3D Elastic-Electrical Rock Physics Template Inversion for Reservoir Parameters of Gas Hydrate Bearing Sediment

Summary Successful evaluation of reservoir resources generally depends on the accurate estimation of reservoir parameters. Elastic and electrical measurements are sensitive to different rock properties and their joint interpretation can provide complementary information and improve the accuracy of characterization results. In this study, we propose a 3D elastic and electrical rock physics template to estimate reservoir parameters from elastic and electrical data. First, we conduct a quantitative analysis of the available well log data and core data to understand the morphology of gas hydrate within the marine sediment, and calibrate the corresponding elastic and electrical rock physics models to link reservoir properties to geophysical attributes. Then, we can generate the 3D rock physics template with calculating the response of each node meshed by reservoir parameters. Then, the prediction of reservoir parameters can be obtained by using the grid search method. Finally, we apply this approach to the well logs measured at site 1328C, Cascadian Margin. The comparison between inversion results and the core data shows that the proposed inversion scheme is applicable to real data and allows combining elastic and electrical data for reservoir parameter estimation of gas hydrate bearing sediment.