霸县凹陷文安斜坡构造特征及勘探潜力分析

Structure features and potential prospect of Wenan slope in Baxian Depression

文安斜坡主要经历了两次反转和三期断裂活动,发育北东、北西和北东东向三组方向的断裂,南北分区特征明显。北部的苏桥地区发育北东和北西向两组断层,呈网状组合;中部史各庄地区发育北东东向断层,呈斜列展布;南部长丰镇地区发育北东向断层,呈平行排列。受断裂控制,文安斜坡发育了苏桥—信安镇断裂构造带、史各庄鼻状构造带、长丰镇—议论堡鼻状构造带。本文利用连片三维地震资料进行整体构造研究及勘探潜力分析后认为:霸县凹陷烃源岩厚度大、埋藏深,剩余资源量大;斜坡带潜山及潜山内幕发育多层系勘探目标,具有形成规模储量的勘探前景;斜坡内带发育深层规模致密砂岩油气目标,有望形成面积较大的源内深层低丰度致密砂岩规模油气藏;斜坡中外带地层岩性领域勘探前景良好,具备形成多层系油气叠合连片的地质条件。

Wenan slope experienced twice reversals and three faultings,namely,NE faulting,NW faulting and NEE faulting.The characteristics between the North and the South were quite different.The two netty faults in Suqiao area were in NE and NW directions.In the central Shigezhuang area,NEE faults were developed en echelon distribution.In Changfeng town of the south part,NE faults were arranged in parallel.Controlled by faults in Wenan slope,three structure zones were developed:Suqiao-Xinanzhen fault structure zone,a nose structure zone in Shigezhuang,and a nose structure zone in Changfengzhen-Yilunpu.Using merging 3D seismic data,we analyze in this paper the overall structures and obtain the following understanding:①Hydrocarbon source rocks in Baxian Depression was deep,thick,and large;②As exploration targets,there are multilayer in buried hills of the slope;③Tight sandstones in the slope may be deep low-abundance tight sandstone reservoirs;④Horizon-lithology reservoirs outside the slope may have geological conditions for large multi-layer hydrocarbon resources.