江陵凹陷西南部油气特征及油气富集规律分析

Hydrocarbon Characteristics and Its Enrichment Rule in the Southwest of Jiangling Depression

江陵凹陷西南部已发现谢凤桥油田和6个含油气构造;油气纵向形成3种油气成藏组合,组成7套含油层系,储量和产量主要集中在Ex下Ⅱ、Ⅲ油组、Es3和K2y4中;平面上含油气层段的埋深呈现由北往南、由东往西依次抬高的趋势;油气富集主要受控于断裂系统的活动期次、烃源岩的分布、储集层物性、非均质性和沉积相带的展布等因素,油气藏运聚规律整体表现为近源短距离运聚成藏特征。

Xiefengqiao Oilfield and the other 6 oil-gas-bearing structures are found in the southwest of Jiangling Depression. Vertically 3 kinds of hydrocarbon accumulation assemblages are developed, by which 7 sets of oil-bearing series of strate are composed, reserves and production are mainly concentrated in the Ex_ Lower Ⅱ,Ⅲ formations and Es_3, K_2y_4.On the plain, the buried depth of oil-gas-bearing zones are distributed from the north to south and risen gradually from the east to west. The hydrocarbon enrichment is controlled by the factors of period of movement of the fault system, the distribution of source rocks, the physical property of the reservoir, heterogeneity, and the arrangement of sedimentary facies, etc. the hydrocarbon migration rules present the characters of proximal and short distance migration and accumulation of reservoir formation.