济阳坳陷垦东地区油气运聚规律再认识
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摘要
近期济阳坳陷垦东地区发现新的含油层系和油藏类型,须对油气运聚规律重新认识。利用地震、地质及钻井资料,对垦东地区不同含油层系的主要油气运移通道和优势运移路径进行研究,认为研究区新近系和古近系为2套相对独立的油气运聚子系统。上部油气运聚子系统为构造活动期双通道式运移,走滑断裂带和骨架砂体是油气横向运移的主要通道,具有断—砂输导型和砂—断输导型2种油气输导方式;下部油气运聚子系统为构造平静期单通道式缓慢运移,不整合面是油气横向运移的有效通道,油气以断层—不整合面输导为主。研究区上、下2套油气运聚子系统具有不同的油气运聚规律,据此建立垦东地区"二层台"式油气运聚模式。
With the new oil-bearing formations and types of reservoir found in Kendong area in recent years,it is necessary to reconsider the petroleum migration and accumulation law accordingly. The main and priority migration pathway of different oil-bearing formations were studied by using seismic data,geological data and new well logging data of the area. It is shown that there are two different petroleum migration and accumulation sub-systems in the Neogene and the Paleogene respectively. For the Neogene system,the oil and gas migrated laterally through two paths that were strike slip faults and sandstone framework during the tectonic active period,and the paths were named as fault-sandstone system and sandstonefaults system respectively. For the Paleogene system,the oil and gas migrated slowly through the single path that was the unconformity for hydrocarbon transporting laterally during the tectonic stable period,and the path was named as fault-unconformity system. The petroleum migration and accumulation model of"two-story platforms"was built according to the differences of the migration medium and their priority pathway between two oil and gas bearing formations.
引文
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