Publications

Discoveries made in fractured basement reservoirs in the South Sumatra Basin over the last few decades, namely some world class fields such as Suban, Sumpal and Dayung, have opened up the potential of this play. The complexity of the fractured basement is the main challenge for proper reservoir characterization. Exploration of this particular play requires a carefully plan of execution in order to optimize the intersection of faults or fracture sets. This study utilizes 3D seismic attributes to understand fracture orientation and fracture density within the basement, with correlation from latest well data. The analysis starts by removing various coherent noise due to acquisition footprint and seismic merging, this improves the dynamic range of the subsequent attributes. Using the ‘Automated Fault Extraction (AFE)’ workflow, a Horizon Edge Stack (HES) attribute, without structural-oriented filtering, illuminates the geomorphology while HES with structural-oriented filtering reveals overall architecture of the fracture/joint system. The discontinuity value of the HES attribute are further organized in the direction of strike and dip to create a new attribute which allows auto extraction of fault planes within the entire 3D seismic. Well markers interpreted from FMI logs justify the interpretation. The extracted fault/fracture planes provide information to define the “sweet spot” for future drilling of exploration or appraisal wells.