东濮凹陷中央隆起带构造变动与油气分布的相关分析

东濮凹陷是渤海湾盆地内富含油气的凹陷，凹陷内的中央隆起带是主要的油气聚集带。该带在形成过程中经历了块断抬斜、重力滑动、反拖牵引、盐岩拱升等多种形式的构造变动。块断抬斜的结果产生了右行雁列的卫城、文留、桥马抬斜亚带及低抬隆带和高抬隆带，重力滑动形成了广泛分布的重力滑动断层和数量众多的顺向断鼻构造和逆牵引背斜；反拖牵引造成了断阶背景下的断鼻构造;而盐岩拱升则促成该带下垒上堑的“镜像结构”，并在深层形成盐背斜和反向断块以及构造-岩性圈闭，浅层形成对倾的阶梯式断层和一系列反向断块构造。多种构造变动不仅控制着各类构造的形成，而且制约着油气的聚集和分布。文中提供的实例表明，采用构造变动与油气分布相关分析法，是提高该带油气勘探效率的有效方法。

Correlation of hydrocarbon occurrence to structural evolution of central uplift belt in the Dongpu depression

The Dongpu depression in Bohai basin is a hydrocarbon-abundant depression,whose central uplift belt has major hydrocarbon accumulations. The central uplift belt underwent a series of structural evolution:fault block tilting,gravity slumping,inverse drag,rock salt uplifting and so on.Fault block tilting resulted in subzones,low uplift zone and high uplift zone in right handed echelon pattern in Weicheng, Wenliu and Qiaoma areas. Gravity slumping created wide gravity slump faults, multitudinous faulted noses cut by faults dipping with the bed,and reverse drag aoticlines. Reverse dragging produced some faulted noses in fault terrace background. Rock salt uplifting caused grabenhorst superposed structure,which has salt anticline,faulted block due to the faults dipping against the beds,and lithologic hydrocarbon trap in the deep part,and includes inward-dipping terrace faults and a series of faulted blocks due to faults dipping against beds in the shallow prat.Multiple structural evolutions caused different geological structures and various hydrocarbon accumulations. It is illustrated that the correlation analysis of structural evolution to hydrocarbon occurrence is an effective method for raising hydrocarbon exploration efficiency in this structural belt.