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GEOREF RECORD

V (sub p) V (sub s) from mode-converted P-SV reflections

William P. Iverson, Bill A. Fahmy and Scott B. Smithson
V (sub p) V (sub s) from mode-converted P-SV reflections
Geophysics (July 1989) 54 (7): 843-852

Abstract

P-SV reflections are generated by a compressional-wave source and result from P waves that are converted to shear (SV) waves upon reflection. Recording both the P and SV components yields compressional and shear data simultaneously. Verifying that the easily detected events really are P-SV reflections is accomplished by noting the good correlation of surface CDP data with vertical seismic profile (VSP) reflections. Stacking velocities from P-SV CDP gathers determine the V (sub p) V (sub s) product when source-to-receiver offset is less than the depth of the reflector but data from synthetic models show that P-SV reflections are nonhyperbolic for shallow reflections or when source-to-receiver offset is too large.Shear velocity (V (sub s) ) can be calculated from P-SV reflections by one of two techniques: comparison of stacked section P-P and P-SV reflection times or by using the P-P and P-SV stacking velocities. Unfortunately, most P-SC reflections on a P-SV seismic section do not necessarily originate from exactly the same depth as P-P reflections. When this depth discrepancy occurs, the reflection-time comparison technique fails. In addition, V (sub s) cannot be calculated from P-SV reflections, and we must settle for the V (sub p) V (sub s) product from P-SV reflection stacking velocities. When P-SV stacking velocities are input to the familiar Dix equation, the resulting interval velocities yield the V (sub p) V (sub s) product.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 54
Serial Issue: 7
Title: V (sub p) V (sub s) from mode-converted P-SV reflections
Affiliation: Univ. Wyo., Dep. Pet. Eng., Laramie, WY, United States
Pages: 843-852
Published: 198907
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 18
Accession Number: 1989-048347
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Presented at the 58th ann. int. meet., Soc. of Explor. Geophys.
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 1989
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