Recent Controlled Source EM results show positive impact on exploration at Shell

Application of Electromagnetic Scanning to an Australian Frontier Basin with Complex Bathymetry

“…For traditional, target-oriented seabed logging surveys, it has been customary to identify a single receiver off the prospect and to use its measured response to normalize the responses of other receivers [5], [6]. Implicit in this approach is the assumption that variations in background geology and bathymetry are minimal over the survey area.…”

CSEM technology as a value driver for hydrocarbon exploration

“…Serious efforts to develop the concept in the 1980's came to an abrupt end with the sudden fall in oil prices simultaneously with successful implementation of 3D seismic data. However, during the past few years we have seen an increasing focus on the use of CSEM technology for direct hydrocarbon detection Ellingsrud et al, 2002;Røsten et al, 2003) and recently, a number of success stories have been published (Choo et al, 2006;Hoversten et al, 2006;Smit et al, 2006).…”

Time synchronization for marine controlled source electromagnetic recorder

“…The MCSEM method gets towed controlled-source electromagnetic signal (signal band is 200s to 20Hz) [4][5] through the submarine multiple receivers. This method combines with controlled source current data and navigation data to obtain AVO (Amplitude versus Offset) and PVO (Phase versus Offset) data, and it gets shallow submarine resistivity information [4][5][6] after one-dimensional resistivity inverse.…”

“…This method combines with controlled source current data and navigation data to obtain AVO (Amplitude versus Offset) and PVO (Phase versus Offset) data, and it gets shallow submarine resistivity information [4][5][6] after one-dimensional resistivity inverse. The MCSEM method requires high-precision seabed electromagnetic signals observed, however, electric signal is very weak in the marine environment [7][8][9] .…”