Publications

Gunung Kembang field (GK) is located in the South Sumatra Extension Block, and is operated by PT Medco E&P Indonesia. The field has been producing since 1988 with cumulative production of 3.8 MMBO. However, its recovery factor is low (<, 10%) due to reservoir complexities. The challenge is heightened as the oil column is only 40 ft thick over an underlying gas cap with thickness reaching 120 ft. The driving mechanism, a strong gas cap drive with weak aquifer support, created difficulties in controlling produced gas. The presence of a Baturaja carbonate reservoir is clearly identified from 2D seismic sections, in addition to samples obtained from cores, side wall cores and cuttings. Currently there are 10 wells, consisting of several verticals, and horizontal wells and pilot holes. The first tested interval from GK-1 well with choke 24/64 was 302 bopd, water cut 0.1%, and GOR 4800 scf/stb. Several studies have been carried out at GK field with subsequent drilling failed to yield anysignificant increase in the recovery factor. This paper presents results of a new study with more comprehensive data and details on all reservoir aspects. The paper contains preparation data, QC processes and integrating core and log data. In addition, a carbonate depositional environment study, a seismic interpretation, a petrophysic analysis, fluid analysis, material balance and history matching were carried out. Each process is then coordinated to evaluate reliable reservoir characteristics. At the end, a geological model and reservoir simulation were built to run optimal scenarios for improvement in the recovery factor. One of the key points from the study is a landing position of proposal for a horizontal well based on a reservoir simulation and empirical data.