Reservoir Characteristics and Comprehensive Evaluation of Mesozoic Clastic Reservoirs in Chengdao Region

This paper studies rock characteristics,diagenesis,reservoir spaces and main control factors of Mesozoic clastic reservoirs in Chengdao region by means of core observation,thin-section and physical property analysis.Results indicate that the Mesozoic clastic reservoirs have experienced strong compaction pressure solution,replacement,dissolution and packing action as well as crack formation.There exist two main reservoir spaces of dissolution pores and fractures.The reservoirs are controlled by sedimentation,diagenesis and tectonic effects,among which deposition is the main controlling factor,followed by tectonism,and diagenesis is the minimum.Consideration of sedimention,tectonism and diagenesis,the Mesozoic clastic reservoirs have been divided into four types,of which typeⅠis the best,followed by type Ⅱ1,Ⅱ2 and Ⅱ3,and type Ⅲ and Ⅳ are the lowest porosity and permeability reservoir.