【摘要】 歧口凹陷及邻区上第三系发育两种类型油气藏:大断层下降盘被次级断层复杂化了的逆牵引构造油藏和披覆背斜油藏。大断层及与之伴生的次级断层的活动时期、活动强度、断距、断至层位、断至深度和断层间距等控制了上第三系油气运移和逆牵引型构造内油气富集程度。圈闭及运移途径控制了披覆型构造油气藏的形成和原油性质。歧口凹陷北区上第三系断层活动、油气运移及储盖组合特征与南区相似,是有利的勘探后备区。进一步勘探部署的关键是要查清断层组合及落实圈闭。更多还原

【Abstract】 There are two types of Neogene reservoirs in Qikou sag and its adjacent uplift, one being the rollover anticlinal traps which are complicated by many shaller faults on the upthrown side of the major fault,and another being the drap anticlinal traps. The HC migration and richness in rollover anticline are controlled by the active period, offset, formation and depth of major and secondary faults. The formation and character of crude oil of drap anticlinal traps are controlled by trap type and migration path. The feature of fault activities, migration and reservoir-seal association in Qibei is similar to that of Qinan being a promising area. The key for further exploration is to identify the horizons of major fault and to define the traps.更多还原