CARBONATE RESERVOIR CHARACTERIZATION AND MODELING OF LOWER BATURAJA FORMATION, KRISNA FIELD, SUNDA BASIN
<p align="justify">Krisna Field, located at the western side within Sunda Basin, produce oil from Lower Baturaja Formation carbonate reservoir. Water injection and further development program require detail analysis through static and dynamic approach. This study is focused on the st...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/31755 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | <p align="justify">Krisna Field, located at the western side within Sunda Basin, produce oil from Lower Baturaja Formation carbonate reservoir. Water injection and further development program require detail analysis through static and dynamic approach. This study is focused on the static reservoir characterization using rock typing analysis. Hence, the main goal to obtain a comprehensive understanding of the petrophysical properties of the reservoir can be achieved by identification of the type, composition, and rock type (RT) distribution. <br />
Based on core and thin section analysis, and also seismic attribute, carbonate reservoir in Lower Baturaja Formation is an attached platform and isolated platform carbonate which has organic build-up, shelf lagoon open circulation, upper–middle foreslope, and lower foreslope–toe of slope facies association. <br />
RT are identified from 175 routine core samples using FZI method. Five rock types are associated with certain pore type and size: RT 1 (vuggy–interparticle micropore), RT 2 (vuggy–moldic micropore), RT 3 (vuggy–moldic meso–pacropore), RT 4 (vuggy–fracture meso–macropore), and RT 5 (vuggy and fracture–channel). <br />
The development of reservoir quality, which associated with rock type, are controled by facies association and diagenetic processes. It could be seen that secondary porosity commonly appear. But it depends on the type of components that dissolves. Coral fragments containing calcite material from organic build-up facies will be easier to dissolve compared to lime mud (micrite) from shelf lagoon facies. <br />
3D reservoir characterization is performed using rock type, porosity, and permeability modeling. The modeling has been done using geostatistical approach. This study shows consistency between petrophysical properties and the underlying rock type models. The result of this study can be used as the main input of dynamic simulation for water injection and further development plan.<p align="justify"> |
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