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四川盆地东北部长兴-飞仙关组是近年来我国发现的重要天然气储集层,已成为我国油气的重点勘探地区之一。通过对川东北长兴-飞仙关组地层沉积相特征的分析,探讨其储层发育的机制。研究发现,川东北地区长兴-飞仙关组主要发育有陆棚、缓坡、开阔台地、局限台地及台地边缘礁滩等沉积单元,台地边缘礁滩相为该区最有利的储层微相,礁、滩相发育有关的各种颗粒岩、泥粒岩或鲕粒岩,经白云石化和选择性埋藏溶解作用形成的各种次生孔、洞、缝的储渗体,它们被周围致密岩体的包围、封堵及上覆含泥质、膏质岩层封盖而形成圈闭。
The Changxing-Feixianguan Formation in the northeastern Sichuan Basin is an important natural gas reservoir discovered in China in recent years and has become one of the key exploration areas for oil and gas in China. Through the analysis of sedimentary facies characteristics of Changxing-Feixianguan Formation in northeastern Sichuan, the mechanism of reservoir development is discussed. The study found that the Changxing-Feixianguan Formation in northeastern Sichuan mainly developed sedimentary units such as continental shelf, gentle slope, open platform, confined platform and reef beach of platform margin. The marginal reef bank facies are the most favorable reservoir microfacies in this area, Reef and beach facies associated with a variety of granulites, mudstone or oolitic rock, dolomitization and selective burial dissolution formed by a variety of secondary pores, holes and seams of reservoir infiltration, they are surrounded by tight rock Surrounded by the body, sealing and overlying the muddy, gypsum rock formation and formation of traps closure.