Publications

A Basement-fractured reservoir is one of the main exploration targets in the Sumatra Back-Arc Basin specifically in the South Sumatra Basin (SSB) area. This type of reservoir has been known for many years as one major contributor in overall oil and gas production in the South Sumatra Basin, Central Sumatra Basin, Northwest Java Basin and Barito Basin. Most of the basement-fractured reservoirs consist of amalgamated rocks with various lithologies such as granite, andesite, marble/limestone, quartzite, phyllite/schist and a wide range of meta-sedimentary rocks. Fractures are observed in all lithologies with several degrees of complexity of both orientations as well as pattern between areas. Therefore, understanding fracture distributions in time and space is very important as well as identified major fractures orientation that act as the primary permeability. Most of the workers rely on image log data (i.e. FMS, FMI, EMI etc.) as the main source of fracture characterization and mapping. Additionally, seismic attributes such as ant-tracking techniques in some cases can be very helpful in determining high fracture density and intensity zones. However, in order to distribute fractures in 3D, one must know information about the fractures attributes in detail as well as their characteristics such as geometry, spacing and cross-cutting. Those parameters are difficult to determine from the exploration wells and the seismic data. In this study, we demonstrated that by using integrated outcrop fracture characterization, geomechanics and subsurface data analysis, we are able to generate better understanding in terms of fractures behaviors in the rock volume. In addition, our work shows that such additional works will help in generating better 3D fracture modeling.