| The Kelimoli Formation of western Ordos Basin is quite promising in the exploration of Lower Paleozoic of the Ordos Basin.The study of its sedimentary characteristics and reservoir has important significance for exploration.This thesis mainly uses field outcrop profile observations,drilling coring and observation of outcrops,rock thin section and rock test analysis data,and seismic,logging,logging and test data.A more detailed division of the strata is presented,the main types of sedimentary microfacies are systematically summarized and a corresponding sedimentary facies model is established.What's more,based on the study of reservoir characteristics and genesis,the main controlling factors of reservoir development is fully analyzed.This thesis proposed that Kelimoli Formation can be divided into three members vertically.Member one mainly composed of argillaceous banding mudstones.Kelimoli Formation mainly develops open platform facies,mesa facies,slope facies,deep water shelf facies,and deep water facies.It would be quite helpful for the following study of reservoir and further development.This thesis believes that reservoir is mainly developed as karst fracture-cavity reservoir and dolomite reservoir.Karst fracture-cavity reservoirs are mainly controlled by karstification and distributed on karst slopes within the facies of the slope and platform margins.The dolomite reservoirs are mainly controlled by sedimentary faces and burial dolomization,and are mainly distributed in the granular beach belt and fracture-developed area.The study of controlling factors of reservoir is the base of forecasting potential reservoir and could be a guidance of the following development of Kelimoli Formation. |
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