The gas is an energy transition that can reduce carbon emissions cause its climate change. Implementation of energy transition by plan of gas field development (POFD). The Natuna D Alpha Field with 71% of CO2 content and 28% of CH4 content. It is necessary to study upgrading natural gas specification in accordance with the sales gas specifications. Natuna D Alpha development study using Techno-Economics method. For technical aspect, we design polymer membrane technology with Polysulfone into Python then input to unisim. Membrane technology is to separate CO2 from natural gas. Furthermore, CO2 captured will re inject to subsurface as the implementation of carbon capture storage & utilization through estimating CO2 storage capacity for sequestration and enhanced gas recovery . Meanwhile, the economic aspect is to determine project feasibility using a production sharing contract cost recovery scheme, whose are the Government and the Contractor. The result is 95,02% of CH4 content with 4,89% of CO2 content. It needs investment cost of 5.451.869 MUSD. Based on the economic aspect Natuna D Alpha gas field development can proceed to the execution stage that determined net present value (NPV) of USD 24,960 million then IRR is about 13,84%, Payback Period (PBP) in 7,05 year.
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