Depositional and Diagenetic Controls on Reservoir Quality of Callovian-Oxfordian Stage on the Right Bank of Amu Darya

Based on the detailed analysis of sedimentology, diagenesis, and petrophysics, this study characterized Middle-Lower Jurassic Callovian-Oxfordian carbonate reservoirs 68 key wells in Amu Darya Basin assessed controlling factors quality target intervals. We identified 15 types sedimentary facies developed seven environments using analysis, such as evaporative platform, restricted open platform margin, fore-edge upslope, downslope, basin facies. The intervals went through multiple diagenetic stages, including syndiagenetic stage, early middle all which had a significant impact reservoir quality. Main processes include dissolution fracturing improve well cementation, compaction, pressure solution that reduce By analyzing quality, we nine fluid flow units five Among them, dissolved grain-dominated is highest best storage body, while microporous mud-dominated downslope marine lowest could not become unit unless it was by fracturing.