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通过综合分析塔里木盆地柯坪-巴楚地区露头剖面的宏观组合和微观结构,总结出奥陶系不同级别层序界面的表现特征、成因机制,指导盆地内层序界面的研究。柯坪-巴楚地区奥陶系主要有3个级别的层序界面:一级层序界面发育在构造变革期,如受到造山运动或区域构造隆升作用等影响,表现为角度不整合面、平行不整合等特征;二级层序界面发育在沉积环境重大转换阶段,主要受到全球海平面变化的影响或局部构造运动影响,表现为平行不整合、淹没不整合等特征;三级层序界面与局部构造运动有关,表现为局部平行不整合。层序界面的表现形式包括古土壤层、喀斯特化、地层削截、地层超覆、岩性岩相突变等。通过总结不同层序界面的性质和成因,分析不整合面的规模和发育部位,预测有利岩溶储层发育的区带。
By comprehensively analyzing the macroscopic composition and microstructure of the outcrop profile in Keping-Bachu area, Tarim Basin, the characteristics, genesis and mechanism of different levels of Ordovician sequence interface are summarized, and the interior sequence boundary of the basin is studied. The Ordovician in the Keping-Bachu area mainly has three levels of sequence boundaries: the first-order sequence boundaries developed during the tectonic transformation period, such as the unconformity due to the orogeny or regional uplift, Parallel unconformity and so on. The second-order sequence boundary developed in the major conversion stage of sedimentary environment and was mainly affected by the global sea-level change or the local tectonic movement. The second-order sequence boundary was characterized by parallel unconformity and inundation, And the local tectonic movement, manifested as partial parallel unconformity. The sequence interface manifestations include the paleosol layer, karstification, stratigraphic cut-off, stratigraphic overrun, and lithologic facies facies alteration. By summarizing the nature and causes of different sequence boundaries, the size and development of unconformity surfaces are analyzed, and the zones favorable for the development of karst reservoirs are predicted.