Quantitative Log Evaluation Method for Volcanic Reservoir in Santanghu Basin

In Santanghu basin,it is difficult to quantitatively evaluate the volcanic reservoirs since lithology and porosity structure is complex and reservoir resistivity is impacted by background resistivity.For simplifying lithologic identification,physical property and saturation calculation,proposed is a set of quantitative evaluation methods: Volcanic rock structure feature is extracted from electricity images using imaging processing technology;Combining with normal logging data,lithology is identified with SVM(Support Vector Machine)method in multidimensional space;On the basis of the mixed matrix model and complicated porosity structure model,it can evaluate block porosity,fracture porosity and permeability,etc.The saturation equation of eliminating background electric conduction is used to calculate oil saturation of the heterogeneous volcanic reservoir with complicated porosity structure,and to eliminate influence of the background resistivity;and non-conduction water saturation is obtained from fracture porosity reservoir resistivity model.