Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1981-12-29
1985-08-06
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 56, 364421, G01V 100
Patent
active
045340196
ABSTRACT:
A novel method for determining and displaying the shear-velocity reflectivities of geologic formations is disclosed wherein a compression-wave common-depth-point seismic-data-gathering technique is utilized to produce both normal incidence compressional-velocity reflectivity sections and shear-velocity reflectivity sections for reflection points in given geologic formations. The subject method includes the gathering of common-depth-point information for a plurality of incidence angles, (theta) and estimating the linear coefficients (R.sub.pp,0 and R.sub.pp,1) of a linear function fitted to the amplitudes vs. sin.sup.2 (theta) measured for each point of reflection. The common-depth-point gather is conducted at angles of offset of less than 20-30 degrees such that assumptions concerning various elastic parameters: density, compressional wave velocity and shear-wave-velocity can be made which allow the application of linear fitting techniques to the gathered data. The sum of these coefficients corresponds to the shear-velocity reflectivity of the reflection point and may be presented with similar data for other points in appropriate shear-reflectivity sections.
REFERENCES:
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T.I.L.E. Joint Venture, dated 5/17/81 and attached trade literature.
Kenny George S.
McClure Carroll D.
Wiggins Ralphe
Gilman Michael G.
Lobo Ian
McKillop Alexander J.
Mobil Oil Corporation
Moskowitz Nelson
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