Detailed Geological Model of Carbonate Reservoir Based on Geostatistical AVA-inversion - A Case Study

The goal of reservoir characterization is to draw inferences about the petrophysical properties of the reservoir (porosity, permeability, saturation, etc.) on the bases of geological assumptions about the character of the subsurface, together with the evidence from seismic and well log data. The geostatistical inversion is a modern and one of the most effective tools for such purposes. This study demonstrates how geostatistical AVA-inversion workflow was used to obtain reservoir properties and risk assessment of the Lekharyaga prospect area. The main target of this region was Lower Permian siliciclastic-carbonate oil reservoir. Recent results of geostatistical inversion of prestack seismic data now indicate spatial distributions of effective porosity and permeability within the target interval. Based on our investigation an adjustment of the production drilling scheme was performed.