Reservoir characterization in Leming Lake, Alberta

John Jianlin Zhang, Laurence R. Bentley

This paper integrates well logs and lab measurements with seismic data to create a reservoir characterization model. The reservoir is located in Leming lake, Alberta, and ranges in depth from 410 m to 470 m approximately. It is characterized in well logs by low Gamma ray, low spontaneous potential and high electrical resistivity. The top and bottom picked in well logs demonstrate a relatively flat surface with regular geometry. The porosity obtained from core measurements and porosity logs clusters around 30%- 40%. A small number of extremely low or zero values were found to come from strongly cemented limy sands or limestones. These tight rocks have a thickness around 2-3 m and appear to be irregularly distributed both vertically and horizontally. The reservoir framework is consequently viewed as a relatively homogeneous sand with irregularly spaced tight zones. Their occurrence was modeled with the universal Kriging. This conclusion is supported by seismic data acquired in a part of this area. Seismic reflections in the reservoir time window appear to come from tight rocks, which enabled us to find the details of these tight rocks and to establish a better reservoir characterization model.