渤海湾地区构造变换带及油气意义

Structural transfer zones and their hydrocarbon significances in Bohai Bay area

利用地震剖面解释结果和构造编图成果,分析了渤海湾地区构造变换带的特征及其油气意义。渤海湾地区主要发育区域横向调节带和局部变换带两类构造变换带。区域横向调节带由北西向大型走滑断裂带组成,这些断裂带同时也是强地震活动带,将渤海海域地区分隔为北、中、南3段。局部变换带主要发育在相互作用的分段正断层的叠置区内。根据分段正断层的倾向及其组合特征,可将局部变换带分为转换斜坡型、斜向背斜型和地垒型3类。渤海湾地区构造变换带具有重要的油气意义,主要表现为控制构造圈闭的形成、有利于优质储集层的发育及控制油气运移过程等。

Based on the interpretation results of seismic data and structural maps, the structural transfer zones and their significances for formation of petroleum accumulations in the Bohai Bay area were discussed. The structural transfer zones are divided into regional transverse accommodation zones and local transfer zones. The former ones consist of large-scaled NW-striking faults, where intense earthquake activities exist, and which divided the offshore area of the Bohai Bay area into the northern, central and southern segments. The latter ones are located in the overstepping area in which normal faults interacted one another. According to the dips and assemblage characteristics of the normal faults, three types of local transfer zones have been classified in the Bohai Bay area, including the relay ramps, oblique anticlines and horsts. The hydrocarbon significances of the structural transfer zones involve their controlling influence in the trap formation, the high quality reservoir development and hydrocarbon migration.