摘要
The fracture-cave carbonate reservoir in Tahe Oilfield has strong heterogeneity,fractures and caves are developed,so quantitatively computing the porosity of matrix and fracture is the key for evaluating the fracture-cave carbonate reservoirs..The log interpretation model,which was composed by rock matrix bulk,matrix pore bulk,connected fracture-cave bulk and unconnected fracture-cave bulk,can simulate the parallel conduction network of matrix and connected fracture-cave as well as series conduction network of unconnected fracture-cave and matrix.We utilize the neutron and density log data to calculate the gross porosity,acoustic data to calculate matrix porosity,combined with LLD and LLS resistivity to calculate the pore bulk of connected fracture-cave and unconnected fracture-cave.The calculated three pore components are applicable for all kinds of reservoir combinations,and can be used for judge the effectiveness of reservoir.The favorable reservoir by using this method is matrix pore and connected fracture-cave as well as porecave -fracture combination.