阜东斜坡带中上侏罗统输导系统发育特征及油气运聚模式分析

油气输导系统及油气运移特征决定了油气藏的形成与分布.从阜东斜坡典型的陆相缓坡特点出发,以中上侏罗统非构造油气藏为主要研究对象,研究了输导系统发育特征及油气运聚模式.指出阜东斜坡带输导系统及油气运聚过程具有3个特征:①阜东斜坡带的油气输导系统由砂体单一输导系统、砂体—断层复合输导系统、砂体—不整合面复合输导系统3种类型组成;②成藏期古构造特征、地层压力特征及古流体势特征表明研究区属于油气有利聚集带,尤其是东南部阜5井区;③研究区内油气运聚模式主要包括阜东斜坡中、北部受砂体—不整合面控制的油气侧向运移聚集模式和阜东斜坡东南部受砂体—断层输导系统及砂体—不整合面输导系统共同控制的油气运聚模式.

Analyses of the characteristics of the hydrocarbon passage system and the hydrocarbon migration and accumulation modes of middle-up Jurassic in Fudong slope

The characteristics of hydrocarbon passage system and hydrocarbon migration determine the formation and the distribution of reservoirs.The hydrocarbon passage system and the hydrocarbon migration and accumulation process of the middle-up Jurassic non-structural reservoirs in Fudong slope are studied.It is held that they have three characteristics as follows:(1)the passage system is composed of three types of sand-body system,sandbody——fault system and sandbody-unconformity system;(2)the characteristics of palaeo-structure,formation pressure and palaeo-fluid potential show that Fudong slope,especially the Fu-5 region in south-east is favorable hydrocarbon accumulation region;(3)the hydrocarbon migration and accumulation mode of the non-structural traps in Fudong slope can be divided into two types,one is the lateral migration mode which presents in middle——north part of Fudong slope and be controlled by sandbody—unconformity system,and the other is the vertical migration mode which presents in south-east part of Fudong slope and be controlled by sandbody—fault system and sandbody—unconformity system.