An Integrated Study of Low Permeability Reservoir in the Bekasap Field, Central Sumatra Basin, Indonesia

摘要

An integrated geological study has been performed for a large, mature field at the Bekasap and Menggala formation. The primary goal of the study was to developed an integrated reservoir description for targeted infill drilling and improve recovery in a low-permeability reservoir. Integration of geological and petrophysical studies and reservoir performance analysis provided a rapid and effective method for developing a comprehensive reservoir description. A 3D geocelluar model of reservoir architecture and properties distribution was made and used as a guide to further development. This model delineates distinct trends of estuarine, sand ridge, and margin facies throughout the field that reflect paleogeography. Additionally, reservoir properties and saturations were geostatistically populated within the model. Horizontal wells were chosen as the preferred alternative to provide maximum exposure of reservoir layers and improve production and ultimate recovery compared to conventional vertical wells or frac jobs. Thirty one (31) horizontal wells were drilled in the Bekasap field, and this program was very successful and predicted ultimate recovery has improved from 14% to 28%. The study of this low permeability reservoir in the Bekasap field is an excellent opportunity to: (1) demonstrate the economic importance of this zones, (2) understand the methodologies required for identifying and evaluating these pay types, and (3) help the company to find additional reserves in the Central Sumatra Basin.