The main objective of this final project is to conduct the economical feasibility analysis of one of the X Company's project that still in the exploration and appraisal stage. The project refers to the Shark field with one wellhead-platform (WHP) and one FPSO in Dolphin block. The project is analyzed by using capital budgeting decision method and sensitivity analysis. The capital budgeting decision method that is used as the theoretical foundation including Net Present Value (NPV) method, Internal Rate of Return (IRR) method, and Profitability Index Ratio (PIR). Meanwhile, Tornado and Spider chart are used as sensitivity analysis tools to know how some components can change the project's value.