Reservoir Gross Rock Volume Estimation of a Gently Dipping Structural Trap, Using Geostatistical Time-Depth Conversion Method

Summary Over decades in the Oil&Gas Industry, interpreting seismic data has been routinely used to determine geometries and volumes of hydrocarbon reservoirs. The accumulated knowledge and experience could be applied to characterize other underground reservoirs where hydrogen and/or helium are trapped. This work is the application of interpreting seismic data for characterizing the geometry of a helium reservoir in a gently dipping structure. Up to gross rock volume (GRV) assessment, a similar approach would be suggested to a hydrogen-prone reservoir assessment. Time-to-depth conversion of two horizons was done using a geostatistical method, called kriging with external drift, a multivariate method for depth modelling conditioned to the observed markers in the wells as well as the picked horizons in the time-domain, conformed to interpreted faults. Using geostatistical simulations, the structure geomorphology is modelled probabilistically. Based on which potential spill-points are retained, the Gross Rock Volume (GRV) is calculated and expressed by P10, P50 and P90.