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系统分析世界上已公开发表的白云岩储层资料表明,大多数产油气白云岩储层出现于:(1)以潮缘带为主的碳酸盐岩;(2)与蒸发潮坪/泻湖有关的潮下碳酸盐岩;(3)与盆地蒸发岩有关的潮下碳酸盐岩;(4)与地形高点/不整合面、台地边缘建造或断层/裂缝有关的非蒸发型碳酸盐岩中。不同类型白云岩的储层特性变化很大,这取决于原始沉积组构、白云岩的形成机理以及早成白云岩被后白云化成岩作用改造的程度(如岩溶作用、裂缝作用、埋藏溶蚀)。本文讨论白云岩的孔隙成因,并举例说明不同类型白云岩的孔隙度演化和储层特征。
Systematic analysis of dolomite reservoir data published in the world shows that most of the oil-producing dolomite reservoirs occur in: (1) carbonate rocks that are mainly tidal zones; (2) with evaporative tidal flats / lagoons Related subtidal carbonate rocks; (3) subtidal carbonate rocks associated with evaporites in the basin; (4) non-evaporable carbons associated with topographic / unconformity surfaces, or fault / In acid rock. The reservoir characteristics of different types of dolomites vary greatly, depending on the original sedimentary fabric, the formation mechanism of dolomite and the degree of remolding of dolomite in the early dolomite (eg, karstification, fractures and burial dissolution) . This paper discusses the pore genesis of dolomites and illustrates the porosity evolution and reservoir characteristics of different types of dolomites.