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Risk assessment of fault reactivation considering the heterogeneity of friction strength in the BZ34-2 Oilfield,Huanghekou Sag,Bohai Bay Basin,China

引用

Petroleum Science 2023年第5期20卷 2695-2708页

作者： Ye-Jun Jin Ling-Dong Meng Ding-You Lyu Xiao-Fei Fu Jiang-Bo Huang Si-Jia Cao Jian-Da Li School of Earth Sciences Northeast Petroleum UniversityDaqing 163318HeilongjiangChina Key Laboratory of Oil&Gas Reservoir and Underground Gas Storage Integrity Evaluation of Heilongjiang Province Northeast Petroleum UniversityDaqing 163318HeilongjiangChina Bohai Rim Energy Research Institute Northeast Petroleum UniversityQinhuangdao066004HebeiChina CNOOC Tianjin Company Tianjin 300459China

The hazards of fault reactivation caused by fluid injection are a growing ***,traditional evaluation methods of fault stability are likely to underestimate the risk in fault segments with a high clay ***,an extended evaluation method of fault stability(ECPP)incorporating the heterogeneity in friction strength caused by variation in the clay content within the fault zone is established in this *** characterizing the current stress field of the BZ34-2 Oilfield in the Huanghekou Sag,Bohai Bay Basin,the reactivation potential of faults is evaluated using both traditional and ECPP *** evaluation of fault stability shows that all faults are stable in the present stress *** oriented ENE have a relatively high *** maximum sustainable fluid pressure Δp is approximately 8.8-8.9 MPa and 9.3-9.9 *** considering the heterogeneity in fault friction strength,the fault stability is clearly controlled by the clay content of the *** high-risk fault segments assessed using traditional methods are no longer obvious,which reflects the importance of incorporating friction strength heterogeneity in the process of fault ***,the results also show that most fault segments are activated when the fault zone is dominated by montmorillonite,reflecting the strong influence of clay mineral types on fault *** factors influencing the heterogeneity of fault friction strength are very complicated in actual ***,future work should focus on establishing a database through a large number of experiments and investigating the relationship between the friction coefficient and the main controlling factors.

关键词： faultreactivation In-situ stress Strength heterogeneity of fault friction Huanghekou Sag

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