Document Type : Original Article
Authors
1
Department of Earth Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
2
Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran
3
Department of Petroleum Engineering, Omidiyeh Branch,Islamic Azad University,Omidiyeh, Iran
4
1Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran
5
PhD in Structural Geology Department of Earth Sciences , Science and Research branch, Islamic Azad University, Tehran, Iran.
10.22077/jt.2025.8564.1196
Abstract
From a geomechanical perspective, production from a reservoir and its gradual discharge cause changes in the stress field governing the reservoir. In this study, the possibility of creating cracks and faults in reservoirs under discharge has investigated using geomechanical modeling. Awareness of the status and slip of faults during the life of the reservoir is of great importance. If a new crack or fault has been created in the reservoir, it will incur high costs and risks in the drilling operation. Using well logging data from one of the reservoirs in southwestern Iran, the main stresses in the reservoir were calculated, a geomechanical model of the reservoir was created, and a safe drilling mud window was calculated for it. Finally, the potential for the creation of cracks and faults during the production period from the reservoir was investigated. The results show that the leakage pressure in the studied reservoir is equal to the minimum horizontal stress value (σ3), whose approximate average is 41.75 MPa. The stress regime in the reservoir is normal faulting, and the best safe drilling direction in this reservoir is parallel to the vertical stress. According to the results, the horizontal in-situ stress direction is at least equal to N16W-S16E and the horizontal in-situ stress direction is at most equal to N74E-S74W with a standard deviation of 6.5 degrees. The probability of creating a new fault due to reservoir discharge in the sandstone layers of the studied reservoir is higher than in the limestone and dolomite layers.
Keywords
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