Gas Reservoir Identification And Prediction Of Xishanyao Group Of Hongtai Gas Field In Turpan Hami Basin

Xishanyao group is a potential expansion layer of Hongtai gas field in Turpan Hami basin.The distribution,reserves,scale of gas reservoir is not clear,which seriously restricting the formulation of development policies in this area.Therefore,it is urgent to recognize where is the gas and oil reservoirs and predict its distribution in this area.In count of the above problems,making full use of the geological and geophysical and production test data in this study,first established the accurate stratigraphic framework to the level of small layer.Under constraint of the stratigraphic framework,sand body distribution are predicted in space by using seismic attributes analysis,seismic wave impedance inversion and geostatistical inversion methods.Sedimentary facies distribution of all layers in Xishanyao group is determined under the guidance of shallow water braided river delta depositional model.Then using the method of SVM completed the interpretation of porosity,using the idea of the flow unit finished the permeability interpretation,using nuclear function for the identification of fluid.Finally,according to the main controlling factors of oil and gas reservoirs they are divided to two main kinds: fault block oil and gas reservoir and structural-lithologic gas and oil reservoir.There is no uniform oil-water interface in the oil and gas reservoir of a layer.Instead,it shows the typical characteristics of "a sand reservoir".The main oil and gas reserves of Xishanyao Formation are calculated by the sedimentary facies and logging interpretation results,which contain proved natural gas reserves 6.682×10~8m~3,predict natural gas reserves 22.291×10~8m~3,proved oil reserves 217.2×104t and prediction of oil reserves 380.8×104t.Through this study,two of three suggested well drilled oil and gas reservoirs,new proven oil reserves of 66.7×104t and natural gas reserves.