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普光气田飞仙关组滩相大气田的发现,展示了碳酸盐岩滩控型储层巨大的勘探潜力,然而后续的开发井钻探表明,传统沉积相研究提出的成带分布的台缘滩并不稳定,因此,研究鲕滩发育分布规律尤为必要。以四川盆地普光气田下三叠统飞仙关组为研究对象,通过对颗粒岩测井识别模型、滩体的环境微相及其分布主控因素分析,深入探索了普光气田飞仙关组鲕滩的发育分布规律。依据颗粒岩与地层厚度之比把台缘滩划分为滩核、滩缘及滩间微相,从而给碳酸盐岩微相赋予更多的环境和储集意义。普光气田飞仙关组发育台缘鲕滩和台内鲕滩2种滩体。鲕滩分布受控于沉积期地貌变化,总体上沿台地边缘呈带状分布,但其内部存在的次一级微地貌变化导致了滩体横向分布的变化,进而导致了滩相储层严重的横向非均质性。
The discovery of the Banxiaoda gas field in the Feixianguan Formation of the Puguang Gasfield shows the huge exploration potential of the carbonate-rocky-controlled reservoir. However, subsequent exploration drilling shows that the sedimentary facies belt Is not stable, therefore, the study of oolitic beach development and distribution is particularly necessary. Taking the Feixianguan Formation of the Lower Triassic in the Puguang Gas Field, Sichuan Basin as the research object, through the identification model of the grain rock, the environmental microfacies of the beach body and the main controlling factors, The development and distribution of the beach. According to the ratio of granulite to formation thickness, the marginal beach is divided into beach core, beach margin and interbedded microfacies, giving the carbonate microfacies more environmental and reservoir significance. Feixianguan Formation in Puguang Gas Field developed 2 kinds of beach bodies such as oolitic beach and oolitic beach in Taiwan. The distribution of oolitic beach is controlled by the change of geomorphology during the depositional period and generally distributed along the edge of the platform. However, the sub-primary micro-topography changes within the reservoir led to the lateral distribution of the beach body, Horizontal heterogeneity.