1D GEOMECHANICAL MODELING AND CRITICALLY- STRESSED FRACTURE ANALYSIS BASED ON WELLBORE PROPERTIES DATA IN CARBONATE RESERVOIR INTERVAL PRE-TALANGAKAR FORMATION, EP FIELD, NORTH WEST JAVA BASIN

• Main Author: Ertanto, Alan
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/62410
• Institution: Institut Teknologi Bandung

Carbonate reservoir within Pre-Talangakar Formation in EP Field, North West Java Basin, is a fractured reservoir that is in development. Decreasing of oil and gas production rate in Indonesia demands an effort to increase production. The study of natural fracture characterization and geomechanics in EP Field aims to identify critically-stressed fractures in carbonate reservoir interval to optimize production by figure out the optimal drilling trajectory. Strike and dip are achieved by manual interpretation from image log. One-dimension geomechanical modelling was carried out from wireline log and well test result to generate in situ stress and stress regime by applying methods from Eaton, Hubbert and Willis, and Zoback. Critically-stressed fracture analysis is identified by Mohr diagram which constructed from geomechanical modelling, coefficient friction of rock, and set of natural fracture. Geomechanics analysis showed that study area under strike-slip stress regime with maximum horizontal stress in the direction of NNW to NNE. Natural fractures by interpretation of image log appear to be dominant striking NW-SE to NNW-SSE with dipping dominant 40 -45 degrees. Critically-stressed fractures in EP Field are dominant striking N128oE – N140oE or NW-SE and dip angle between 68 to 87 degrees. The optimal drilling trajectory is designed to intersect more critically-stressed fractures would be in direction of NE-SW with drilling inclination angle above 68 degrees.