KARAKTERISASI SESAR DALAM HUBUNGANYA DENGAN ALIRAN FLUIDARESERVOIR DI LAPANGAN MINAS AREA 1, CEKUNGAN SUMATRA TENGAH

• Main Author: Bosko Cahyo Indrarto, Yohanes
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/77505
• Institution: Institut Teknologi Bandung

Fault characterization, which is the major focus in this research, is fault character in terms of its ability to transmit fluid from the reservoir in one compartment to another compartment within the Minas oil field Area 1, Central Sumatra Basin. Detailed evaluation of the fault character in this area can significantly determine the appropriate field development strategy so that these areas are able to deliver optimum hydrocarbon production. Primary data used in this research covering well log curves, reservoir fluid pressure, pressure interference test, 3D seismic and velocity model. Secondary data serve as a reference in research both in the frame of regional geology, research area geology and technical studies of the analysis. The research method used is the method of induction by observation and analysis of data and then see how it relates to the research hypotheses. Fault analysis techniques using Shale Gouge Ratio calculation became the basis for this study. The results of this research identify a potential leak either at fault intersegment or on the fault plane itself. In general, reservoir juxtaposition on the fault plane gives high SGR value (> 35%) and low permeability (< 10 mD), but some areas on the fault plane also gives low SGR value (< 15%) and high permeability (> 50 mD). Segment 4 and 5 are the fault segments with high leaking potential due to low SGR value (< 15%) and high permeability value (> 50mD) on its fault plane. Validation and calibration using reservoir fluid pressure and pressure interference test proved that the fault zones is leaking with a threshold value of SGR between sealing and leaking at around 16%. Lithological composition which is represented by volume of shale and characteristics of the fault plane which are represented by fault geometry and vertical displacement (throw) are plays an important role in controlling fluid flow through a faulted reservoir from one compartment to another compartment. By recognizing the sealing capacity of this fault, applying pattern injection or selected infill wells strategy are more appropriate than applying miniperipheral injection strategy.