3. Resistivities of Rocks Diagram courtesy Henri Brasse http://userpage.fu-berlin.de~hbrasse
4. Fluid saturation and rock properties P-wave velocity is affected only slightly by hydrocarbon saturation in a porous rock. Resistivity can vary by more than an order of magnitude. Picture redrawn from Wilt M. and Alumbaugh D. 1998, The Leading Edge 17, 487-492.
5. Direct Resistivity Indicator Seismic traces Seismic amplitudes and attributes Logging measurements Logging before drilling MTEM Resistivity
22. Receiver station and battery Receiver box and battery in the line. Box with acquisition and telemetry electronics. Grounded with earth electrode.
23. Source Buggy and Unit Source buggy with generator and source unit. Source engineer with Zonge and control electronics.
24. Source Electrodes An array of 1 to 40 electrodes hammered into 80-100cm into the ground. Fenced off (3m) and manned when source cables are connected.
25. Source Safety system Source activation and emergency shut off at the source electrode array. Emergency shutoff cuts power to the entire system.
26. Source electrode transport Source electrode transport buggy. Low ground pressure buggy to transport the 40 electrodes per source pole location.
Multi Transient ElectroMagnetics. Table of content: (sorry Add 3 to numbers above 9!) 2-5 What MTEM is. Logging Before Drilling 6-9 MTEM applications 10-11 EM techniques 12-21 MTEM method 22-26 – France test and Reciprocity 27-40 RTA 41-46 Processing and Inversion 47-49 Data Examples 49-50 Recording System 51 Conclusion