Continuous Improvement Initiative to Optimize Reservoir Management in Carbonate Fracture Reservoir: Integrated GGRP in East Java Throughout Bali Area

Abstract

Carbonate rocks have been placed in emphasis for several studies in Indonesia because it is almost covering 60% of production basins in Indonesia; on the other hand, the fractured carbonate zones formed important oil and gas reservoirs. Those reservoir qualities were able to pronounce the sustainability of Indonesia's production for some period of time. Unfortunately, the heterogeneity of carbonate fractured reservoir widely known as the most unpredicted production performances. In Indonesia oil and gas upstream activities, it is often overlook when deal with the development scenario of carbonate field, furthermore to carbonate fractured reservoir. In fact of those, some lesson learn gained from previous approach of reservoir judgment was able to guide in how to better manage the development of those fields in Indonesia.Regional to detailed technical related aspect to develop carbonate fractured reservoir; involving Geology, Geophysics, Reservoir and Production (GGRP), are the primary important to be considered in order to gain understanding of the uncertainties from heterogeneities of those rock. History of carbonate rock environment depositional system in Indonesia is alongside with equatorial line throughout the geological time scale makes the location beneath Indonesia archipelago comprising with carbonate rock. The native characteristic of Indonesia archipelago became more complex by the support of subduction zone along the region. These complexities of geological condition create opportunities for upstream activities to develop those reservoirs, especially in East Java throughout Bali area.The initiation to optimizing the production on named area was conduct by integration of reservoir management using a guideline from previous overlook result, without creating pessimistic impression. Seismic relative amplitude processing was deliver to appropriate attribute, supported by geological data from well and each test. Analogy of data was not being used as a prominent data, but rather than a validation of methodology approaches, especially for petrophysics and modeling input. Petrophysics evaluation carried in this study uses an approach of fractured rock rather than possible interconnecting vuggy porosity. The relationship between matrix permeability and fracture permeability was modeled in dual porosity/permeability model; which supported the conclusion to geological condition of carbonate fractured reservoir in the area.