Method for interpretation of seismic records to yield...

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

G - Physics

01

V

349/20

G01V 1/34 (2006.01) G01V 1/30 (2006.01) G01V 1/36 (2006.01)

Patent

CA 1240026

ABSTRACT OF THE DISCLOSURE METHOD FOR INTERPRETATION OF SEISMIC RECORDS TO YIELD INDICATIONS OF GASEOUS HYDROCARBONS 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 occurs. Thus, differentiating between high-intensity amplitude anomalies of nongas- and gas-containing media is simplified: progressive change in amplitude intensity of resulting traces generated by the field array as a function of offset between each source- detector pair, is associated with the last-mentioned medium only.

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