upper Ordovician Lianglitage Formation constitute the key target reservoirs for exploration in the Tazhong area.