Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1989-11-01
1991-04-02
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 33, G01V 140
Patent
active
050051598
ABSTRACT:
A method of determining the continuity of a lithographic layer located between two vertical boreholes is disclosed. A seismic source is lowered in the first borehole while simultaneously a receiver pair, preferably a pair of "vertical" geophones spaced apart by about two feet, are lowered in the second borehole to develop a "differenced signal". The recording of high amplitude signals within a layer is an indication of a continuous, low velocity layer. The middle of a layer can also be discovered using a single vertical receiver and finding the place of phase reversal.
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"Channel Waves as a Tool of Applied Geophysics in Coal Mining", Theodore C. Krey, Geophysics, Oct. 1963, pp. 701-714.
Exxon Production Research Company
Lobo Ian J.
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