Systems and methods for multiple bandwidth electromagnetic geophysical exploration

Patent metadata

Field	Value
Publication number	US-2017045638-A1
Application number	US-201515305769-A
Country	US
Kind code	A1
Filing date	Apr 21, 2015
Priority date	Apr 23, 2014
Publication date	Feb 16, 2017
Grant date	—

Abstract

A system and method for electromagnetic geophysical exploration is provided. The system includes a first transmitter ( 210 ) configured to transmit a first waveform in a first spectrum and a first receiver ( 212 ) configured to sense signals in the first spectrum. The system also includes a second transmitter ( 220 ) configured to transmit a second waveform in a second spectrum, and a second receiver ( 222 ) configured to sense signals in the second spectrum and minimum-coupled to the second transmitter. The second spectrum has a frequency higher than a frequency of the first spectrum. The system further includes a control portion configured to control the first transmitter to transmit the first waveform, and control the second transmitter to transmit the second waveform after a specified time delay. The control portion is configured to receive signals sensed by the first receiver in the first spectrum, and receive signals sensed by the second receiver in the second spectrum.

First claim

What is claimed is:

1 . An electromagnetic geophysical exploration system comprising:
a first transmitter configured to transmit a first waveform in a first spectrum; a first receiver configured to sense signals in the first spectrum; a second transmitter configured to transmit a second waveform in a second spectrum, the second spectrum having a frequency higher than a frequency of the first spectrum; a second receiver configured to sense signals in the second spectrum, the second receiver configured to be minimum-coupled to the second transmitter; and a control portion configured to:
control the first transmitter to transmit the first waveform in the first spectrum;
control the second transmitter to transmit the second waveform in the second spectrum after a specified time delay;
receive signals sensed by the first receiver in the first spectrum; and
receive signals sensed by the second receiver in the second spectrum.

2 . The system of claim 1 , wherein the control portion is further configured to store the received signals.

3 . The system of claim 2 , wherein the control system is further configured to process the stored signals to analyze a subsurface formation.

4 . The system of claim 1 , wherein the first waveform includes a different waveform shape from the second waveform.

5 . The system of claim 1 , wherein the first spectrum and the second spectrum include an overlapping bandwidth portion.

6 . The system of claim 1 , wherein the second transmitter is configured to minimize a turn-off time for the second waveform.

7 . The system of claim 1 , wherein the first transmitter is a low-frequency transmitter and the first receiver is a low-frequency receiver.

8 . The system of claim 1 , wherein the second transmitter is a high-frequency transmitter and the second receiver is a high-frequency receiver.

9 . The system of claim 1 , wherein the signals sensed by the first receiver in the first spectrum are sensed during transmission of the first waveform by the first transmitter.

10 . A method of electromagnetic geophysical exploration, comprising:
controlling a first transmitter to transmit a first waveform in a first spectrum; controlling a second transmitter to transmit a second waveform in a second spectrum after a specified time delay, the second spectrum having a frequency higher than a frequency of the first spectrum; receiving signals sensed by a first receiver in the first spectrum; and receiving signals sensed by a second receiver in the second spectrum, the second receiver configured to be minimum-coupled to the second transmitter.

11 . The method of claim 10 , further comprising storing the received signals.

12 . The method of claim 11 , further comprising processing the stored signals to analyze a subsurface formation.

13 . The method of claim 10 , wherein the first waveform includes a different waveform shape from the second waveform.

14 . The method of claim 10 , wherein the first spectrum and the second spectrum include an overlapping bandwidth portion.

15 . The method of claim 10 , wherein the second transmitter is configured to minimize a turn-off time for the second waveform.

16 . A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to:
control a first transmitter to transmit a first waveform in a first spectrum; control a second transmitter to transmit a second waveform in a second spectrum after a specified time delay, the second spectrum having a frequency higher than a frequency of the first spectrum; receive signals sensed by a first receiver in the first spectrum; and receive signals sensed by a second receiver in the second spectrum, the second receiver configured to be minimum-coupled to the second transmitter.

17 . The medium of claim 16 , wherein the processor is further caused to store the received signals.

18 . The medium of claim 17 , wherein the processor is further caused to process the stored signals to analyze a subsurface formation.

19 . The medium of claim 16 , wherein the first waveform includes a different waveform shape from the second waveform.

20 . The medium of claim 16 , wherein the first spectrum and the second spectrum include an overlapping bandwidth portion.

Assignees

• Cgg Services Sa

Inventors

• Smiarowski Adam
• Berringer Jason
• Miles Philip

Classifications

• G01V3/16 Primary

  specially adapted for use from aircraft (G01V3/165 - G01V3/175 take precedence) · CPC title

• G01V3/17

  operating with electromagnetic waves {(operating with millimetre waves G01V8/005)} · CPC title