Research On Reservoir Characteristics Of Shanshan Oil Field

By using the theories and techniques of reservoir geology, modern sedimentology, sequence stratigraphy, reservoir evaluation and reservoir inversion to thoroughly research the feature of lithology, the distribution of sand body, lithogenesis types and the feature of reservoir rooms ,depositional system and reservoir classification for San jianfang formation and Qi ketai formation of Shan shan oil field.Optical indentification data shows that the main composition on the upper part of San jianfang formation is medium sand and fine sand.The lower part is mainly composed by medium sand,gritstone and glutenite.The maturity of composition is totally low. The porosity and the permeability of the reservoir are low.The main composition of Qi ketai formation is siltstone and fine sand,whose maturity of composition is low.The tight lithogenesis is typtcally to the target stratum such as compaction , pressolution and cementation.At the same time,dissolution,compaction and tectonic disruption improve the feature of the pore structure of the reservoir which is in the unstable acidic enviroment .There are primary pore,secondary poresand fracture in the reservoir. Secondary pores and fractures give priority to the target stratum.The original intergranular give priority to remnant primary pores,intergranular corroded hollow,intragranular corroded hollow, intergranular pore and intragranular pore form the secondary poresand.Moreover,there are intercrystal pore,moldic pore ,super big pore,structure fracture and microcrack.On the basis of former people's research,we start from sedimentary structure,sedimentary rhythm and electrofacies to classify sedimentary facies and sedimentary microfacies,moreover analyse the distribution of each single sand body of the target stratum.Getting the model of the relationship between porosity and permeability by building the model of reservoir property,so that do spade work for numerical reservoir simulation after coarsening.By classifying the low seepage reservoirs of Shanshan oilfield for single factor,we divide the goal oil layers into three kinds as kindⅠ, kindⅠ, kindⅠ. 452 wells carry on the oil layer classification appraisal of the studied area.