Method of determining, displaying and using the relative changes of elastic modulus and density of underground rock

摘要

PCT No. PCT/CN96/00104 Sec. 371 Date Sep. 29, 1998 Sec. 102(e) Date Sep. 29, 1998 PCT Filed Nov. 20, 1996 PCT Pub. No. WO97/19370 PCT Pub. Date May 29, 1997The general object of the present invention is to provide a method for determining 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/oil 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 /[ kappa +(4/3) mu ], the relative change of bulk modulus DELTA kappa /[ kappa +(4/3) mu ]; and the relative change of density is DELTA rho / rho .