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Anisotropic Controlled-Source Electromagnetic (CSEM) Inversion near the “Tiger” Well in Alaminos Canyon Block 818, Gulf of Mexico
We present anisotropic 2.5D inversion examples illustrating the possibility to image a resistor beneath gas hydrates with marine controlled-source electromagnetic (CSEM) data. The inversion examples are from a large CSEM survey conducted in 2008 in Alaminos Canyon (AC), covering part of the Perdido Fold Belt. The focus of our study is on a part of the survey which is co-located with a recent partially published well, AC818-#1 (“Tiger”), and was acquired with very dense receiver spacing (0.5 km) and a source waveform with main frequencies of 0.5 Hz and higher. The resulting resistivity sections accurately recover the two most prominent features from the well independent of the assumed background model: shallow hydrates at the top of the Oligocene Frio sand, as well as a high resistivity anomaly discovered in the Eocene Wilcox Formation at the crest of the anticline. Both in terms of depth and structure, the CSEM, seismic, and well log data results agree well, even when the CSEM inversion is not constrained by a priori information in the form of seismic horizons.
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