公开(公告)号：US20190187319A1

公开(公告)日：2019-06-20

申请号：US16273256

申请日：2019-02-12

Applicant: CGG SERVICES SAS

Inventor： Adam SMIAROWSKI ,  Jason BERRINGER ,  Philip MILES

IPC: G01V3/16 ,  G01V3/17

CPC classification number: G01V3/16 ,  G01V3/17

Abstract: An electromagnetic geophysical exploration system includes a first transmitter-receiver pair that includes a first transmitter configured to transmit a first waveform in a first spectrum and a first receiver configured to sense signals in the first spectrum; and a second transmitter-receiver pair that includes 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, and a second receiver configured to sense signals in the second spectrum; and a control portion. The control portion controls the first transmitter to transmit the first waveform with a first given strength or shape in the first spectrum, and controls the second transmitter to transmit the second waveform with a second given strength or shape in the second spectrum, after a specified time delay.

公开(公告)号：US20180081075A1

公开(公告)日：2018-03-22

申请号：US15542169

申请日：2015-12-16

Applicant: CGG SERVICES SAS

Inventor： Adam SMIAROWSKI ,  Philip MILES

IPC: G01V3/16 ,  G01R33/00 ,  G01V3/165

CPC classification number: G01V3/16 ,  G01R33/0029 ,  G01V3/165 ,  G01V3/17

Abstract: A computing device and method for removing noise associated with an excitation signal and its odd harmonics. A computing system for processing electromagnetic (EM) signals includes an interface that receives raw data indicative of a time rate of change of a magnetic field as recorded with a receiver coil while airborne, wherein the magnetic field includes a primary source excitation; and a processor connected to the interface. The processor is configured to calculate a rotation of the receiver coil relative to a desired orientation; derotate the raw EM data based on the rotation of the receiver coil relative to the desired orientation and on the primary source excitation, to obtain derotated EM data; and generate an image of a surveyed subsurface based on the derotated EM data.

公开(公告)号：US20180180759A1

公开(公告)日：2018-06-28

申请号：US15738685

申请日：2016-08-31

Applicant: CGG SERVICES SAS

Inventor： Adam SMIAROWSKI ,  Greg HODGES

IPC: G01V3/36 ,  G01V3/16 ,  G01V3/165

Abstract: A device and method for calculating electrical properties of a surveyed underground formation. The method includes selecting a waveform having multiple current transition rates; placing a time-domain electromagnetic (TEM) system above the underground formation while generating with a transmitter a transient primary magnetic field during an on-time period and no magnetic field during a following off-time period, due to the waveform; and recording with a receiver magnetic related data generated by the earth as a result of the transient primary magnetic field. The receiver records the magnetic related data during the on-time period using plural on-time gates sampling.