| 摘要 |
<p>A METHOD FOR ELECTROMAGNETIC EXPLORATION INCLUDES IMPARTING (60) A FIRST ELECTROMAGNETIC SIGNAL (T1) INTO SUBSURFACE FORMATIONS AND IMPARTING (60) A SECOND ELECTROMAGNETIC SIGNAL (T2) INTO THE FORMATIONS SUBSTANTIALLY CONTEMPORANEOUSLY WITH IMPARTING (60) THE FIRST ELECTROMAGNETIC SIGNAL (T1). THE FIRST AND SECOND ELECTROMAGNETIC SIGNALS (T1, T2) ARE SUBSTANTIALLY UNCORRELATED WITH EACH OTHER. A COMBINED ELECTROMAGNETIC RESPONSE (SR) OF THE FORMATIONS TO THE FIRST AND SECOND IMPARTED ELECTROMAGNETIC SIGNALS IS DETECTED. A RESPONSE OF THE FORMATIONS TO EACH OF THE FIRST AND THE SECOND IMPARTED SIGNALS IS DETERMINED FROM THE DETECTED RESPONSE.</p> |
