TTI/HTI Anisotropy for Fracture/Faults Image Inside Granite Basement

Zhou, Jun; Ngoc, Nguyen Huy; Borthwick, Tom; Zhao, Kai; Teng, Keat Huat

doi:10.3997/2214-4609.20149056

Cited by 4 publications

(2 citation statements)

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“…However, seismic anisotropy in fractured sedimentary rocks could be more complicated than VTI structure or homogeneous layering due to the superposition of intrinsic foliation, horizontal bedding, and aligned cracks. Anisotropy not only affects ray paths and travel times of seismic waves but also influences seismic amplitude and polarization [8] [9]. Therefore, in this study we quantify the biases in microseismic event locations using synthetic waveform data from different configurations of anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Quantification of the Impact of Seismic Anisotropy in Microseismic Location

Jing¹,

Zhou²,

Li³

2016

IJG

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Seismic anisotropy in sedimentary rocks, due to either layered bedding or fracturing, may bias microseismic locations if unaccounted in velocity models. To quantitatively assess such biases, we have applied a nonlinear location method to synthetic travel time data in seven models from isotropy to different levels of VTI (Vertical Transverse Isotropy) and HTI (Horizontal Transverse Isotropy) cases. Synthetic waveforms are recorded at two vertical receiver arrays in a three-layer velocity model using a pseudo-spectral method. Both P and S wave arrivals are used to locate three events assuming an effective isotropic velocity model. The average location error is 59 m for isotropic case, about the size of the grid interval in the velocity model, and is 156 m (158 m), 237 m (244 m), and 258 m (265 m) for 5%, 10% and 15% VTI (HTI) cases, respectively. These results suggest that even 5% seismic anisotropy, if not properly accounted, can cause significant biases in microseismic event locations.

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Section: Introductionmentioning

confidence: 99%

Quantification of the Impact of Seismic Anisotropy in Microseismic Location

Jing¹,

Zhou²,

Li³

2016

IJG

View full text Add to dashboard Cite

show abstract

“…However, the actual earth model is much more complex than a lateral invariant isotropic-homogeneous medium. Numerous 3D surface seismic surveys have shown that HTI anisotropy has an effect on the seismic velocities and amplitudes due to the presence of unequal horizontal stresses and/or vertical aligned fractures (e.g., Abdullatif and Watkins, 2000, Zheng and Dragana, 2004, Zhou et al, 2011. Measurements of the shear wave splitting (SWS) and source mechanisms using microseismic data on non-vertical propagating shear waves also proved the impact of HTI media on microseismic SWS, and were used as approaches to invert aligned vertical fractures (e.g., Verdon et al 2009, Wüestefeld et al, 2010, Rutledge and Phillips, 2003.…”

Section: Introductionmentioning

confidence: 99%