川东北元坝地区三叠系飞仙关组储层地质模型

Geological Model of Lower Triassic Feixianguan Reservoir in Yuanba Area,Northeast Sichuan

依据对川东北元坝地区飞仙关组沉积岩石学特征、储集空间类型及物性分布特征的综合研究,对该地区的储层特征加以抽象和概念化,建立了飞仙关组储层地质模型。地质模型揭示元坝地区海相碳酸盐岩储层段均发育在台地边缘沉积区。其中,台地边缘浅滩最为发育,台地边缘斜坡次之,未见台地边缘生物礁。飞仙关组一段至二段下部为台地边缘斜坡沉积,二段上部至三段为台地边缘浅滩沉积。认为飞仙关组二段和三段的鲕滩沉积储集岩为下一阶段勘探开发的重点,其中飞仙关组二段孔隙—裂缝性储层的勘探开发潜力尤为巨大。

The sedimentography characteristics, types of reservoir space and distributional characteristics of physi- cal property in Lower Triassic Feixianguan Formation reservoir inYuanba area of Northeast Sichuan are re- searched comprehensively and a geological model of Feixianguan Oil Reservoir is built through abstraction and conceptualization of the sedimentary characteristics. The geological model reveals that the marine facies carbonate reservoir is well development in the sedimentary areas of platform margin which includes slope, reef and shoal sedimentary areas. Among them ,the oil reservoir in the platform-margin shoal are well developed,that in platform- margin slope area ranks the second but reef in platform-margin area is not found developed. The 1st Member to the lower 2nd Member of Feixianguan reservoir belongs to slope facies and the upper 2nd Member to the 3rd Member is shoal facies. It is suggested that the oolitic shoal reservoir rock developed in the 1st and the 2nd Mem- bers are favorable to future exploration,especially the 2nd Member of porisity-fracturing reservoir that have good potential.