Seismic reflectivity of hydraulic fractures approximated by thin fluid layers
MetadataShow full item record
We have analyzed the angle-dependent reflectivity of microseismic wavefields at a hydraulic fracture, which we modeled as an ideal thin fluid layer embedded in an elastic, isotropic solid rock. We derived full analytical solutions for the reflections of an incident P-wave, the P-P and P-S reflection coefficients, as well as for an incident S-wave, and the S-S and S-P reflection coefficients. The rather complex analytical solutions were then approximated and we found that these zero-thickness limit approximations are in good agreement with the linear slip model, representing a fracture at slip contact. We compared the analytical solutions for the P-P reflections with synthetic data that were derived using finitedifference modeling and found that the modeling confirmed our theoretical results. For typical parameters of microseismic monitoring by hydraulic fracturing, e.g., a layer thickness of h = 0.001-0.01 m and frequencies of f = 50-400 Hz, the reflection coefficients depend on the Poisson's ratio. Furthermore, the reflection coefficients of an incident S-wave are remarkably high. Theoretical results suggested that it is feasible to image hydraulic fractures using microseismic events as a source and to solve the inverse problem, that is, to interpret reflection coefficients extracted from microseismic data in terms of reservoir properties.
Showing items related by title, author, creator and subject.
Nabipour, Amin; Evans, Brian; Sarmadivaleh, Mohammad (2011)Hydraulic fracturing is known as one of the most common stimulation techniques performed on oil and gas wells for maximising hydrocarbon production. It is a complex procedure due to numerous influencing factors associated ...
Nabipour, Amin; Evans, Brian; Mϋller, T.; Sarmadivaleh, Mohammad (2011)Hydraulic fracture monitoring is a technique used for determining the geometry of the fracture underground. Active methods of fracture monitoring have shown potential in providing useful information which may not be easily ...
Uncertainty analysis of groundwater inflow into underground excavations by stochastic discontinuum method: Case study of Siah Bisheh pumped storage project, IranJavadi, M.; Sharifzadeh, Mostafa; Shahriar, K. (2014)This paper presents a framework for the near-field stochastic discontinuum modeling and uncertainty analysis of groundwater inflow into underground excavations by direct utilization of discrete fracture network (DFN) ...