博兴洼陷南坡地区输导体系分析

Analysis on migration path at the south slope area,Boxin sag

在博兴洼陷南坡地区,从断层的有效性、骨架砂体连通性、不整合面对油气运移的影响等方面分析,总结了博兴洼陷南坡主要存在3种输导体系类型:裂缝型、断层-砂体型、砂体-不整合面型。不同的输导体系类型在不同的构造带发育,从而控制不同类型油气的成藏。裂缝型主要分布在洼陷带西北部,断层-砂体型是斜坡带最主要的输导类型,砂体-不整合面型主要在南部斜坡带外带不整合面附近存在。

The effectiveness of fault,the connectivity of skeletal sand body,and the impact of unconformity surface on hydrocarbon migration at the south slope area of Boxing sag are discussed.Consequently,it is concluded that there are three types of migration paths as fissure type,fault plus sand body type and sand body plus unconformity surface type.Different type of migration path occurs in different structural zone, thus dominating the generation of different type of oil and gas pool.The fissure type of migration path is distributed in the northwest of the sag;the fault plus sand body type is the primary migration path in the slope;and the sand body plus unconformity type is near the outside zone of the south slope.