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

摘要

The 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 &Dgr;&lgr;/(&lgr; +2&mgr;) , the relative change of shear modulus &Dgr;&mgr;/(&lgr;+2&mgr; ) and/or &Dgr;&mgr;/[&kgr;+(4/3)&mgr;], the relative change of bulk modulus . DELTA.&kgr;/[&kgr;+(4/3)&mgr;]; and the relative change of density is . DELTA.&rgr;/&rgr;.