Richard Bale | University of Cambridge (original) (raw)

Papers by Richard Bale

SEG Technical Program Expanded Abstracts 2000, 2000

60th EAGE Conference and Exhibition, 1998

There are now several convincing examples of improved imaging using shear-wave data from 2-D mult... more There are now several convincing examples of improved imaging using shear-wave data from 2-D multi-component surveys (e.g. Thomsen et al., 1996). The evolution from 2-D to 3-D acquisition and processing for converted wave data is rapidly occurring, due to the well known advantages of 3-D seismic images.

Summary We demonstrate an adaptation of the COV concept to converted-wave (PS) data, and discuss ... more Summary We demonstrate an adaptation of the COV concept to converted-wave (PS) data, and discuss applications of the COV domain in PS processing. We illustrate that one possible application is to update the Vp/Vs used for CCP binning, based upon analysis of reciprocal COVs, with equal but opposite offset vector directions.

Summary We demonstrate several aspects of processing 3-C data to obtain anisotropy information fr... more Summary We demonstrate several aspects of processing 3-C data to obtain anisotropy information from shearwave splitting. This includes: analysis for unknown or uncertain field orientations of the receivers; a new method of splitting analysis which uses both radial and transverse component data to estimate the S1 direction, which is compared with a transverse only method; and some analysis of the difference between P-S1 and P-S2 imaging versus anisotropy-corrected “radial-prime” (R’) imaging.

$Research paper thumbnail of Shear wave splitting applications for fracture analysis and improved imaging: some onshore examples$

First Break, 2009

Richard Bale, Bruno Gratacos, Bruce Mattocks, Steve Roche, Kostya Poplavskii and Xinxiang Li1 exp... more Richard Bale, Bruno Gratacos, Bruce Mattocks, Steve Roche, Kostya Poplavskii and Xinxiang Li1 explain the value of shear wave splitting for reservoir characterization when using multi-component land seismic data. They illustrate the technique with data examples from the US and Canada.

62nd EAGE Conference & Exhibition, 2000

Making use of elastic wavefield extrapolators to downward continue shots and receivers through la... more Making use of elastic wavefield extrapolators to downward continue shots and receivers through layered isotropic or HTI media, we have developed a prestack shotrecord elastic migration algorithm. The imaging conditions used are briefly explained, and the migration operators illustrated by impulse responses. Application of the algorithm to modelled isotropic data demonstrates the imaging of a density anomaly in an otherwise laterally invariant medium. The resolution of the P-SV image is superior to that of the P-P, as anticipated. Moreover, the illumination characteristics of the P-SV shot migrations differ in a complementary way to those of the P-P migrations. In future we anticipate extending the algorithm to laterally heterogeneous isotropic and HTI media.

SEG Technical Program Expanded Abstracts 1999, 1999

SEG Technical Program Expanded Abstracts 2004, 2004

57th EAEG Meeting, 1995

Irregular acquisition geometry is inevitable due to obstacles and cable feathering in 3-D marine ... more Irregular acquisition geometry is inevitable due to obstacles and cable feathering in 3-D marine surveys and access limitations in 3-D land surveys. The irregularities will damage the fidelity of seismic images, unless they are properly handled in the processing. DMO in particular, must take account of the actual geometry. Black, Schleicher, and Zhang (1993) have developed an anaiytical calibration method that is implemented via the DMO amplitude term. In this paper we extend the DMO calibration to take into account the irregular geometry, and develop a geometrical calibration.

SEG Technical Program Expanded Abstracts 1996, 1996