Patent ID: 8560241
Filing Date: 2013-10-15
Classification: E21B,G01V,G16Z,Y10T

Abstract:
1. A method for surveying, comprising: detecting a first signal at a first time, the first signal generated by a subsurface earth formation in response to a passive-source electromagnetic signal, wherein the first signal is generated by an electroseismic or seismoelectric conversion of the passive-source electromagnetic signal; detecting a second signal at a second time, the second signal generated by the subsurface earth formation in response to a passive-source electromagnetic signal, wherein the second signal is generated by an electroseismic or seismoelectric conversion of the passive-source electromagnetic signal; sending the first and second signals to a processor, wherein the processor is configured to determine one or more time-dependent properties of the subsurface earth formation, based, at least in part, on the first signal and the second signal.