Process for directly detecting the presence of hydrocarbons...

Details Process for directly detecting the presence of hydrocarbons... Process for directly detecting the presence of hydrocarbons...

G - Physics

01

V

349/14

G01V 1/30 (2006.01)

Patent

CA 1277760

A B S T R A C T A process for directly detecting the presence of hydrocarbons in a rock formation includes generating a plurality of seismic rays at spaced intervals from one another above or within the surface of the rock formation being surveyed to form a normal move-out corrected common mid-point gather; determining an approximate angle of incidence for each seismic ray; applying predetermined weighting factors to time samples of each of the reflected rays before stacking the time samples to form a trace; extracting the reflectivity of compressional longitudinal waves (p-waves) and shear waves (s-waves) of each sample; determining the p-wave reflectivity as a function of the s-wave reflectivity; and subtracting the p-wave reflectivity so determined from the extracted p-wave reflectivity thereby to define a fluid factor which gives a direct indication of the presence of hydrocarbons in the rock formation being surveyed.

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