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在岩溶型储层中,深埋白云岩储层储集空间的形成与水-岩反应密切相关,分析水-岩反应机理是揭示白云岩储集空间形成条件的基础。以鄂尔多斯盆地下古生界马家沟组白云岩储层的多口钻井岩芯为研究对象,综合利用扫描电镜、电子探针等手段,研究矿物、岩石的物质成分和结构,观察溶蚀孔隙和充填的次生矿物。再根据流体包裹体测温确定水-岩反应的温度。研究认为:鄂尔多斯盆地下古生界马家沟组白云岩储层水—岩反应相关的主要成岩作用有准同生白云石化作用、溶蚀作用、矿物充填作用和压实-压溶作用。
In karst reservoirs, the formation of deep-buried dolomite reservoirs is closely related to water-rock reactions. Analyzing the water-rock reaction mechanism is the basis for revealing the formation conditions of dolomite reservoir space. Taking the multi-well core in the dolomite reservoir of the Lower Paleozoic Majiagou Formation in the Ordos Basin as the research object, the composition and structure of minerals and rocks were comprehensively studied by means of scanning electron microscope and electron probe. The dissolution porosity and Filled secondary minerals. The temperature of water-rock reaction is determined according to the temperature of the fluid inclusions. It is concluded that the main diagenesis related to water-rock reaction in the Lower Paleozoic Majiagou Formation dolomite reservoir in Ordos Basin are quasi-syngenetic dolomitization, dissolution, mineral filling and compaction-depressurization.