Publications

East Natuna is an oil and gas area that is located in South China Sea, and was discovered in 1973. The humongous discovery that containes a lot of impurity makes it one of the biggest yet problematic gas resource in South East Asia. Due to the high CO2 content, those herculean gas reserves has not been developed. In light of that, Carbon Capture and Storage technology has become a viable option for handling gas impurities in East Natuna. The economic feasibility of the project is heavily dependent on the storage capacity. However, a typical CCS project has minimum amount of data to work with in the initial planning stages. This paper discusses the workflow that could be used to identify and model aquifer candidate for the CO2 storage using minimum available data. The dataset from SS Structure in East Natuna, which comprised of one exploration well and tightly knitted 2D seismic lines, is similar to typical available data in CCS project. Formation evaluation has delineated DS-1 interval as the storage and its overlying shale as the caprock candidate at the depth of 3625.28 � 3784.92 ft. The storage is a water saturated shoreface and tidal inlet sandstone deposit with 50% clay volume and 19% effective porosity. The caprock is water saturated offshore mud deposit with 63% clay volume and 2% effective porosity. Reservoir pressure of 1630 psi and temperature of 108�F are able to sustain the CO2 in super critical state. Storage capacity was estimated to be 674 BSCF or 35.7 MMtonnes. In perspective, Indonesia could become carbon neutral country by storing its CO2 emission to 15 reservoirs similar to DS-1 interval. Then, storing 170 TCF of CO2 originated from East Natuna would require 255 of reservoirs resembling DS-1 interval.