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以沾车地区沙四段碳酸盐岩为研究对象,在沉积环境分析的基础上,提出了研究区沙四段湖相碳酸盐岩3类亚相9种微相的分类方案,即研究区湖相碳酸盐岩可分为灰礁、灰滩和灰泥3种沉积亚相。其中灰礁亚相根据发育构造部位可划分为盆缘断阶型、坡折带高能型和斜坡高部位型3种类型,并可细分为礁核、礁缘、礁前、礁后和礁间水道5种微相;灰滩和灰泥亚相可分为滩核、滩缘、滩间水道和浅湖灰泥4种微相。通过统计分析可知,灰礁亚相储层物性较好,其中礁核、礁间水道微相储层物性最好,其次是礁前、礁后和礁缘微相;灰滩亚相储层物性中等,其中滩核和滩间水道微相储层物性相对较好,滩缘微相储层物性较差;灰泥亚相储层物性差。
Based on the analysis of sedimentary environment, the classification scheme of 9 types of microfacies of the 3rd subfacies of the Member 4 of the Shahejie Formation in the study area is proposed. The lacustrine carbonate rocks can be divided into three types of sedimentary subfacies: gray reef, limestone and stucco. Among them, the Reef sub-facies can be divided into three types, ie basin margin fault type, slope break fault high energy type and high slope type according to the developed tectonic parts, and can be subdivided into reef core, reef edge, reef front and reef and reef Five kinds of microfacies in the inter-waterway. The limestone and stucco subfacies can be divided into four kinds of microfacies, such as beach core, beach margin, inter-bank waterway and shallow lake stucco. By statistical analysis, we can see that the properties of the Reef subfacies are better, of which the reef core and reef microfacies are the best, followed by the reefs, reefs and reef microfacies; Medium, in which the physical properties of the facies microfacies of the beach core and the inter-bank waterway are relatively good, and the physical properties of the beach margin microfacies are poor; the properties of the stucco subfacies are poor.