白东地区古近系构造特征与油气成藏条件分析

白东地区位于歧口富油气凹陷滨海海域,是一个受两期构造叠加形成的近东西向大型背斜构造。勘探初期以古近系的东营组、新近系为目的层,以中部地堑构造为主探对象,虽见油气显示,但未获得实质性突破。通过精细研究认为,古近系沙河街组为依附海河断层的大型背斜构造,位于歧口凹陷主体区,天然气资源丰富;构造的分区性和北部燕山物源的波及强弱及储盖组合配置关系的不同,决定了白东地区东部主体带发育以沙一下为勘探目的层系的构造气藏,西翼斜坡区则可形成东营、沙一中、沙一下多套目的层系的构造-岩性气藏。

Analysis of Palaeogene oil and gas accumulation condition in Baidong region

Baidong area is located in Binhai region in Qikou sag,prolific oil gas depression,a east- west large anticline structure formded by two phase structure superposition.In the beginning of exploration,the target layer is Palaeogene Dongying formation and Neocene,the middle graben structure is main target,though it shows oil and gas but no breakthrough.Fine Study shows that Shahejie reservoir is a large anticline attached to Haihe fault,which is located in the main part of Qikou sag,rich in gas resource.The difference of structural regionalization,the distance of provenance and the relationship between reservoir and seal combination configuration determined main body in eastern Baidong region developed bottom Es1 tectonic reservoir,west slope formed tectonic lithologic gas reservoir,including Dongying formations,middle Es1,bottom Es1 formations.The paper provides guiding significance for the future oil and gas exploration in the different structure part.