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滇东、黔西南(兴仁、兴义、紫云)及桂西北地区早二叠世早、中期(Pam-irina 带至 Misellina 带,碳酸盐岩)地层分布广泛。纵向上的岩性均一,地层连续;横向上,岩相分异明显,生物相多样,是我国研究早二叠世地层及寻找碳酸盐岩油气藏理想的地区之一。本文在初步总结近年来研究成果的基础之上,结合野外实地考察,并以宏观及微观相结合,概述了区域地质背景,从岩石类型、沉积物的颜色、沉积结构、构造及生物群特征等几个方面来论述局限海台地相、开阔海台地相、泻湖相、生物滩相、生物礁相及盆地相等六个沉积岩相的特征,分析其沉积环境和展布格局。以期对石油勘探增强预见性,提供一些地质信息。
The strata of the Early and Middle Permian (Pam-irina zone to Misellina zone, carbonate rock) in the eastern Permian and Qianxinan (Xingren, Xingyi, Ziyun) and northwestern Guangxi are widely distributed. Longitudinal lithology is homogeneous and the strata are continuous. Laterally, the facies are highly differentiated and diverse in biological facies. It is one of the ideal areas for studying the Early Permian strata and searching for carbonate reservoirs in China. Based on the preliminary research results of recent years and based on field investigations, this paper summarizes the regional geological background by combining macroscopic and microcosmic aspects. From the aspects of rock type, sediment color, sedimentary structure, structure and biome characteristics Several aspects are discussed to discuss the characteristics of the sedimentary facies and the distribution patterns of the sedimentary lithofacies confined to the sea-floor facies, the open sea facies facies, lagoon facies, biological facies, bio-reef facies and the basin. With a view to enhance the predictability of oil exploration, to provide some geological information.