3D EM Modelling and Inversion with Open Source Resources · PDF file 3D EM Modelling and...

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Transcript of 3D EM Modelling and Inversion with Open Source Resources · PDF file 3D EM Modelling and...

  • 3D EM Modelling and Inversion with Open Source Resources

    1https://courses.geosci.xyz/aem2018

    https://courses.geosci.xyz/aem2018

  • Thanks to…

    2

    Esben Anders AEM

    Esben Auken Anders Vest Christiansen

  • Introduction

    3

  • Airborne EM: Tli Kwi cho (TKC) kimerlites

    4

    DIGHEM (Quadrature 56kHz)

    Location map at TKC

    VTEM (90 μs)

  • Frequency domain DIGHEM survey (1992)

    5

    DIGHEM (Quadrature 56kHz)

    Configuration HCP

    Frequency 900Hz-56kHz

    Data unit ppm

    Line spacing 200 m

    Line km 52 km

    # of sounding 6274

  • Time domain VTEM survey (2003)

    6

    VTEM (90 μs)

    Configuration Colocated-loop

    Off time channel 90-6340 (μs) Data unit pV/A-m4

    Line spacing 75 m

    Line km 39 km

    # of sounding 26342

  • Airborne EM surveys: FDEM and TDEM

    7

    DIGHEM (Quadrature 56kHz) VTEM (90 μs)

    Two airborne data sets: What to do?

  • Questions • Discover a pipe? • Find structural details? • Pipe is 3D. What are the fields and

    fluxes? • Inversion: Can I use 1D? • Need 3D? Everywhere? Over sub-

    region? • How to carry out a 3D inversion?

    – Access to software? – Need to build something myself?

    • If I need to build software, what are the challenges?

    • Can I collaborate? • What is Open Source?

    8

  • Agenda for today

    9