In order to solve the problem of unclear understanding of Ordovician buried hill reservoirs in northern Jizhong depression, on the basis of core observation, the basic characteristics, genetic types and main controlling factors of reservoirs in this area were studied by using drilling, well logging, analysis and laboratory data, etc. The results show that 4 sets of dolomite pore type and 1 set of karst fractured-vuggy type reservoirs are developed in this area. Lithology is mainly micritic-powdered crystal dolomite and calcareous dolomite, followed by micritic limestone. The reservoir space mainly includes intercrystalline (dissolution) pores, structural fractures and dissolution pores, etc. Through the study of the basic characteristics of the reservoirs, it is confirmed that the formation of favorable reservoirs is mainly controlled by factors such as rock type, fracture development degree and karstification intensity; rock type is the basis for controlling reservoir formation; fracture development degree is the key to restrict reservoir formation; karstification intensity controls reservoir advantages and disadvantages. Based on this, three reservoir development models of Ordovician in the northern Jizhong depression are established, namely, regional stratified model, regional massive-stratified composite model and local massive model, which provides basis for the establishment of reservoir-forming models and exploration deployment.
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