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TitleOptimum source-receiver orientations to capture PP, PS, SP, and SS reflected wave modes
AuthorPugin, A; Yilmaz, Ö
SourceThe Leading Edge vol. 38, issue 1, 2019 p. 45-52, https://doi.org/10.4095/313528 (Open Access)
Year2019
Alt SeriesNatural Resources Canada, Contribution Series 20180363
PublisherSociety of Exploration Geophysicists
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
Subjectsgeophysics; fossil fuels; geophysical surveys; seismic surveys, ground; seismic waves; in-field instrumentation; petroleum resources; petroleum exploration; exploration guidelines; Microvibe; landstreamer receiver array; reflection amplitudes; source-receiver orientation
Illustrationsschematic representations; profiles; seismic profiles; spectra
ProgramAquifer Assessment & support to mapping, Groundwater Geoscience
Released2019 01 01
AbstractWe conducted a field experiment at the geotechnical research soil site #1 in Ottawa, Ontario, Canada, and recorded 9-C seismic data along a short line traverse 90 m in length using a multicomponent vibrator source named Microvibe and a landstreamer receiver array with 48 3-C 28-Hz geophones at 0.75-m intervals. The receiver spread length is 35.25 m, and the near-offset is 1.50 m. We used three source and three receiver orientations - vertical (V), inline-horizontal (H1), and transverse-horizontal (H2). We identified several reflection wave modes in the field records - PP, PS, SP, and SS, in addition to refracted waves, and Rayleigh-mode and Love-mode surface waves. We computed the semblance spectra of the selected shot records and ascertained the wave modes based on the semblance peaks. We then performed CMP stacking of each of the 9-C data sets using the PP, PS/SP, and SS stacking velocities. This field test convincingly demonstrates that there is no pure P- or S-wave land seismic source - any source type can generate any combination of wave modes - PP, PS, SP, and SS, and partitioning of the source energy depends on the source orientation and VP/VS ratio. All three receiver orientations will capture all reflected wave modes - PP, PS, SP, and SS - but with varying strength. The magnitude of the reflection amplitude captured by one of the three receiver orientations will depend on the reflector depth, source-receiver offset, and the near-surface P- and S-wave velocities in the vicinity of the receiver location. The most prominent PP reflection energy is recorded by the VV source-receiver orientation, whereas the most prominent SS reflection energy is recorded by the H2H2 source-receiver orientation. Additionally, the optimum source-receiver orientation for PS reflection mode is VH1, and the optimum source-receiver orientation for SP reflection mode is H1V.
Summary(Plain Language Summary, not published)
A nine components seismic reflection has been conducted over the geotechnical research soil site #1. The most prominent PP reflection energy is recorded by the VV source-receiver orientation, whereas the most prominent SS reflection energy is recorded by the H2H2 source-receiver orientation. Additionally, the optimum source-receiver orientation for PS reflection mode is VH1, and the optimum source-receiver orientation for SP reflection mode is H1V.
GEOSCAN ID313528