A Calculation Method of Deep Tight Reservoir Saturation Based on Acoustic Parameters and Pore Structure Classification
Deep tight reservoirs present intricate geological conditions,posing challenges in accurately calculating gas saturation.To address the issue,the structural belt of northern Kuqa in Tarim Basin is taken as an example.Based on the theories of rock conductivity and acoustics,using petrophysicaltesting methods and data analysis tech-niques,combined with mercury intrusion porosimetry and nuclear magnetic resonance data,the reservoirs are divid-ed into four categories based on their pore structures.According to the parameters of rock fractures,the relation e-quation between water saturation and acoustic parameters at different conditions of pore structures is established.An innovative saturation calculation model based on acoustic parameters and pore structure classification has been de-veloped.According to the research results,compared with Archie equation of electrical petrophysical variations in rocks and Gassmann-Wood saturation equation,the simulator better matched with the test data.This method has proven to be feasible.The method provides a new approach to calculate the saturation of deep tight reservoirs using non-electric logging data,and promote efficient exploration and development in deep tight gas reservoirs.
deep tight reservoirwater saturationacoustic parameterspore structureGassmann-Wood equation
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