A METHOD FOR DETERMINING, DISPLAYING AND UTILIZING THE RELATIVE CHANGES OF ELASTIC MODULI AND THAT OF DENSITY OF GEOLOGIC FORMATIONS

摘要

The general object of the present invention is to provide a method for deter mining and displaying the relative changes of elastic moduli and that of density of geologic formations and for utilizing these relative changes and plottings for gas/oi l exploration, especially for direct gas and light oil detection. The said relative changes of elastic moduli are the relative change of Lame constant .DELTA..lambda./(.lambda.+2. mu.), the relative change of shear modulus .DELTA..mu./(.lambda.+2.mu.) and/or .DELTA..mu./[k+(4/3.mu.], the re lative change of bulk modulus .DELTA.k/[k+(4/3).mu.]; and the relative change of density is .DELTA.p/p.