--> --> Reservoir Description Using Hydraulic Flow Unit and Petrophysical Rock Type of PMT Carbonate Early Miocene of Baturaja Formation, South Sumatra Basin

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Reservoir Description Using Hydraulic Flow Unit and Petrophysical Rock Type of PMT Carbonate Early Miocene of Baturaja Formation, South Sumatra Basin

Abstract

Carbonate reservoir commonly have a wide range of porosity and permeability. Porosity and permeability relationship commonly derived from wireline log base and core-calibrated. Both of Hydraulic Flow Unit (HFU) and Petrophysical Rock Type (PRT) analysis predominantly using porosity and permeability core data. The Hydraulic Flow Unit (HFU) identification was carried out by classify the reservoir base on their cumulative flowing capacity using Modified Lorenz Plot (MLP) methods, while Petrophysical Rock Type (PRT) identification based on Flow Zone Indicator (FZI) and Windland R35 plot. The analysis result shows there are six Hydraulic Flow Unit (HFU). HFU 1, HFU 2, HFU 3, and HFU 5 have a good flowing capacity while HFU 4 and HFU 6 are baffles. Petrophysical analysis result mainly shows three group of Petrophysical Rock Type (PRT) base on pore types and pore sizes associated. PRT 1 microfacies is large foram bioclastic wackestone, PRT 2 is large foram bioclastic wackestone and benthic bioclastic wackestone/packestone association, PRT 3 is benthic bioclastic wackestone/packstone. Based on DST result, shows the HFU unit 1,2,3 and 5, also PRT 1 which is Large Foram Bioclastic Wackestone has the most productive reservoir among the others. The data shows that petrophysical rock type is inline with capillary pressure profile and thus will giving different water saturation at high above free water level (HAFWL) and will affect the hydrocarbon pore volume (HCPV).