Uncertainty-based frequency-selected inversion of electromagnetic geophysical data

摘要

Disclosed are methods and apparatus using frequency-selected electromagnetic inversion to obtain sub-surface geophysical characteristics. One embodiment relates to a computer-implemented method for inverting an electromagnetic geophysical data signal to obtain an earth response. The method involves computing uncertainties associated with an electromagnetic geophysical data signal and selecting subset of frequencies based on the uncertainties. The electromagnetic geophysical data signal may then be inverted for the subset of the frequencies to determine the earth response. Other embodiments, aspects, and features are also disclosed.

主权项

1. A method of electromagnetic geophysical data acquisition and processing, the method comprising:
acquiring an electromagnetic geophysical data signal using at least one electromagnetic source and a plurality of electromagnetic sensors; computing, using a computer apparatus comprising at least a processor, memory and executable code, quantified uncertainties associated with the electromagnetic geophysical data signal; selecting, using the computer apparatus, a subset of frequencies based on the quantified uncertainties by a process loop that computes quantified uncertainties for a plurality of candidate subsets of frequencies, each said candidate subset comprising a plurality of frequencies and including less than a set of all frequencies in the electromagnetic geophysical data signal, and selects one candidate subset of frequencies having a minimum quantified uncertainty; inverting, using the computer apparatus, the electromagnetic geophysical data signal for the subset of the frequencies to determine the earth response; and using the spatial distribution in locating hydrocarbons for recovery.