Abstract
East Natuna is well known for its humongous natural gas reserves with a high CO2 content. The high quantity of carbon dioxide requires implementation cutting-edge capture and storage process in its development plan which comes at a high cost. In order to increase the economic feasibility of the area, the impurities are proposed to be utilized CO2 as working fluid further to generate electricity through Enhanced Geothermal System (EGS). Carbon dioxide has been proven to be a better fluid for EGS as it could reach super critical state in much lower pressure and temperature compared to brine water. Sokang Trough Area in East Natuna Basin was selected as a candidate for pilot project due to its favorable geological condition.Carbon Capture Storage and Utilization (CCSU) especially EGS in sedimentary basin requires a suitable reservoir that fulfills several geological and engineering parameters. Firstly, it should porous enough to store fluid and permeable to flow it. The storage should also be deep enough to retain temperature above 87.98°F and pressure above 1071 psi in order to keep the CO2 in supercritical phase. Even further, EGS requires a minimum reservoir temperature of ±300°F to be technologically viable. In order to avoid vertical unintended migration, the reservoir should have high water saturation instead of gas saturation. Lastly, the seal should be able to confine the injected CO2 column within the storage.Formation evaluation workflow adapted for CCSU was employed in this study. Porosity, water saturation and permeability was estimated through deterministic approach. Formation pressure was calculated using Eaton’s equation. Reservoir temperature was estimated from available well testing data. Storage capacity was estimated for the whole structure with several cases. Considering all those parameters, several suitable reservoirs were able to be delineated in the CCS-1 well that is located within the East Natuna area.
Highlights
The demand for natural gas in Indonesia keeps increasing as the population grows
In the last few decades, one of the biggest discovery was made in East Natuna basin which is located in South China Sea (Figure 1)
A new scheme called Carbon Capture, Storage and Utilization (CCSU) was proposed in order to increases the economic feasibility of the operation that might enable the development of gas resource in East Natuna
Summary
The demand for natural gas in Indonesia keeps increasing as the population grows. In order to keep up with the needs, the oil and gas industry has to go back and re – evaluate untapped potential that has been sleeping for ages due to technical and economic reason. Within East Natuna Basin where the sleeping Giant Gas Field exist with problematics high CO2 content the last research within this area is conducting the investigation of storage efficiency for CO2 in water-saturated Carbonate Aquifers by having a laboratory experiment evaluation for the solubility of CO2 in water at various temperatures within several core plugs (Sugihardjo et al.,1999) This Paper is meant to elaborate the CSSU workflow that has been done to evaluate the presence of Sandstone unit aquifer in Arang Formation as one of the reservoir object for CO2 CCSU project the Sleeping Giant Gas field could be produced within safely environmental and economical condition. The property of shale unit above the gas reservoir is considered to be adequate as a seal as it could hold a reservoir with 87% CO2 gas content
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