RESERVOIR CHARACTERIZATION OF GITA A AND GITA B, TALANG AKAR FORMATION, BANUWATI FIELD, SUNDA BASIN

• Main Author: Ginanjar, Asep
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/78469
• Institution: Institut Teknologi Bandung

Banuwati Field is one of gas producer fields in Sunda Basin. This field is still in early production phase, but gas production should be boosted to supply to PLN electric generator. In order to optimally develop the field, detailed understanding is needed on reservoir characterization of Gita A and Gita B sands which are the main reservoir in Banuwati Gas Field. The effort will also be supported by newly drilled well in the middle of the field. Reservoir characterization has been done on Talang Akar Formation, focused on Gita A and Gita B interval. Observation was started on core description to get facies associations, these associations then connected to Gamma ray log pattern so that it could be correlated to all wells. Furthermore, is the building of 3D facies association model using depth structure and net reservoir thickness maps for Gita A and Gita B intervals. Then, petrophysical models were realized using the base of facies association model. Porosity model utilizes the ELAN analyses curves which already has high similarity compared to core analyses values, distributed using a geostatistical method called Sequential Gaussian Simulation. Permeability model realized using transformation equations from porosity model. Relationship between core porosity and permeability were built with the base of facies associations interpretation. In conclusion, Gita A and Gita B reservoirs were deposited on fluvio-deltaic environment. Core and log data integration show each interval has bar and channel facies associations. Channel sands has the best reservoir quality with mean porosity and permeability values 22% and 640 mD respectively. Bar sands facies has mean porosity and permeability values 16% and 28 mD respectively.