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1. (WO2017037536) APPARATUS AND METHOD FOR DETERMINING EARTH'S NEAR-SURFACE PROPERTIES WITH ON-TIME MEASUREMENTS FROM AIRBORNE TIME-DOMAIN ELECTROMAGNETIC DATA

Pub. No.:    WO/2017/037536    International Application No.:    PCT/IB2016/001334
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Sep 01 01:59:59 CEST 2016
IPC: G01V 3/06
G01V 3/17
Applicants: CGG SERVICES SAS
Inventors: SMIAROWSKI, Adam
HODGES, Greg
Title: APPARATUS AND METHOD FOR DETERMINING EARTH'S NEAR-SURFACE PROPERTIES WITH ON-TIME MEASUREMENTS FROM AIRBORNE TIME-DOMAIN ELECTROMAGNETIC DATA
Abstract:
A device and method for calculating electrical properties of a surveyed underground formation. The method includes selecting (1300) a waveform (300) having multiple current transition rates; placing (1302) a time-domain electromagnetic (TEM) system (1100) above the underground formation while generating with a transmitter (1102) a transient primary magnetic field during an on-time period and no magnetic field during a following off-time period, due to the waveform (300); and recording (1304) with a receiver (1104) magnetic related data generated by the earth as a result of the transient primary magnetic field. The receiver (1104) records the magnetic related data during the on-time period using plural on-time gates sampling.