#TITLE_ALTERNATIVE#

• Main Author: ARTYANTO (NIM: 22014006), ANDIKA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25500
• Institution: Institut Teknologi Bandung

<p align="justify">Rantau Dedap Geothermal Field is located about 225 km southwest of Palembang City. Numerous complex fault and fracture structures formed in this field. The presence of these structures is the main factor related to geothermal system. However, not all the fault and fracture capable of flowing fluid. Critical stressed fracture analysis is the most leading method to determine which fracture could flowing fluid. To perform this analysis, the direction of stress must be known first along with maximum horizontal stress (SHmax) and other geomechanic parameters, include SHmax, SHmin, Sv, and fluid pressure. This critical stressed fracture analysis conducted in RD-I1, RD-C1, and RD-B1 well. The natural fracture and fractures caused by drilling execution was analyzed to those three wells. Based on natural fracture interpretation, RD-I1, RD-C1, and RD-B1 well have NE-SW, N-S, and NW-SE direction respectively. The fracture direction relatively parallel to Cawang, Besar, and Manna Faults. The interpretation of fractures caused by drilling execution have resulted breakout E-W direction, and induced tensile relatively showed N-S direction from three wells. RD-I1, RD-C1, and RD-B1 Wells indicate a inclination drilling well type. This caused SHmax value can’t directly determined from induced tensile fracture direction, but obtained from the calculation of SHmax orientation on each well instead. The calculation of SHmax in RD-I1 and RD-C1 Wells resulted N162oE - N204oE direction, while RD-B1 showed N241oE direction. That stress direction is consistent with N-S regional stress direction as Semangko Faults nowadays activity. The in situ stress determination conducted to knowing geothermal system structure trend in Rantau Dedap Geothermal Field. In situ stress is obtained from SHmin and SHmax value using stress polygon method. Stress polygon is a diagram consisting of stress value which needed to form breakout and induced tensile rocks. The use of breakout could predict SHmin and SHmax value on each depth. Based on in situ stress analysis, RD-I1, RD-C1, and RD-B1 wells have relatively SHmax > Sv > SHmin value and illustrate a strike slip fault regime. The critical stressed fracture analysis indicate RD-I1, RD-C1, and RD-B1 well are in critical condition based on maximum SHmax value. However, the result will be different by inserting rock strength parameters on each well. It indicates that the fracture on RD-I1, RD-C1, and RD-B1 well are permeabel fractures, with feed zone evidence. The fracture direction with critical condition on RD-I1, RD-C1, and RD-B1 well currently adhere with Besar, Cawang, and Manna Faults on NE-SW, N-S, and NW-SE direction respectively.<p align="justify">