Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1981-11-18
1983-08-09
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 75, 364421, G01V 132, G01V 134
Patent
active
043982735
ABSTRACT:
The present invention indicates that acoustic characteristics associated with gas/oil-containing strata of an earth formation, including reflectivity coefficients can be normalized (and favorably compared) with similar characteristics calculated and displayed by means of a machine-implemented data processing method in which well logging and geologic data are fed thereto to calculate such characteristics without the need for shear-wave velocities.
In more detail, in accordance with the invention brine-saturated bulk and shear moduli, (i.e., Kw* and Gw*) of the strata of interest can be predicted as a function of, say, brine-saturated P-wave modulus (Pw*) alone (independent of shear-wave velocity). In that way, resulting acoustic values including seismic velocities and amplitudes (also, reflectivities) as a function of saturation can ultimately be provided. Such values, when compared to actual field-generated characteristics, are surprisingly accurate predictors of the amount of gas/oil saturation in the zone of interest. The method has particular applicability to designating gas-sand zones within formations of interest.
REFERENCES:
patent: 3241102 (1966-03-01), Peterson
patent: 4293933 (1981-10-01), Park et al.
Levitsova et al., "Razvedochnaya Geofizika", 1966, pp. 3-17, #15, G-222.
Brown Robert J. S.
Runge Richard J.
Thompson Don D.
Chevron Research Company
Keeling Edward J.
Messner H. D.
Moskowitz Nelson
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