The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 31, 1985
Filed:
Oct. 28, 1981
William J Ostrander, Novato, CA (US);
Chevron Research Company, San Francisco, CA (US);
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.