2D Seismic and Well Log Data Integration to Predict Pore Pressure Distribution in Brilian Field, Bintuni Basin

Abstract

Accurate pore pressure prediction in drilling activities supports the safety and economic aspects of avoiding loss, kick, or blowout. This is more so when the drilling is carried out in limestone lithology with various pore pressures in the same formation. Bintuni Basin is one of the productive basins in Eastern Indonesia, with limited pore pressure predictions in the Steenkool Formation. Brilliant Field in Bintuni Basin has been actively producing hydrocarbon from limestone lithology in the Kais Formation since 1981, with the least pore pressure prediction. Integration of 2D seismic data and well data has been carried out to obtain more accurate pore pressure distribution in Kais Formation, Brilian Field, Bintuni Basin. Pore pressure prediction uses Eaton's empirical approach to the relationship between formation resistivity values and pore pressure to depth. Prediction of 1D pore pressure in wells R-3, R-4, R-5, and RD-1 shows that the pore pressure distribution tends to be hydrostatically normal, which is validated by plotting mud weight data, drilling events, and gas readings for each well. 2D seismic and well data integration results show that high porosity is randomly distributed due to the dolomitization process and aragonite dissolution. Meanwhile, low porosity values are associated with thin shale and clay lithology that spread laterally at the top of Kais Formation due to transgression and overflow from the Sekau Reefal zone. Pore pressure distribution based on integrating 2D seismic data and well data in the Kais Formation, Brilian Field, Bintuni Basin laterally tends to be homogeneous. It normally increases with increasing depth in terms of no indication of a drastic increase or decrease in pressure values.