Reservoir studies performed in the industry are currently moving towards an integrated approach. Most data available for this purpose are mainly from well cores and/or well logs. The translation of these data into the petrophysical properties, i.e., porosity and permeability, at interwell locations that are consistent with the underlying geological description is a critical process. This paper presents a methodology that can be used to achieve this goal. The method is validated through a field application.
The framework developed in this work starts with the given geological interpretation, i.e., facies and petrophysical properties, at well location. A new technique in evaluating the horizontal spatial relationship is provided. The technique uses the average properties of the vertical data to infer the low frequency characteristics of the horizontal data. Additionally, a correction in calculating indicator variogram, which is used to capture the facies' spatial relationship, is provided.
A new co-simulation technique to efficiently generate petrophysical properties consistent with the underlying geological description is also developed. The technique uses the conditional simulation tools of geostatistical methodology and has been successfully validated using the field data (sandstone and carbonate fields). The simulated geological descriptions matched well with the geologists' interpretation. All of these techniques are combined into a single user- friendly computer software that works on the PC platform.