Publications

PT Pertamina (Persero) DOH Kalimantan has embarked on development of almost virgin South Eastern area of Sangatta Field. The wells test results showed additional untapped reserves in this part of the field encouraging further development of this area. Oil based mud system is used in current development drilling of this area in order to improve drilling performance and borehole stability that necessitated change of the logging program. In addition to the basic logging suites and due to the complexity of the remaining reservoir facies spatial distribution, PT Pertamina DOH Kalimantan acquired Oil-Base MicroImager (OBMI) data to help guide in the development of this virgin part of the Sangatta field.Good quality OBMI data were obtained for detailed sedimentary and reliable structural dip data in OBM environment, allowing geologic facies analysis and accurate spatial distribution interpretation of the reservoir. In this Sangatta fluvio-deltaic environment of deposition, the OBMI image data along with the conceptual geologic model allowed very good control in mapping the architecture of the reservoir facies.In this joint paper, a case study of OBMI data will be presented demonstrating the methodology and results of comprehensive approach to sedimentological interpretation of borehole image data using the OBMI and relevant other subsurface data.