海相碳酸盐岩层系油气资源类比评价方法与参数体系——以塔里木盆地奥陶系为例

海相碳酸盐岩层系油气资源丰富。由于油气成藏与分布的特殊性，碎屑岩层系中建立的油气资源类比评价方法与参数体系不适用于碳酸盐岩层系。围绕有效储层这一控制碳酸盐岩层系油气资源分布主要因素，以塔里木盆地塔中、塔北隆起奥陶系为解剖对象，建立了有效储层体积丰度法和有效储层面积丰度法2种适应海相碳酸盐岩层系油气资源评价类比方法;开展了资源评价的参数统计，建立评价关键参数分布模型。通过对64项地质要素的解剖，确定了21项适用于海相碳酸盐岩层系油气资源评价的类比参数，并以此建立了塔里木盆地海相碳酸盐岩层系3种典型有效储层的类比参数体系及参数取值标准，为碳酸盐岩层系油气资源的类比评价奠定了基础。

Methods and parameter systems for analog assessment of petroleum resources in marine carbonate strata:a case study of the Ordovician in Tarim Basin, China

Marine carbonate strata contain abundant petroleum resources. However, previously established analog evaluation methods and parameter systems are not applicable to carbonate strata due to their accumulation and distribution characteristics. This study focused on the main controlling factor of petroleum resources in carbonate strata, i.e., effective reservoir. With the Ordovician carbonates in the central and northern Tarim uplifts as the study objectives, 2 methods were established for analog assessment of petroleum resources in marine carbonate strata, i.e., the effective reservoir volumetric abundance method and the effective reservoir areal abundance method. Parametric statistics of resource assessment was carried out and the distribution model of key assessment parameters was further established. Based on the analysis of 64 geological factors, 21 analog parameters were identified suitable for assessment of petroleum resources in marine carbonate strata. Accordingly, 3 analog parameter systems and parameter assignment standards were established for typical effective reservoirs in marine carbonate strata in Tarim Basin, providing a basis for analog assessment of petroleum resources in carbonate strata.