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以塔里木、四川和鄂尔多斯盆地蒸发潮坪白云岩储层、蒸发台地白云岩储层、埋藏白云岩储层和热液白云岩储层为例,系统阐述了白云岩储层储集空间的成因,指出原岩(石灰岩)特征和各种溶蚀作用主导白云岩储层储集空间的发育,并不是传统观点所认为的白云石化是重要的孔隙建造作用.蒸发潮坪白云岩储层的孔隙形成于表生期大气淡水对膏云岩中石膏及未云化灰质的溶蚀;蒸发台地白云岩储层的孔隙形成于表生期大气淡水对石膏及未云化文石或高镁方解石颗粒的溶蚀;埋藏白云岩储层的孔隙主要是对原岩孔隙的继承和调整,埋藏溶蚀作用对孔隙建造有一定的贡献;热液白云岩储层晶间孔可能形成于热液白云石化作用或是对原岩孔隙的继承和调整,晶间溶孔和溶洞形成于热液溶蚀作用.白云岩的分布与白云岩储层的分布不完全吻合,白云石化作用总能形成白云岩,但不一定是白云岩储层.蒸发潮坪白云岩储层侧向上分布于蒸发潮坪膏云岩带,带状或准层状分布,受相带控制,垂向上分布于向上变浅的蒸发潮坪旋回顶部(层序界面之下)的膏云岩中,多套叠置.蒸发台地白云岩储层侧向上分布于蒸发台地(盐湖)周缘及膏盐层之下,环带状及层状分布,受相带控制,垂向上分布于向上变浅旋回顶部(层序界面之下)的礁滩相白云岩、膏云岩中,多套叠置.埋藏白云岩储层侧向上分布于台缘或台内白云石化(交代或重结晶)的多孔礁滩相沉积中,受相带控制,垂向上分布于向上变浅旋回顶部(层序界面之下)的晶粒白云岩中,多套叠置.热液白云岩储层沿断裂、不整合面等热液通道呈准层状、透镜状分布.
Taking the evapotranspiration tidal flat dolomite reservoir, evaporating platform dolomite reservoir, burial dolomite reservoir and hydrothermal dolomite reservoir in Tarim, Sichuan and Ordos basins as an example, the genesis of dolomite reservoir space, It is pointed out that the dolomitization is not an important pore-building activity as the traditional viewpoints suggest that the porphyry in the evaporative tidal flat dolomite reservoir is formed in the Erosion of gypsum and non-cloud-like gray matter in the palygorskite during the ephemeral atmospheric freshwater period; the porosity of the dolomite reservoir in the evaporite platform was formed during the epoch-taking period with freshwater in the atmosphere dissolving gypsum and non-cloud aragonite or high-magnesium calcite particles; The burial dolomite reservoir pore mainly inherits and adjusts the original rock pore, and the burial dissolution contributes to the pore construction. The intergranular pores in the hydrothermal dolomite reservoir may be formed by the hydrothermal dolomitization or the original The succession and adjustment of rock pores, intergranular dissolved pores and karst cavities formed hydrothermal dissolution.The distribution of dolomite does not exactly match the distribution of dolomite reservoirs, and the dolomitization can always form dolomite , But not necessarily the dolomite reservoirs.The evaporative tidal flat dolostone is laterally distributed in the evaporimetic dipole dolomite zone, distributed in zonal or quasi-stratification, controlled by facies belt and vertically distributed in shallow upward The dolomite reservoirs in the evaporating platform are laterally distributed below the periphery of the evaporating platform (salt lake) and under the gypsum-salt layer, and the zonal bands and Layered, controlled by facies belt, vertically distributed in reef-shoal dolomite and apolitic dolomite distributed vertically at the top of the updrack (below the sequence boundary), and superimposed on each other. Lateral distribution of burial dolomite reservoirs In the dolostone (accountable or recrystallized) dolostone sediments in the platform margin or in the platform, the dolomite dolomite, which is controlled by the phase belt and vertically distributed at the top of the updraild (below the sequence boundary) Multiple sets of superimposed hydrothermal dolomite reservoirs along the fault, unconformity and other hydrothermal channels are quasi-layered, lenticular distribution.