A New Approach To Evaluate Fault-Sliding Potential With Reservoir Depletion
- Kai Zhao (Xi’an Shiyou University and Shanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs) | Xiaorong Li (University of Texas at Austin) | Chuanliang Yan (China University of Petroleum, East China) | Yongcun Feng (The University of Texas at Austin) | Liangbin Dou (Xi’an Shiyou University) | Jing Li (China University of Petroleum, East China)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- October 2019
- Document Type
- Journal Paper
- 2,320 - 2,334
- 2019.Society of Petroleum Engineers
- reservoir depletion, fault sliding potential, fault reactivation
- 3 in the last 30 days
- 191 since 2007
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Fault reactivation caused by reservoir depletion has been an important issue faced by the oil and gas industry. Traditional views suggest that with reservoir depletion, only normal faults can be activated and fault stability either monotonically decreases or increases, which are not consistent with field observations. In this paper, a fault-sliding-potential (FSP) model was developed to analyze fault stability during reservoir depletion for different types of faults. The evolution trend of fault stability with reservoir depletion and the corresponding judging criteria were obtained by calculating the derivatives of FSP. The influences of reservoir depletion on nonsealing and sealing faults were investigated. Case studies were performed to analyze FSP for different types of nonsealing and sealing faults with different fault properties and attitudes. The results show that reverse and strike faults might also be reactivated with reservoir depletion. The fault stability might not monotonically decrease or increase; instead, four evolution patterns of fault stability might occur, with reservoir depletion dependent on the parameters of the faults. Reservoir depletion usually leads to a higher sliding risk for sealing faults than for nonsealing faults. The results also indicate that fault stability is a strong function of fault attitudes, including the dip and strike of the fault.
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