辽河东部凹陷北部古近系输导体系及其对油气运移的影响

Paleogene passage system in the northern part of Liaohe eastern depression and its effect on hydrocarbon migration

依据沉积体系、断层及其活动期次、不整合特征等分析结果,探讨了辽河东部凹陷古近系输导体系特征及其对油气运移的控制作用。研究结果表明,研究区发育连通砂体、断层和不整合3种输导体系。砂体的连通性与孔渗性、断层两盘岩性配置关系与断层活动性、不整合类型、不整合面上下岩性配置关系是影响输导体系运移效率的主要因素。分析了输导体系对油气运移的控制作用,认为沙一、二段和沙三段的连通砂体是油气横向运移的主要通道,牛青断层和茨东断层是沙一、二段和沙三段油气侧向运移的通道,更是沙一、二段和东营组重要的油源断层;沙一、二段与沙三段之间的不整合是茨榆坨潜山及牛居构造中油气重要的横向运移通道。同时还指出,各类输导体系之间的配置关系决定盆地的整体运移效率,茨东断层和牛青断层在整个输导体系中起重要的瓶颈作用。

In terms of the research of depcsitional system, fault and its active stages, unconformity, paleogene passage system and its oontmUing on hydrocarbon migration in Liaohe eastern depression were studied. Study results show that it developed three passage system including connected sand body, fault and tmoonformity. Many factors have important influence on migration efficiency such as the oonnecting of body and permeability, the relation between two walls of a fault and faulting movement, unconformity type, lithological configurations above and beneath the unoonfonnity. The oontrolling of possage system on hydrocarbon migration was analyzed. It reveals that oonneeted sand body among Es3, ESl and Es2 segments is an important lateral passage. Niuqing and Cidong faults are vertical possage among Es3, ES1 and Es2 segments. Moreover, they are also the important migration fault among Es1, Es2 and Dongying formation. On the other hand the unoonfonnity between E21 ＋ 2/Es3 is the lateral possage in Ciyutuo buried hill and Niuju structure. The research indicates that configurations of these throe passages are major factors affecting the effideney of hydrocarbon migration, in which the key factors are Cidong and Niuqing faults.