Measuring shear-wave splitting using seismic anisotropy

B. M. Yousef*, D. A. Angus, M. W. Hildyard, J. P. Verdon, M. Perry

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

In this study, we investigate the feasibility of using microseismic data to invert for fracture density, fracture strike and fracture compliance ratio from shear splitting results. We simulate microseismic waveforms by propagating a moment tensor point source disturbance in a heterogeneous isotropic media using a finite difference program. The model heterogeneity is imposed by the inclusion of discrete fractures within an isotropic homogeneous background model. Shear-wave splitting due to wave propagation through the discrete fracture network is evaluated using an automated shear-wave splitting algorithm. The calculated fast directions and delay times are subsequently inverted using an effective media fracture model to invert for fracture parameters. For the particular geometry in this study, the results from the inversion are best for sub-horizontal ray paths, where wave propagation travels predominantly through the vertically fractured sub-volume. For larger fractures, the inversion under estimates the fracture density and larger error in fracture strike direction. The results indicate that acquisition geometry is an important factor in resolving fracture parameters.

Original languageEnglish
Title of host publication76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014
PublisherEAGE Publishing BV
Pages4992-4996
Number of pages5
ISBN (Print)9781632666949
Publication statusPublished - 2014
Event76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014 - Amsterdam, Netherlands
Duration: 16 Jun 201419 Jun 2014

Conference

Conference76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014
CountryNetherlands
CityAmsterdam
Period16/06/1419/06/14

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