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1. (WO2013122659) SHEAR WAVE SOURCE FOR VSP AND SURFACE SEISMIC EXPLORATION

Pub. No.:    WO/2013/122659    International Application No.:    PCT/US2012/067176
Publication Date: Fri Aug 23 01:59:59 CEST 2013 International Filing Date: Sat Dec 01 00:59:59 CET 2012
IPC: G01V 1/00
Applicants: HALLIBURTON ENERGY SERVICES, INC.
WILLIS, Mark, E.
Inventors: WILLIS, Mark, E.
Title: SHEAR WAVE SOURCE FOR VSP AND SURFACE SEISMIC EXPLORATION
Abstract:
Seismic shear-wave survey systems and methods that employ inclined borehole pairs with directional detonations. If the boreholes have substantially equal inclinations in opposite azimuthal directions, the resulting signal traces can be combined to isolate shear wave energy contributions, thereby offering potentially enhanced resolution and reduced-complexity interpretation. The boreholes may be cased to ensure repeatability for, e.g., monitoring of reservoir fracturing, treatments, and/or drainage. The directional charges may be immersed to improve coupling of seismic energy into the formation.