Electrodynamic seismic
(Safonov A.S. )
The article demonstrates field data, proving the possibility of registering characteristics of the general seismic and «frozen» electromagnetic waves in the oil and gas depth interval. A new method - Electrodynamic Seismic - is proposed. Thе method registers seismic and electromagnetic waves, induced in the earth by seismic waves. Generalized theory of these processes is considered. Problems of geological interpretation of the EDS data, especially the frequency depending attributes are considered. The fluid compositions may be established by assistance reflecting coefficients of the 3D seismic survey. The anomalies of seismic attribute’s dispersion are caused into oil-water-contact zones by the electromagnetic polarization effects also. The reason of seismic attributes variation is the joint effects the two mechanisms namely the well-known viscous absorb and the new part - seismoelectricity. We propose a new seismic attributes. These attributes explains the link between the permeability and electrical properties of rocks. High performance of these frequency variable attributes for oil and gas surveys is shown. The plan of the development of the EDS work is scheduled.......