Publications

The Kerisi oil field is located in the South Natuna Sea Block B PSC. The Kerisi-1A exploratory well was spudded in 1990 and discovered oil and gas in the formations Upper Gabus and Lower Gabus reservoirs. It was not until late 2007 when the Kerisi field was put on production. In total eight producers, which included three horizontal wells and one injector, were optimally placed by utilizing seismic attributes and log while drilling (LWD). The Lambda-Rho seismic volume derived from the summation of weighted angle stack reflectivity data successfully guided the entire well placement. The drilling results highlighted the usage of Lambda-Rho as a good indicator for determining the rock quality and its distribution (Kahar et.al. 2008). The latest seismic work that was done after the first development drilling campaign in 2008 resulted in the placement of 9 wells. The last two development wells drilled in 2011 also were a success and are used in this work. The Lambda-Rho seismic volume and the well logs describing the reservoir properties, show a good correlation. Therefore seismic Lambda-Rho can be used for predicting the reservoir distribution of the Upper Gabus Massive. However, since the Lambda-Rho depth volume has not been tied to the last two development wells, the work presented here also discusses the update of the depth volume. This paper will demonstrate the benefit of using volume based seismic Lambda-Rho data as input for improving the Upper Gabus Massive static model. In addition the difference between a map based and a volume based approach is shown, which can lead to a better identification of geologic features and minimizes the uncertainty in predicting sand presence. Thus, this workflow will provide a better understanding of the reservoir for future development potential.