霸县凹陷文安斜坡潜山内幕油气藏形成特征

Formation characteristics of inside buried hill reservoir in Wenan slope of Baxian Sag

综合利用地质、地球物理、油气地球化学方法,对霸县凹陷文安斜坡潜山带的内部结构,以及已发现油藏的油气性质、储层特征、油藏特征进行了分析研究。文安斜坡潜山带存在2种类型的潜山油气藏:潜山顶部油气藏和潜山内幕油气藏。潜山内幕油气藏与潜山顶部油气藏的不同在于其位于潜山内部,受不整合面作用的影响较小。内幕隔层是潜山内幕圈闭形成的关键,断层和内幕裂缝型储层控制了内幕油气藏油气的输导和聚集,供烃窗口和输导体系有效配置控制了油气的运移方式。针对文安斜坡地区,总结出不整合面供烃-内幕裂缝型储层/断层输导运聚与断层供烃-内幕裂缝型储层输导运聚2种内幕油气运聚模式。

The internal structures,the oil and gas property of found reservoir and the reservoir characteristics in the buried hill belt of Wenan slope in Baxian Sag are studied by the integrated methods of geological,geophysical and geochemistry.The buried hill reservoirs are divided into two types.One is the reservoir in the top buried hill and another is the reservoir in the inside buried hill.The main difference between them is that the latter lies in the inner part of the buried hills and is little affected by the unconformity.Inside barrier is the key to the formation of traps in the inside buried hill.Faults and inside fractured reservoirs control the migration and accumulation of hydrocarbon.The effective distribution of the hydrocarbon supply window and the passage system control the models of hydrocarbon migration and accumulation.Two models of hydrocarbon migration and accumulation are summarized aimed at the Wenan slope area.One is that the hydrocarbon is supplied by the unconformity and the hydrocarbon migrates through the faults and the inside fractured reservoirs;another is that the hydrocarbon is supplied by the faults and the hydrocarbon migrates through the inside fractured reservoirs.