1D reconnaissance
A “first-pass” interpretation approach with which the gross trends present in the data can be examined. It is likely that significant and extensive resistive features will be recovered from such an approach, whilst smaller-scale and higher dimensional features are less likely to be adequately constrained. Reconnaissance is also used to obtain a broad overview of the class of resistivity structures to which the data are sensitive.
An associated routine allows reference responses to be calculated in a number of ways, including complex statistical extraction from a full CSEM dataset. This module then allows the CSEM amplitude with offset response, within a user selectable amplitude range, to be normalised by the response from a reference.
The normalised responses can be plotted for each receiver location and for each frequency present in the CSEM dataset.
This tool enables the OHM geophysicist to investigate the significant trends in the dataset, providing forward model derived sections of major geo-electric structure and can be a valuable aid to 2D inversion monitoring.