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O. Ovcharenko, J. Akram, D. Peter
March 6, 2018
Feasibility of moment tensor inversion for a single-well
microseismic data using neural networks
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Outline
Single-well data
Artificial Neural Network
Example in a homogeneous model
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Idea
Reconstruct source mechanisms from single-well data using an artificial neural network
https://www.geoexpro.com/articles/2017/07/
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANNhttp://www.halliburton.com/en-US/ps/pinnacle/microseismic-monitoring/
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Source mechanism
P S
“Beach ball”
http://demonstrations.wolfram.com/author.html?author=Frank+Scherbaum%2C+Nicolas+Kuehn%2C+and+Bj%C3%B6rn+Zimmermann
Radiation 

patterns
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Source mechanism
P S
6 independent components
Seismic moment tensor
(Stein & Wysession, 2003)
Radiation 

patterns
“Beach ball”
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Source mechanism
P S
6 independent components
Seismic moment tensor
(Stein & Wysession, 2003)
Radiation 

patterns
“Beach ball”
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Source mechanism
P S
6 independent components
Seismic moment tensor
(Stein & Wysession, 2003)
Radiation 

patterns
“Beach ball”
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
(Rebetsky et al., 2018 in preparation)
Stress state
Seismic hazard assessment
Estimates of fracturing direction
Better reservoir characterization
Used for
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Microseismic acquisition design
SurfaceBorehole
(Leo Eisner, MicroSeismic Inc.)
(Geometrics Inc.)
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Multi-well borehole acquisition
(Vavryčuk, 2007)
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Single-well borehole acquisition
(Vavryčuk, 2007)
Up to 5 moment tensor
components could be resolved
with conventional P+S arrival
inversions
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Can we retrieve the full moment tensor from a single-well acquisition
using an artificial neural network?
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Single-well data
Artificial Neural Network
Example in a homogeneous model
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Machine Learning
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Neural Networks pros and cons
- Lots of parameters

- Hard to interpret

- Computational costs
+ Good for nonlinear problems

+ Good for large inputs

+ Data-driven
+ Easy to implement and parallelize

+ Ability to generalize
Not a magic wand, use with care
Pros Cons
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Neural network architecture
Input Hidden OutputLayers:
Neuron
Bias
Weight
Training 

=

tuning up weights
w
b
w + =
W x b
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Training
Training inputs Training outputs
Minimize L2 norm
Neural networks require training with multiple inputs
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Data generation
https://www.geoexpro.com/articles/2017/07/
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Input data
Px Py Pz Sx Sy Sz Px Py Pz Sx Sy Sz
First receiver Last receiver
3-component receivers

2 types of waves (P and S)

3 x 2 x NREC
Maximum amplitudes of P and S waveforms multiplied by their first arrival polarity
+Pz
+Sz
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Output data
Mxx Myy Mzz Myz Mxz Mxy
6 components of moment tensor describing source mechanism
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Single pair of training data
INPUT
OUTPUT
6 components of 

moment tensor
P
S
INPUT
OUTPUT
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Single-well data
Artificial Neural Network
Example in a homogeneous model
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Homogeneous medium
N = 8000 events
M = -3 … 0
Synthetic data
Mostly shear mechanisms
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Before
After
INPUTS OUTPUTS
Features Features
Data normalization
Train
Test
Important stage
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Computational facts
8000
300 6
NN: 5 hidden layers

Batch size: 200

Learning rate: 0.005

Optimizer: Adam

Weight regularization: 0.005
ObspyTensorFlow 1.3.0Python 3.6 Keras 2.0.5Matlab R2016b
Initialization “xavier”

(Glorot & Bengio, 2010)
Training time ~ 5 min

Prediction time < 1 sec
Training data generation
~ 2 min on 24 cores
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Detected focal mechanisms
Neural network never
seen these data before
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Detected focal mechanisms
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Analysis
Test data 1600 events
1294 DC
306 DC + ISO
17% moment tensors matched with 10% tolerance

80% eigenvalues matched with 5% tolerance
Std 12O
Deviation between detected and true P and T axes
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Conclusions
• Used a neural network to extract radiation pattern from a single-well data

• Able to retrieve full moment tensor

• Difficult to match absolute values

• Promising match of eigenvalues and eigenvectors
Future work
• Quantitative comparison

• Seismic moment

• Realistic cases
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Acknowledgements
We are grateful to Leo Eisner, SMI and SWAG groups at KAUST for
fruitful discussions.
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Conclusions
• Used a neural network to extract radiation pattern from a single-well data

• Able to retrieve full moment tensor

• Difficult to match absolute values

• Promising match of eigenvalues and eigenvectors
Future work
• Quantitative comparison

• Seismic moment

• Realistic cases
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
The End
Automated fault detection
(Araya-Polo et al., 2017)
Salt body picking
(Guillen et al., 2017)
Mapping reservoirs on
migrated seismic
(Bougher, 2016)
Facies classification
and reservoir properties prediction
(Hall, 2017; Ahmed et al., 2010)
Event detection
(Akram et al., 2017)
Interpolation of missing data
(Jia and Ma, 2017)
Denoising
(Zhang et al, 2017)
Some NN applications in geophysics
Inversion of seismic, DC data etc.
(Röth, Tarantola, 1994;
Neyamadpour et al., 2009)
oleg.ovcharenko@kaust.edu.saFeasibility of moment tensor inversion using ANN
Bonus

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