Publications

The Oligo-Miocene carbonate interval is the major reservoir in North Madura Platform, East Java Basin. The interval comprises the CD and Kujung Carbonate, which have highly heterogonous reservoir properties reflecting the combination of facies variation, diagenetic effects and tectonic imprint. Natural fractures are perceived to have an important control on porosity and permeability in carbonate reservoirs. However, small-scale faults/fractures are not captured at the resolution of the current seismic. Therefore, forecasting the impact of fractures depends on observations from wells, spatial/statistical analysis and forward modelling. In this paper we demonstrate the use of Elastic Dislocation (ED) modelling. The ED method is based on physics and geomechanics, it can be very effective for the estimation of the localized, three-dimesional, strains and stresses in the vicinity of seismic scale faults from which it’s possible to further predict the density, trends/orientations and types of natural fractures. Validation of model-results is based on comparisons between predicted fracture characteristics and real observations from image logs in several wells. The geological history of the North Madura Platform area indicates that hydrocarbon generation, migration, timing and trapping depend heavily on tectonic events. These events are inevitably associated with fracture generation. Here we use the geological/tectonic history to drive fracture-generation models that ultimately predict the areas with highest potential as exploration targets.