Publications

The identification and characterization of stratigraphic traps and facies are critical for effective hydrocarbon reservoir development. LN Field, a mature field in South Sumatra, has been producing since 1952. Separated into LL and NR segments, the field now experiences high water cut, with most conventional reservoirs such as the Baturaja and Talang Akar Formations already explored. To sustain production, advanced recovery techniques like waterflood projects are necessary. This study focuses on the Gritsand Member of the Talang Akar Formation, leveraging integrated geological and geophysical methods to evaluate potential layer with high oil in place. Geological analysis incorporates regional geological data, biostratigraphy, core descriptions, and well log correlations to establish depositional framework and create isopach maps. Geophysical techniques enhance this interpretation through spectral decomposition with RGB blending for stratigraphic trap identification, seismic inversion to delineate facies. Frequencies of 13, 15, and 20 Hz were used in spectral decomposition to generate RGB visualizations for structure identification. Seismic inversion, conducted using post-stack model-based methods, provided poor result of sand-shale differentiation. RGB blending identified 16 distinct major faults, critical for structural modeling. Furthermore, using different range of frequencies namely 13, 30, 40 Hz to map the facies deposition in order to characterize more clearly about the facies. Geological data validated these findings, with well logs indicating fluvial depositional environments for the target sands and core descriptions confirming cross-bedded shale features. This integrated approach provides a detailed facies distribution and fault network, forming a robust foundation for initiating waterflood projects in LN Field, ensuring optimized field development.