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Working towards all the geophysics - but backwards.

Rowan Cockett, Seogi Kang & SimPEG Team

July 12, 2016

Geophysical Inversion Facility

University of British Columbia

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Working towards all the geophysics - but backwards.

Rowan Cockett, Seogi Kang & SimPEG Team

July 12, 2016

some of

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The Subsurface

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Option 1: Dig it up?

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Option 2: Drill it?

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Option 3: Use geophysics!

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Physical properties

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The world is 3D

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Gravity

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Magnetics

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Direct current resistivity

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Seismic

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Magnetotellurics

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What is the structure of the framework that will bring these geophysical methods together?

Investigate the methods and constraints that are necessary for a framework to support
Literature review on previous methods

There are many instances and examples of how to bring data types together, however, there are still a number of questions on how to abstract these types of methods for them to work in

This is a scientifically and practically challenging task \citep{Li2000a, lelievre2009integrating}. These challenges, compounded with inconsistencies between different data sets, often makes the integration and implementation complicated and/or non-reproducible. The development of new methodologies to address these challenges will build upon, as well as augment, standard practices; this presupposes that researchers have access to consistent, well-tested tools that can be extended, adapted and combined.

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Implementation

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Interactive Geophysics!

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Survey & Problem

Data collection and geometry

Physics

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Finite Volume

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Creating a Mesh

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DC Resistivity

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DC Resistivity

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Time Domain Electromagnetics

32 lines of code

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Implementation

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Inversion Elements

Data Misfit

Regularization

Inverse Problem

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Optimization

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Bringing it together.

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Heagy et al. 2016 - in prep

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Where are the diamonds?

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Where are the diamonds?

Kimberlite Pipe

Different geologic units
Specific units is diamond-rich

Physical Properties

Low density
Moderate susceptibility
High conductivity

Physical properties

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Gravity

The world is 3D

Rock model?

Recovered 3D Density

Vertical section

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Magnetics

The world is 3D

Rock model?

Recovered 3D Susceptibility

Vertical section

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Direct Current (DC)

The world is 3D

Rock model?

Recovered 3D Conductivity

Vertical section

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Magnetotellurics (MT)

The world is 3D

Rock model?

Recovered 3D Conductivity

Vertical section

1000 Hz

21544 Hz

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Integration or Interpretation?

Diamond-rich kimberlite

Low density
Moderate susceptibility
High conductivity

Rock model?

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Integration or Interpretation?

Diamond-rich kimberlite

Low density
Moderate susceptibility
High conductivity

Rock model?

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From geophysics to a geologic model

Rock model from geophysics

Geologic model

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http://simpeg.xyz