Method for interpretation of seismic records to yield indicating

Details Method for interpretation of seismic records to yield indicating Method for interpretation of seismic records to yield indicating

1981-10-28

1985-12-31

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 74, 367 50, 367 59, G01V 134, G01V 136

Patent

active

045625581

ABSTRACT:
The present invention indicates that gas-containing strata of an earth formation have low Poisson's ratios and that the acoustic contrast (with the overburden rock) has a surprising effect as a function of the angle of incidence on a seismic wave associated with an array of sources and detectors: viz., a significant--and progressive--change in P-wave reflection coefficient as a function of the angle of incidence (within a gather of data) indicates the lithology of the reflecting horizon and the capping strata. Thus, lithologic determinations of high-intensity anomalies of gas-containing media is simplified: (i) progressive increases in amplitude intensity of resulting traces generated by the field array as a function of offset between respective source-detector pairs, can be associated with high porosity sandstones; underlying impervious shales; and (ii) progressive decreases in amplitudes of likewise commonly gathered traces, is associated with medium-to-low porosity lime-stones underlying a similar type of shale.

REFERENCES:
patent: 4316267 (1982-02-01), Ostrander
patent: 4316268 (1982-02-01), Ostrander

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