Geomechanical Analysis to Determine The Maximum Limit of Water Injection in the Keutapangan Formation, “ZA” Field, North Sumatra Basin
DOI:
https://doi.org/10.17794/rgn.2026.2.1Keywords:
1D MEM, pore pressure, rock strengths, rock elastic properties, minimum horizontal stressAbstract
The "ZA" Field is located in the North Sumatra Basin and is predominantly affected by geopressure issues. As such, geomechanical analysis is crucial during drilling operations to mitigate potential hazards. The geomechanical analysis conducted in this study utilizes a 1D Mechanical Earth Model (MEM), which includes the following components: overburden stress, pore pressure, rock strength, rock elastic properties, and minimum horizontal stress. The data used in this analysis were obtained from the following sources: wireline logging for all geomechanical calculations, pressure tests to validate pore pressure values, fracture gradient data to validate the minimum horizontal stress curve, step-rate tests to determine the injection pressure limit, and well reports. The "ZA" Field exhibits a complex geopressure regime, ranging from underpressure to overpressure, with transitional zones that combine both conditions. Overpressure is primarily attributed to loading mechanisms, while underpressure results from historical fluid extraction during previous drilling activities. Lithological analysis indicates that the reservoir consists of shaly sand and fine-grained formations. Due to the shallow burial depth, these rocks remain poorly consolidated, resulting in a narrow safe injection window above the pore pressure. This constraint is exemplified by one well, where the maximum allowable injection pressure was 7.63 MPa, with only a 2 MPa margin above the pore pressure.
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Copyright (c) 2026 Zahra Adinda Billqish, Andika Wicaksono, Sismanto Sismanto
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