Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1981-08-17
1983-08-16
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 73, 364421, G01V 130
Patent
active
043995250
ABSTRACT:
The present invention indicates that acoustic characteristics associated with a first well penetrating a gas/oil-containing strata such as a sandstone, limestone or dolostone, can be normalized (and favorably compared) with similar characteristics of a second, contiguous well of known hydrocarbon potential, such characteristics being 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 a sandstone, limestone or dolostone penetrated by the second well 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 distinct velocity and amplitude values as a function of a saturation operator can ultimately be provided. Such values, when compared to actual, in-well, field-generated characteristics of the first well, are surprisingly accurate predictors of the amount of gas/oil maturation in and around the first well. The method has particular accuracy in designating gas zones within formations of interest due to use of the complete Benedict-Webb-Rubin non-ideal gas law in pseudo-reduced form.
REFERENCES:
patent: 3241102 (1966-03-01), Peterson
Zemtsova et al., "Rogvedochnaya Geofizika", 1966, pp. 3-17, #15, 367/75.
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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