Abstract
The carbonate reservoir is one of the reservoir characters found in hydrocarbon fields in Indonesia. Carbonate reservoirs have complex porosity and permeability relationships. So it is necessary to do a special reservoir character that is different from the siliciclastic reservoir. Efforts that can be made to assist the development of this hydrocarbon field are to analyze the reservoir character in more detail using the petrophysical rock type (PRT) approach. This approach is used by combining geological elements such as the depositional environment, the petrophysical properties of the rock, as well as the fluid flow in it which is reflected by capillary pressure and water saturation. Modeling with this method is expected to be a method that can increase hydrocarbon production optimally in Xena Field. The object of research from Xena Field is Zone A2 which is included in the Parigi Formation. The Parigi Formation is one of the main hydrocarbon-producing reservoirs. The data used in this study are routine core analysis (RCAL) rock data on JLB-07, JLB-08, JLB-02, JLB-23 wells, wire log data (gamma-ray log, resistivity log, density log, neutron log) of 30 wells, and 2D seismic data. The depositional facies are divided into 2 facies, namely the margin reef platform facies and the interior platform facies. Identification of rock type (RT) using the flow zone indicator (FZI) method. The rock type in this field can be divided into 4 rock types, namely RT 1, RT 2, RT 3, RT 4 with RT 1 being able to drain the best fluid and RT 4 to drain the worst fluid. Reservoir property modeling is controlled by facies and rock type (RT) models. The margin reef platform facies are associated with RT 1 and RT 2. The interior platform facies are associated with RT 2 and RT 3.
Highlights
Exploration activities require a basic study and research to determine areas that have hydrocarbon potential and increase oil and gas production in an area
Characterization of carbonate reservoirs with high heterogeneity is more complex than siliciclastic reservoirs because the pore system in the carbonate reservoir is the effect of depositional facies and complex diagenetic processes
The purpose of this study was to identify rock typing on carbonate reservoir rocks based on rock properties, to know the relationship between rock typing and depositional facies, to build a three-dimensional model, and to determine the distribution of reservoir properties A2 of the Parigi Formation in Xena Field
Summary
Exploration activities require a basic study and research to determine areas that have hydrocarbon potential and increase oil and gas production in an area. The purpose of this study was to identify rock typing on carbonate reservoir rocks based on rock properties, to know the relationship between rock typing and depositional facies, to build a three-dimensional model, and to determine the distribution of reservoir properties A2 of the Parigi Formation in Xena Field. The Hydraulic Flow Unit (HFU) method, porosity, and permeability properties from the Routine Core Analysis are used as parameters for the Reservoir Quality Index (RQI) and Flow Zone Indicator (FZI). The North-South trending fault divides the basin into grabens or several sub-basins, namely Jatibarang Sub-Basin (research area), Ciputat Sub-Basin, Kepuh Sub-Basin, Bungur Sand Sub-Basin [10] This sub-basin was filled with sediment and formed in the southern part of the Sunda shelf during the Tertiary age.
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