DISCRIMINATING EFFECTIVE PETROLEUM MIGRATION PATHWAYS IN RIFT BASINS—TAKE THE DONGYING SAG AS AN EXAMPLE
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摘要: 以渤海湾盆地东营凹陷中央隆起带为例,从油气地化特征、流体性质、油气显示、原油物性等方面入手,总结了断陷盆地油气有效输导体系的判识方法,明确了有效输导体系的分布特征。研究表明,断陷盆地有效输导体系主要受断层"时空有效性"控制,在时间和空间上与输导断层匹配较好的砂体与其共同组成有效输导体系;油气从生油洼陷沿运移通道呈发散状运移,随着运移层位及距离的改变,逐渐向输导断层较强的优势输导部位聚集成藏;靠近生油洼陷切穿烃源岩的二、三级断层的活动时间较长,活动期与成藏时间匹配较好,多为有效输导断层,控制了该区油气的运聚过程和分布规律。Abstract: To ascertain transmit faults is the key factor to confirm the effective migration pathways which are consist of fault,sand body,unconformity,etc.in!continental rifted basin.Take central uplift belt in the Dongying Sag as an example,begin with the geochemical behavior,fluid property,hydrocarbon show,petroleum physical property etc.,the discriminating methods and distribution of effective migration pathways are definitely.The results show that effective migration pathways in rift basins are controlled by fault validity in time and space,these faults and contacted sand bodies make up effective migration pathways together.Oil and gas divergent from generating sub-sags and accumulate toward the advantage parts of transmit fault with the formation and distance changed.Second and third faults against petroleum generating sub-sags with relatively longer active time are the effective migration pathways, which are well match with the oil-generating stage,and controlling the distribution and process of petroleum.
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Key words:
- effective migration pathways /
- fault /
- petroleum migration /
- rift basin /
- the Dongying Sag /
- the Bohai Bay Basin
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