Publications

This paper describes the result of structural modelling and possible reasons for anomalous production decline experienced by several wells in Meruap Field in the northern area of Jambi Sub-Basin, South Sumatra. The Air Benakat Formation (ABF) reservoirs are Middle Miocene age ― also known as Lower Palembang Formation. Since 1990, a total of 65 wells have been drilled in Meruap Field. Previous studies on the reservoir were mainly focused on the understanding of depositional setting. Anomalous production in several wells motivated a new study focused on better understanding of the reservoir connectivity. Complete data sets from nine wells were utilized in this evaluation. Structural modelling was carried out based on high resolution data obtained from eight keys wells, i.e. borehole images and other open-hole and production data. A key stratigraphic facies was modeled based on the integration of borehole image logs and core descriptions. This key facies was then used to correlate stratigraphic units throughout Meruap Field. Structural dip was determined using borehole image data for each of these eight wells, followed by a near well-bore 3D model that was generated using structural dip data and the key facies model. The model result shows segregated divisions within Zone-1 reservoir due to faulting, explaining the anomalous production decline. The trend of fault displacement as observed in the model gives better direction for future development and production planning. Keywords: Borehole Image, Structural Modeling, Reservoir Evaluation, 3D Modeling, Production Decline.