Georesursy (Sep 2020)
Petro-elastic modeling deliverables for the Kharyaga Permian carbonate deposits
Abstract
The purpose of this study is petro-elastic modeling of the Permian deposits occurring in the Kharyaga field, which is located in the Nenets Autonomous District of the Arkhangelsk Region and is confined to the Timan-Pechora Oil and Gas Province. The formations concerned are represented by the Artinskian and Asselian-Sakmarian deposits, which are mainly composed of carbonate sediments admixed with terrigenous material. At the first stage of the petro-elastic modeling, the initial data quality is evaluated, candidate wells are selected, logging curves for the target formation intervals are adjusted and normalized. After that, a comprehensive interpretation of the well logging data is carried out; reservoirs are identified; porosity and oil saturation are evaluated. At the next stage, a petro-elastic model is built, and analysis is carried out in order to understand whether or not reservoirs can be identified and to evaluate a saturation type within the range of elastic parameters. In such case, the elastic model is selected as a function of sedimentation and diagenetic processes, saturating fluid content, etc. As a result of the modeling process, reservoir/non-reservoir zoning was identified based on acoustic and shear impedance; a relationship between the acoustic impedance and porosity was also established. No correlation between the elastic parameters and the saturation type has been established, which may be attributable to hardness of the carbonate matrix and similar elastic properties of oil and water.
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