Study In Logging Interpretation And Evaluation Of The Intermediate And Basic Volcanic Reservoir In Anda Area Of Songliao Basin

Aiming at the difficulties in interpretation and evaluation of the deep-zone intermediate and basic volcanic reservoir of Anda area of Songliao basin, Based on the lithologic identification, the classification of intermediate and basic volcanic reservoir by its composition is improved. Its application in logging data of 13 wells proved an actual lithologic coincidence rate of 93.1%. Based on the data from rock analysis, model well, and conventional logging, a method of matrix porosity and permeability calculation for volcanic reservoir is set up, and its application proved the mean absolute error of 1.1%,and mean relative error of permeability of 53%. On the basis of imaging logging, a method of fracture porosity quantitative calculation is proposed. According to heterogeneous rock theory of quantitative calculation of saturation, electrical property experiments, nuclear magnetic resonance experiments, and numerical simulation on full-diameter drilling core under the simulated formation conditions, the conduction mechanism of intermediate and basic volcanic reservoir is determined and a dynamic saturation calculation model is established in accordance with the type of pore structure. Its application in processing logging data of 15 wells resulted in an accuracy of 87.5% according to the actual well testing. Moreover, both of the interpretation chart of gas-water layer and the flow chart of interpretation and evaluation for volcanic reservoir are established, and the identification method for fluid property is proposed. Practical application has proved a well bettered block interpretation accuracy. All the above-mentioned technology has made a breakthrough in hydrocarbon exploration in our research region, and can also be a guide to volcanic or carbonate reservoir logging interpretation of other district of our country.