碳酸盐岩礁滩相储层分类

研究以岩石组构、孔隙结构和岩石物性三者之间的相互联系为基础,按照岩石结构成因类型、优势孔隙类型、孔隙结构/物性分类进行多层次划分,将晚古生代以后的孔隙型礁滩相储层分为4大类、10小类,其中细－粗粒间溶孔的残余颗粒灰岩、细－粗晶间孔的残余颗粒云岩、非组构选择性溶孔的结晶碳酸盐岩是主要的优质储层类型,此种分类方法兼顾储层的地质成因模式与其自身特定的渗透性、弹性声波等物理属性,有助于改善储层类型的测井等地球物理手段识别效果,对碳酸盐岩礁滩相储层建模及评价具有重要意义.

Classification of carbonate reef-shoal reservoir rocks

Based on the relationships between rock fabrics and pore structure and reservoir petrophysical characteristics,carbonate reef-shoal reservoir rocks from the Late Paleozoic can be grouped into four broad categories and ten subcategories,successively according to genetic rock fabric types and dominant pore types,and pore structure/ petrophysics classifications.Among these reservoir rock types,the high-quality reservoirs mainly comprise residual grain limestones with medium-coarse interparticle pores,and residual grain dolostones with medium-coarse intercrystalline pores,and carbonate rocks with non-fabric selective dissolution pores.This rock-typing approach incorporates the geological genetic model and its own specific petrophysical properties including permeability and acoustic wave and electric conductivity,thereby helpful to facilitating the identification of reservoir rock types from various geophysical loggings,and fundamental to the modeling and characterization of carbonate reef-shoal reservoirs.