KARAKTERISASI RESERVOIR DAN PERHITUNGAN VOLUMETRIK HIDROKARBON BERDASAR ANALISIS PETROFISIKA DAN PEMODELAN GEOSTATISTIKA PROPERTI RESERVOIR DI LAPANGAN ORION, CEKUNGAN SUMATRA SELATAN; RESERVOIR CHARACTERIZATION AND HYDROCARBON VOLUMETRIC CALCULATION BASED ON PETROPHYSICAL ANALYSIS AND GEOSTATISTICAL RESERVOIR PROPERTY MODELING IN ORION FIELD, SOUTH SUMATRA BASIN

Nugroho, Dwi Prasetyo A, N

2015 | Skripsi | FMIPA

stock tank original oil in place (STOOIP) calculations based on petrophysical analysis results , facies modeling, and reservoir property characterization have been done in Orion field, Talang Akar formation, South Sumatra Basin. Based on facies modeling results, it is known reservoir zones are composed by deposition of channel sand, delta front sand, shaly sand and shale in fluvial – deltaic – shallow marine depositional system. Petrophysical analysis of 14 wells was conducted to determine rock’s physical properties (such as shale volume, effective porosity and water saturation). Shale volume was calculated by using Spontaneous Potential log baseline. Effective porosity was calculated by comparing three methods (RhoB - NPhi, derivative regression of shale volume, and artificial neural network). Meanwhile, water saturation was calculated by using Indonesia equation. Reservoir properties modeling was done by using conditional sequential Gaussian simulation which is controlled by acoustic impedance distribution map and variogram model of reservoir properties in each layers. The result of property modeling distribution in 3D framework was used to calculate hydrocarbon reserve in Orion field.

Kata Kunci : petrophysical property characterization; reservoir modeling; conditional sequential simulation; STOOIP