ANALISIS SEKATAN SESAR PADA RESERVOIR FORMASI TALANG AKAR, LAPANGAN “TULIP”, CEKUNGAN SUMATERA SELATAN

• Main Author: Aufar Fadhli, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/69632
• Institution: Institut Teknologi Bandung

There are several hydrocarbon fields in Palembang High, one of which is the "Tulip" Field which is the research location. This area is approximately 70 km to the northwest of Palembang City. The stratigraphy of the Tulip Field are composed of pre-tertiary bedrock, the Lemat Formation, the Talang Akar Formation, the Baturaja Formation, the Gumai Formation (Telisa), and the Palembang Formation. The research focus is on the Reservoir of Talang Akar Formation. The purpose of this study was to study the geological setting of the “Tulip” Field in the South Sumatra Basin including physiography, stratigraphy, tectonostratigraphy, and geological structures as well as to analyze the nature of the fault seal using the Shale Gouge Ratio (SGR) method (Yielding et al., 1997). The fault-seal analysis was carried out by making a juxtaposition diagram, a vertical fault throw diagram, a clay volume (vclay) diagram and a Shale Gouge Ratio (SGR) diagram in the fault plane based on seismic data and well data in the study area. The data used in this study are 2D seismic data as many as 12 lines with a total length of about 121 km and wireline log data from 5 wells (Tulip-1, Tulip-2, Tulip-3, Tulip-4, and Tulip-5). The results of the analysis of several faults in the Tulip Field show that on the juxtaposed side of the Talang Akar Horizon (footwall) with the Baturaja Formation (hangingwall) and between the Talang Akar Horizons that juxtaposed each other, the value of the fault throw is in the range of 10-50 meters and the Shale Gouge Ratio value (SGR)>0.2. Based on Yielding (2002), this shows that normal faults in this juxtapose are sealing. The potential for faults to leak, based on Yielding (2002), found in sections with a Shale Gouge Ratio (SGR) <0.15. This potential was found in several parts of the fault in the Tulip Field. In this section it is interpreted that fluid leakage occurs, but this needs to be re-validated using pressure data or hydrocarbon contact. In the Tulip Field, the presence of a sealing fault structure causes reservoir compartmentalization. This can be considered for future exploration or development activities. The characteristic of fault seal in the Tulip Field has been being controlled by the lithology juxtaposition and the presence of clay material in the fault zone rather than by the throw of the fault.