Publications

Western Indonesia fore-arc basins are poorly understood. Their hydrocarbon potential being marked low prospects, - data acquisition has been limited. In 2016, M3nergy drilled an exploration well in Fore-arc basin, Southwest Java. The primary target being the Bayah – Ciletuh formation comprised of shallow marine to deltaic depositional environments. This formation is expected to be tectonically affected with laminated thin beds and low permeability. Natural fractures are the tectonic and structural historical sub-surface imprint, which are traditionally distinguishable through high resolution borehole images. A quantitative fracture characterization process is conducted with additional sonic Stoneley, borehole acoustic reflection survey and stress inversion measurements. This additional information allows the user to build a more accurate discrete fracture network model supporting reservoir production optimization. Laminated thin beds presence -with low permeability formations is difficult to characterize with conventional open-hole logs. An accurate thin bed evaluation is conducted through the combination of open-hole logs, high resolution borehole image, and new generation wireline formation tester (WFT). Fractures are well developed over the entire interval. High density, conductive fractures and faults were identified, showing mainly NW-SE with minor NE-SW and E-W strike. Sonic Stoneley fracture and borehole acoustic reflection survey data identified open fractures propagating up to 60 feet from the wellbore, with sonic inversion showing a N 76deg E maximum horizontal stress direction. Laminated thin beds are observed over the shale-sand intervals. The evaluation from high-resolution logs along with WFT mini-DST results shows the presence of thin sands with porosity ranging from 8% to 12% and permeability ranging from 0.1 to 20 mD.