ABSTRACT: Belanak Field Development - New reserves from new technology
Matthew, James, Hendro Adrian, Bernie Clinton, James Ekstrand, Ali Mudhofar, and Gary Myers , Conoco Inc, Houston, TX
The Belanak field in Block B, West Natuna Sea, was discovered in 1975 by the Belanak-1 well. After three appraisal wells the field laid dormant until a gas market to Singapore was identified. Since then 3D seismic data was acquired, two recent appraisal wells were drilled downdip of the main structural high, and a modern reservoir characterization exercise has been undertaken. These efforts have significantly increased reserves by as much as 3-fold for oil and condensate and 2-fold for gas, making this one of the largest fields in the West Natuna Sea. Seismic attributes have been use to define gas bearing sands in the Arang, and zones of higher porosity in the deep Lower Gabus reservoirs. Seismic continuity has helped identify small-scale faults. Petrophysical application of Fuzzy-Logic and multi-linear regression has been applied to identify rock flow units and quantify permeability from logs. Special Core Analysis has improved the quantification of saturation. Detailed geologic reservoir models and flow modeling have been used to model the effects of gas coning and gas breakthrough in these heterogeneous reservoirs, and compositional models have been used to optimize the recovery of condensate and liquids from the gas. The results of these efforts will be presented to show how they have impacted the predicted reserves.
AAPG Search and Discovery Article #90913©2000 AAPG International Conference and Exhibition, Bali, Indonesia