Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1985-03-11
1987-09-08
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
364421, G01V 128
Patent
active
046929100
ABSTRACT:
Methods and related apparatus are described for determining lithological characteristics, such as formation material type and porosity, of an underground formation by utilizing compressional velocity (V.sub.p) and shear velocity (V.sub.s) data. One described method utilizes the plotting of V.sub.p and/or V.sub.s versus a Seismic Parameter, such ad K/.rho. or the Bulk Velocity, and boundaries of velocity values of certain formation material types to define a field of data points. By comparing the position of the data points to the boundaries of the formation material types, the formation material type and, later, porosity can be determined. A method is described for determining the presence of a hydrocarbon gas at a particular location in an underground formation utilizing the above methods. Also, a method is described for determining V.sub.s from V.sub.p data and obtained ratios of V.sub.p and V.sub.s for at least one formation material type.
REFERENCES:
patent: 4373197 (1983-02-01), Gassaway et al.
patent: 4375090 (1983-02-01), Thompson et al.
McCormack et al., "A Care Study of Stratigraphic . . . " Geophysics, vol. 49, #5.
Nations, J. F., "Lithology and Porosity from Acoustic Shear and Compressional . . . " 15 Annual Logging Symposium of SPWLA, 6/2/74 Tencs.
Eastwood et al. "Basis for Interpretation of Vp/Vs Ratios in Complex Lithologies," SPWLA 24th Logging Symp., 6/27/83.
Frisillo Albert L.
Norris Janice O.
Sondergeld Carl H.
Amoco Corporation
Brown Scott H.
Hook Fred E.
Lobo Ian J.
Tarcza Thomas H.
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