Method for identifying resistivity anomalies in...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science

Reexamination Certificate

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C702S014000

Reexamination Certificate

active

07383132

ABSTRACT:
Method for enhancing resistive anomalies in electromagnetic geophysical survey data. Scaled values of a measured electromagnetic field parameter are plotted on a depth section at locations related to corresponding source/receiver locations. Scaling is performed relative to a reference signal selected to represent a baseline free of unknown resistive bodies. Scaled values are represented by a color scale in the display, and the color scale may be adjusted to enhance perceived anomalies. The method may be employed in either the frequency domain or the time domain.

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patent: WO/03-048812 (2003-06-01), None
patent: WO/2004-083898 (2004-09-01), None
Chave, A.D., Constable, S. and Edwards, R.N. (1991) “Electrical Exploration Methods for the Seafloor”,Electromagnetic Methods in Applied Geophysics, pp. 931-966, Society of Exploration Geophysicists.
Eidesmo, T., et al. (2002) “Sea Bed Logging (SBL), a New Method for Remote and Direct Identification of Hydrocarbon Filled Layers in Deepwater Areas”,First Break20.3, 144-152.
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MacGregor, L., Sinha, M. and Constable, S. (2001) “Electrical Resistivity Structure of the Valu Fa Ridge, Lau Basin, from Marine Controlled-Source Electromagnetic Sounding”,Geophy. J. Int. 146, 217-236.
Sheriff, R.E. (2002)Encyclopedic Dictionary of Applied Geophysics, Society of Exploration Geophysicists, 4th edition, pp. 278-279.
EP Search Report No. 112502US dated Aug. 8, 2005 (1 page).

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