The values of VSP in interpretation

Stewart, Robert R.; DiSiena, James

doi:10.1190/1.1439597

Cited by 6 publications

(1 citation statement)

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“…The use of synthetic seismograms also extends to the integration of surface seismic and VSP data (e.g. Stewart and Disiena, 1989;Geis et al, 1990) leading to improvements in data interpretation.…”

Section: Introductionmentioning

confidence: 99%

Full‐waveform processing and interpretation of kilohertz cross‐well seismic data

1993

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High‐frequency, cross‐well seismic data, from the Midale oil field of southeastern Saskatchewan, are analyzed for direct and reflected energy. The goal of the analysis is to produce interpretable sections to assist in enhanced oil recovery activities ([Formula: see text] injection) in this field. Direct arrivals are used for velocity information while reflected arrivals are processed into a reflection image. Raw field data show a complex assortment of wave types that includes direct compressional and shear waves and reflected shear waves. A traveltime inversion technique (layer stripping via ray tracing) is used to obtain P‐ and S‐wave interval velocities from the respective direct arrivals. The velocities from the cross‐well inversion and the sonic log are in reasonable agreement. The subsurface coverage of the cross‐well geometry is investigated; it covers zones extending from the source well to the receiver well and includes regions above and below the source/receiver depths. Upgoing and downgoing primary reflections are processed, in a manner similar to the vertical seismic profiling/common‐depth‐point (VSP/CDP) map, to construct the cross‐well images. A final section is produced by summing the individual reflection images from each receiver‐gather map. This section provides an image with evidence of strata thicknesses down to about 1 m. Synthetic seismograms are used to interpret the final sections. Correlations can be drawn between some of the events on the synthetic seismograms and the cross‐well image.

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Section: Introductionmentioning

confidence: 99%