RESERVOIR CHARACTERIZATION OF CARBONATE RESERVOIRS OF BATURAJA FORMATION, KITTY FIELD, SUNDA BASIN

• Main Author: KUSUMA WIJAYA, ADITYA
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/14651
• Institution: Institut Teknologi Bandung

Kitty Field is located in the southern part of Sunda Basin that produce oil from <br /> <br /> <br /> <br /> <br /> carbonate Baturaja Formation. Re-development plans and water injection program <br /> <br /> <br /> <br /> <br /> of this field, as the consequence, require detail analysis through static and <br /> <br /> <br /> <br /> <br /> dynamic approaches. This thesis focuses on the static reservoir characterization <br /> <br /> <br /> <br /> <br /> through the identification of rock type. Hence, the main goal to obtain a <br /> <br /> <br /> <br /> <br /> comprehensive understanding of the petrophysical properties of the reservoir can <br /> <br /> <br /> <br /> <br /> be achieved by identification the type, composition and rock type (RT) <br /> <br /> <br /> <br /> <br /> distribution. <br /> <br /> <br /> <br /> <br /> Based on analyses and interpretation of core and petrographic data and also <br /> <br /> <br /> <br /> <br /> seismic attribute data, carbonate of Baturaja Formation, Kitty Field is an isolated <br /> <br /> <br /> <br /> <br /> platform carbonate which divided into two depositional cycle, which are platform <br /> <br /> <br /> <br /> <br /> margin reef complex, platform interior, and shallow marine shale-basin fasies <br /> <br /> <br /> <br /> <br /> association in first cycle represented Lower Baturaja Formation and skeletal <br /> <br /> <br /> <br /> <br /> mounded fasies association in the second cycle represented Upper Baturaja <br /> <br /> <br /> <br /> <br /> Formation. <br /> <br /> <br /> <br /> <br /> RT identification is performed by FZI plot technique with the 118 routine core <br /> <br /> <br /> <br /> <br /> data. From the plot, five rock types appear, each having a very distinct <br /> <br /> <br /> <br /> <br /> porosity/permeability relationship with a high correlation coefficient. The second <br /> <br /> <br /> <br /> <br /> stage is petrographic analysis from 35 thin section samples which spread in all <br /> <br /> <br /> <br /> <br /> RT. From this analysis, RT identification is done by observation of pore types, <br /> <br /> <br /> <br /> <br /> pore sizes and pore associations based on Lucia, 1983 and Lonoy, 2006. The five <br /> <br /> <br /> <br /> <br /> RT which were identified are (1) RT 1–separate vug, (2) RT 2– separate vug <br /> <br /> <br /> <br /> <br /> intercrystalline, and interparticle micropore, (3) RT 3–separate vug (moldic <br /> <br /> <br /> <br /> <br /> micropore) and interparticle micropore, (4) RT–touching vug and interparticle <br /> <br /> <br /> <br /> <br /> macropore, dan (5) RT 5–touching vug and (fracture and channel) <br /> <br /> <br /> <br /> <br /> The formation of reservoir quality or RT from the interval study was controlled by <br /> <br /> <br /> <br /> <br /> diagenetic processes. It could be seen that generally the secondary porosity <br /> <br /> <br /> <br /> <br /> appears. The study shows that the RT is not correlated to facies. One RT appears <br /> <br /> <br /> <br /> <br /> in several facies. So the diagenetic processes becomes important in reservoir <br /> <br /> <br /> <br /> <br /> quality or rock type development. Three-dimensional reservoir characterization is performed for RT, porosity and <br /> <br /> <br /> <br /> <br /> permeability models. The modelling has been done by geostatistical approach. <br /> <br /> <br /> <br /> <br /> The study shows strong consistency between petrophysical properties and the <br /> <br /> <br /> <br /> <br /> underlying rock type models. The study results will be used as main input of <br /> <br /> <br /> <br /> <br /> dynamic simulation for water injection and further development plan in carbonate <br /> <br /> <br /> <br /> <br /> reservoir, Baturaja Formation, Kitty Field.