ONE-DIMENSIONAL GEOMECHANICAL MODELLING AND ITS IMPLICATION ON FAULT STABILITY IN CARPIO FIELD, SALAWATI AREA, WEST PAPUA

• Main Author: Ruzieqna, Fiha
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/37298
• Institution: Institut Teknologi Bandung

Fault stability analysis was carried out in Carpio Field, Salawati Area, West Papua Province. This analysis was conducted to determine the tendency of faults to experience reactivation which can be a risk in oil and gas exploration and production. In conducting this research, an analysis of in-situ stress regime was carried out through one-dimensional geomechanical modeling. The study was conducted using well log data, pressure test results, drilling reports and 3D seismic cube. Geomechanical modeling is done by using well log data through the application of Zoback-Healy (1984) and Haimson-Fairhurst (1970) methods, which are then calibrated with the results of a LOT (Leak-Off Test) pressure test. The modeling results can then be applied in fault stability analysis that includes Slip Tendency (Ts), Dilation Tendency (Td) and Fracture Stability (Fs). The result of geomechanical modeling shows that the in-situ stress in Carpio Field is currently dominated by normal fault regime. Image log data shows that the maximum horizontal stress has northnortheast – south-southwest direction that corresponds to the direction of the extensional fracture as part of wrenching association of Sorong Fault. Analysis of fault stability shows that the faults in Carpio Field which was dominated by the north-northeast – south southwest direction is more likely to experience dilation than experiencing a slip. In addition, a small additional pore pressure value is needed (0,39 psi/ft) so that the faults could be reactivated.