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The Lower-Middle Ordovician carbonate reservoirs have been recognized as the most important strata in terms of oil and gas exploration in NW Tazhong Uplift, Tarim Basin, China. Intercrystalline porosity, vugs, and fractures were preferentially developed in the dolostone intervals, and understanding the processes of dolomitization is therefore crucial for the prediction of the connectivity and spatial distribution of reservoir quality. Two major types of replacement dolomite (RD1 and RD2) were identified based on fabrics and textures: RD1 dolomite is light gray in hand specimen with porous sucrosic texture and partially preserved precursor lithologic texture. Microscopically, it consists of fine-...

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