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Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the delineation of complex geologic structures through Seismic Multi-attribute Realistic Co-visualizations (MRC) techniques. Ignacio Rovira Staff Geophycisist Pan American Energy

Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

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Page 1: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

Advanced Structural Interpretation

Multidimensional Analysis and Interpretation for the

delineation of complex geologic structures through Seismic

Multi-attribute Realistic Co-visualizations (MRC) techniques.

Ignacio Rovira Staff Geophycisist

Pan American Energy

Page 2: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

2© 2019 Halliburton. All rights reserved.

DISCLAIMER 2019

The contents of this presentation are for informational purposes only. Halliburton**

makes no representation or warranty about the accuracy or suitability of the

information provided in this presentation and any related materials. Nothing in this

presentation constitutes professional advice or consulting services. No contractual

relationship with Halliburton is established by attending or viewing this

presentation. No rights to intellectual property of Halliburton are granted through this

presentation. The opinions expressed in this presentation are those of the author

and do not necessarily represent the views of Halliburton. **Halliburton means

Halliburton Energy Services, Inc., Landmark Graphics Corporation, and their

affiliates.

Page 3: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

3© 2019 Halliburton. All rights reserved.

Challenges & Objectives

Identification of structural styles, recognition of main geological structures,

delineation of faults resulting from complex tectonic processes.

Introduce a workflow based in the combination of geometric seismic attributes and

automatic faults recognition tools.

Page 4: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

4© 2019 Halliburton. All rights reserved.

Multiple Realistic Covisualizations

The constructive co-visualization of two

or more seismic attributes that, together,

enhance certain geologic features which,

otherwise are very hard to identify and

interpret.

HDR Exposure Blending

What is MRC?

Page 5: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

5© 2019 Halliburton. All rights reserved.

Amplitude Seismic Section

This interpretation couldn’t be considered

wrong.

But, is it complete? How accurate is it?

Golfo San Jorge Basin, Patagonia, Argentina Modified from Sylwan (2001)

Page 6: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

6© 2019 Halliburton. All rights reserved.

Amplitude Trace

RMS Amplitude

with a specific

w window.

Hilbert’s

Transform

AVT Attribute Trace

What is AVT ?

» The step from the bi-dimensional vision to

the feeling of a realistic seismic section.

Meta-Attributes

Coherence

Curvature

Likelihood

Cosine of Phase

Instantaneous Phase

AVT Attribute Seismic Section

Page 7: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

7© 2019 Halliburton. All rights reserved.

» The MRC Section shows more detail for

this intensely faulted area.

» Using AVT as input, Fault Likelihood volumes were

calculated.

» We also computed the Cosine of Phase from the

SofS4 volume.

» And combined it with Tracking volume to generate

the MRC.

MRC Seismic Section

Page 8: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

8© 2019 Halliburton. All rights reserved.

» The increment in visible detail gives theinterpreter the possibility of re order the faultswarm and offer an alternative interpretation.

» This could also give more insight in themechanisms of development of the observedstructure.

» Therefore, give new clues about the petroleumsystem in that area.

MRC Seismic Section

Page 9: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

9© 2019 Halliburton. All rights reserved.

Discontinuity (AVT) attribute shows aheavily faulted area produced by thislarge faults indicated with blackpolygons.

As seen in the picture, this attribute byit self is not capable of giving a verydetailed response to this structuralstyle.

Discontinuity(AVT)

N

Page 10: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

10© 2019 Halliburton. All rights reserved.

3D block: Depth Slice Discontinuity + Fault Tracking (AVT)

+-

Regional Structural Trend

Oblique Structural Trend

N

N

Calculating Fault Likelihood attributes and running an Automatic Fault Recognition

process gave the first clues. So, a two direction fault system was proposed.

Discontinuity(AVT)

Page 11: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

11© 2019 Halliburton. All rights reserved.

N

» Aided by this type of MRC,

we were able to easier

interpret faults.

MRC Instantaneous Phase (SofS4(AVT)) + Fault Tracking (AVT) Section

N

Page 12: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

12© 2019 Halliburton. All rights reserved.

PLMS-

991

N N N

Top CTop BTop A

The identification of the structural style improved the interpretation and mapping process.

Faults and surfaces were identified and mapped with great detail using Framework.

A great insight in the evolution of the structure was gained.

Base Top

Page 13: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

13© 2019 Halliburton. All rights reserved.

Neuquina Basin,

Patagonia, Argentina

Argument:

» Faults don’t cut Vaca Muerta Formation.

Amplitude Seismic Section

Page 14: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

14© 2019 Halliburton. All rights reserved.

After calculating attributes and

generating the MRC, it becomes very

clear that faults cut Vaca Muerta Fm.

This could have great impact in the

generation of sweet spots with

drilling potential.

Is it possible to go beyond?

MRC Seismic Section

Page 15: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

15© 2019 Halliburton. All rights reserved.

Vaca Muerta Base Horizon Slice

Fault Tracking (AVT Full Stack)

Vaca Muerta Base Horizon Slice

Fault Tracking (AVT 12-24 degrees Angle Stack)

Page 16: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

16© 2019 Halliburton. All rights reserved.

Principal trends of faulting can be

spotted on Full Stack volumes, but…

On partial angle stacks, we could get

a clearer image on what could be

happening between main faults.

This should be matched with

microseismic and geomechanical

data.

Vaca Muerta Base Horizon Slice

Fault Tracking (AVT 12-24 degrees Angle Stack)

Page 17: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

17© 2019 Halliburton. All rights reserved.

Conclusions

MRC techniques proved to be a very helpful tool to interpret heavily faulted areas.

The combination of attributes and meta-attributes impacts positively in gaining new

geological insight.

This improvement in visualization resulted in maximizes the added value of seismic data

and the interpreter´s work.

Page 18: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

18© 2019 Halliburton. All rights reserved.

Challenge»Structural style identification.

»Recognition of main geological structures.

»Delineation of faults resulting from complex tectonic processes.

Solutions»Calculate attributes and meta-attirbutes.

»Use Oriented filters and Automatic Fault Recognition Tools (Likelihood).

»Generate MRC (Multiple Realistic Covisualizations).

Results»Improvements in visualization, recognition and intepretation.

»Increment of the added value of seismic interpretation.

Summary

Page 19: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

19© 2019 Halliburton. All rights reserved.

Thank You

Page 20: Advanced Structural Interpretation · Advanced Structural Interpretation Multidimensional Analysis and Interpretation for the ... The identification of the structural style improved

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