Fracture prediction approach for oil-bearing reservoirs based on AVAZ attributes in an orthorhombic medium
投稿时间:2017-10-16  
英文关键词:Fracture, AVAZ, Orthorhombic media, Oil-bearing reservoir
基金项目:This study was financially supported by 973 Program (No. 2014CB239104), NSFC and Sinopec Joint Key Project (U1663207) and National Key Science and Technology Project (2017ZX05049002).
作者单位
Yu-Wei Liu National Key Laboratory of Corporation of Shale Oil/Gas Enrichment Mechanism and Effective Development, Beijing 100083, China
Sinopec Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 100083, China
Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China 
Xi-Wu Liu National Key Laboratory of Corporation of Shale Oil/Gas Enrichment Mechanism and Effective Development, Beijing 100083, China
Sinopec Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 100083, China
Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China 
Yong-Xu Lu China University of Mining & Technology (Beijing), Beijing 100083, China 
Ye-Quan Chen National Key Laboratory of Corporation of Shale Oil/Gas Enrichment Mechanism and Effective Development, Beijing 100083, China
Sinopec Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 100083, China
Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China 
Zhi-Yuan Liu National Key Laboratory of Corporation of Shale Oil/Gas Enrichment Mechanism and Effective Development, Beijing 100083, China
Sinopec Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 100083, China
Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China 
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英文摘要:
      Fracture systems in nature are complicated. Normally vertical fractures develop in an isotropic background. However, the presence of horizontal fine layering or horizontal fractures in reservoirs makes the vertical fractures develop in a VTI (a transversely isotropic media with a vertical symmetry axis) background. In this case, reservoirs can be described better by using an orthorhombic medium instead of a traditional HTI (a transversely isotropic media with a horizontal symmetry axis) medium. In this paper, we focus on the fracture prediction study within an orthorhombic medium for oil-bearing reservoirs. Firstly, we simplify the reflection coefficient approximation in an orthorhombic medium. Secondly, the impact of horizontal fracturing on the reflection coefficient approximation is analyzed theoretically. Then based on that approximation, we compare and analyze the relative impact of vertical fracturing, horizontal fracturing and fluid indicative factor on traditional ellipse fitting results and the scaled B attributes. We find that scaled B attributes are more sensitive to vertical fractures, so scaled B attributes are proposed to predict vertical fractures. Finally, a test is developed to predict the fracture development intensity of an oil-bearing reservoir. The fracture development observed in cores is used to validate the study method. The findings of both theoretical analyses and practical application reveal that compared with traditional methods, this new approach has improved the prediction of fracture development intensity in oil-bearing reservoirs.
Yu-Wei Liu,Xi-Wu Liu,Yong-Xu Lu,Ye-Quan Chen,Zhi-Yuan Liu,2018.Fracture prediction approach for oil-bearing reservoirs based on AVAZ attributes in an orthorhombic medium.Petroleum Science,(3):510~520.
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