大型岩性地层油气田(区)形成与分布规律

The regularities of formation and distribution of giant litho-stratigraphic oil and gas fields

"十五"以来,岩性地层油气藏一直是中国石油勘探发现和增储上产的主体,探明储量占80%左右。基于东部、中部、西部六大盆地典型油藏实例解剖、新技术分析测试、成藏机理物理模拟、油气藏形成与分布模式等综合研究,构建了3类斜坡、3类凹陷、3种组合岩性油气藏成藏模式,揭示了岩性油气藏形成机制与主控因素,建立了岩性油气藏大油气区评价方法;揭示了地层尖灭型和风化岩溶型两大类地层油气藏形成主控因素与富集规律,建立了地层油气藏大油气区评价方法;深化了4类盆地岩性地层油气藏富集规律认识,形成针对性评价方法与精细勘探技术,明确了"十三五"油气勘探方向。研究成果支撑了油气勘探评价和选区,推动了岩性地层油气藏勘探。

Since the Tenth Five-Year Plan,the litho-stratigraphic reservoir has been the key area that contributes to China petroleum exploration and increase of oil reserves and production,with proved reserves accounting for 80%.In this study,lithologic reservoir formation model of three types of slope basin,three types of sag basin and three types of their combination have been constructed through typical reservoir analysis,new experimental analysis technique application,physical simulation of hydrocarbon reservoir accumulation mechanism,formation and distribution models of oil and gas reservoirs of six basins that distributed in eastern,middle and western of China.This paper not only reveals the formation mechanism and major controlling factors of lithologic reservoirs,but also creates a method of evaluating giant oil and gas province.Main controlling factors and accumulation rules of two main types of stratigraphic reservoirs which are lithologic pinchout type and weathering crust karst type are discussed,and their evaluation methods are established.Litho-stratigraphic reservoirs enrichment rules of four types of basin are further understood,the specified evaluation and delicate exploration technique are formed and the exploration direction of Thirteenth Five-Year Plan is defined.The research in this paper has supported evaluation and selection of oil and gas pools,promoting litho-stratigraphic reservoir exploration.