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潜江凹陷潜江组岩性油藏的形成、分布及富集受到多种因素的控制,不同地区或同一地区不同层位岩性油藏富集程度是不同的,其中以王场Eq423砂组岩性油藏最为富集。通过对今、古构造背景及成油气地质条件的精细解剖,认为王场地区具有“古下坡、今上坡”良好的油气成藏背景,古下坡有利于Eq423砂组三角洲前缘砂体延伸至王场地区沉积,今上坡有利于捕获油气;同时具有十分优越的成油气地质条件,平面上紧邻蚌湖生油洼子、纵向上紧邻主要生油层系,发育席状砂储集体,具有砂体和断层双向疏导体系及良好的时空配置关系。总结出王场Eq423岩性油藏富集“四元”成藏主控因素,即烃源岩控制油气分布,构造背景决定岩性油藏规模,输导体系是岩性油藏富集的关键,砂体临界物性是影响油气充注的内在主控因素,且当“四元”均较好时油富集。
The formation, distribution and enrichment of the Qianjiang Formation lithologic reservoirs in the Qianjiang sag are controlled by many factors. The enrichment levels of lithologic reservoirs in different layers and layers in different areas or in the same area are different. Among them, the Eq423 sand group Lithologic reservoirs are the most abundant. Based on the fine anatomy of the present and paleocontinent structures and the geological conditions of oil and gas formation, it is considered that the Wangchang area has a good hydrocarbon accumulation background of “paleo-downhill, up-slope”, and the paleo-downhill slope favors the delta front of the Eq423 sand group The sand body extends to the deposition of the Wangchang area. Now the uphill slope is good for trapping the oil and gas. At the same time, it has very favorable geological conditions for oil and gas formation. It is close to the Benghu oil-bearing depression on the plane and is longitudinally close to the major oil-bearing formations. Collective, with a sand body and fault two-way drainage system and a good relationship between space-time configuration. This paper summarizes the main factors controlling the accumulation of “Quaternary” reservoirs in the Eq423 lithologic reservoirs in Wangchang, that is, the hydrocarbon source rocks control the oil and gas distribution and the tectonic setting determines the size of lithologic reservoirs. The transport system is enriched in lithologic reservoirs The critical physical properties of sand bodies are the main controlling factors affecting the filling of oil and gas, and the oil is enriched when the “quaternary” is better.