Volumetric calculations for estimating reserves of oil and gas energy resources

The energy requirement in Indonesia is relatively high. Areas with oil reserves in Indonesia are still available because the existing refineries only produce 60% to 70% of their total production capacity potential. Therefore, it is necessary to estimate potential reserves of existing oil and gas resources, both in exploration areas and in existing oil and gas fields. The oil and gas field evaluation aims to develop oil and gas fields and increase oil and gas production. One of the methods used is the volumetric calculation to estimate oil and gas reserves. This method is used when the available data is incomplete. This method can be used to determine the initial hydrocarbon in place. This method is carried out in the prospect area of the “R” field, South Sumatra, Indonesia. Using porosity, saturation, and formation volume factor from petrophysical data, and bulk volume calculated using the trapezoidal and pyramidal formula from the depth structure map data, initial hydrocarbons in place in prospect area can be estimated at 10.3 MMSTB for oil and 8.55 BSCF for gas. By estimating reserves, we can estimate the potential value of oil and gas resources to fulfill energy needs.