Publications

Part of the efforts to fight gas production decline in the Mahakam PSC of Kutai Basin, include the redevelopment of the Handil Field Deep Zone interval (depth 2700-3300mSS), comprising mainly distributary channels deposits. A comprehensive evaluation is required to obtain more realistic reservoir model in matured Handil field. With the lack of available quality seismic data, iteration between sedimentological concept and dynamic evaluation was the adopted approach to model the reservoir. The previous existing model was in 2D, netsand maps were drawn freehand systematically using a width thickness ratio of 1:80 based on study done by Mercier and Allen (1985). Dynamic evaluation on many of these dry gas reservoirs later on reveals that initial connected gas in place volumes are underestimated. In this case the ratio applied to create channel boundary being one of the main uncertain parameter in reservoir modeling process. The aim of this paper is to propose a methodology to build a 3D reservoir model, respecting both sedimentological concept and the dynamic behavior of the reservoir. This paper presents a case study in one of the reservoirs in Handil Deep Zone, where the recovery factor is still relatively low. Part of static - dynamic reconciliation is to create channel boundary driven by dynamic connectivity between wells. One of the results after using this new methodology in particular reservoir is to apply a width to thickness ratio of 1:120 in reservoir modeling process, allowing to increase the width of the sand body through the west side of the field and providing new opportunities for possible infill wells in the future.