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• W1878476691 abstract "The presence of fractures in hydrocarbon reservoirs can enhance porosity and permeability, and consequently increase production. The use of seismic anisotropy to characterize fracture systems has gained much interest in the last two decades. However, estimating fracture sizes from observations of seismic anisotropy has not been possible. Recent work has shown that frequency-dependent anisotropy (FDA) is very sensitive to the length-scale of the causative mechanism for the anisotropy. In this study, we observe FDA in a microseismic data set acquired from a carbonate gas field in Oman. The frequency-dependent shear wave anisotropy observations are modelled using a poroelastic model, which considers fluid communication between grain size pore spaces and larger scale fractures. A grid search is performed over fracture parameters (radius, density and strike) to find the model that best fits the real data. The results show that fracture size varies from the microscale within the shale cap rocks, to the metre-scale within the gas reservoir, to the centimetre-scale within the non-producing part of the carbonate formation. The lateral variation in fracture density agrees with previous conclusions from ordinary shear wave splitting (SWS) analysis. Cumulatively, the results show the potential for characterizing fracture systems using observations of FDA." @default.
• W1878476691 created "2016-06-24" @default.
• W1878476691 creator A5075700207 @default.
• W1878476691 creator A5084292871 @default.
• W1878476691 creator A5086300371 @default.
• W1878476691 date "2011-03-28" @default.
• W1878476691 modified "2023-09-24" @default.
• W1878476691 title "Fracture characterization using frequency-dependent shear wave anisotropy analysis of microseismic data" @default.
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• W1878476691 doi "https://doi.org/10.1111/j.1365-246x.2011.04997.x" @default.
• W1878476691 hasPublicationYear "2011" @default.
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