Objective The dissolution and precipitation of carbonate during burial diagenetic process controls the reservoir property in deep buried strata.The geological process related with it has become a research focus during recent years.The most important dissolution fluids to carbonates are probably H_2S and CO_2 as byproducts of sulfate reduction in deep-buried setting with sulfate minerals,but carbonates are more soluble in relatively low temperature,which is the so-called retrograde solubility.Several geological processes can result in the decrease of temperature,including the upward migration of thermal fluids and tectonic uplift.The Ordovician strata in the Tahe oilfield of the Tarim Basin Objective The dissolution and precipitation of carbonate during burial diagenetic process controls the reservoir property in deep buried strata. Geological process related with it has become become research focus during recent years. Most important dissolution fluids to carbonates are probably H_2S and CO_2 as byproducts of sulfate reduction in deep-buried setting with sulfate minerals, but carbonates are more soluble in relatively low temperature, which is the so-called retrograde solubility. Selenium geological processes can result in the decrease of temperature, including the upward migration of thermal fluids and tectonic uplift.The Ordovician strata in the Tahe oilfield of the Tarim Basin