prestack waveform inversion an onshore application in the us gulf coast
Download
Skip this Video
Download Presentation
Prestack Waveform Inversion: an Onshore Application in the US Gulf Coast

Loading in 2 Seconds...

play fullscreen
1 / 19

Prestack Waveform Inversion: an Onshore Application in the US Gulf Coast - PowerPoint PPT Presentation


  • 86 Views
  • Uploaded on

Prestack Waveform Inversion: an Onshore Application in the US Gulf Coast. August Lau, Chuan Yin, Mike Greenspoon, Apache Corp; Anthony Vassiliou, GeoEnergy September 2007. Well to Seismic Tie.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Prestack Waveform Inversion: an Onshore Application in the US Gulf Coast' - aurora-mills


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
prestack waveform inversion an onshore application in the us gulf coast

Prestack Waveform Inversion: an Onshore Application in the US Gulf Coast

August Lau, Chuan Yin, Mike Greenspoon, Apache Corp; Anthony Vassiliou, GeoEnergy

September 2007

well to seismic tie
Well to Seismic Tie

Well-to-seismic tie: zero-offset synthetic and PSTM final stack. Displayed panels are (L to R): gamma-ray log, resistivity log, sonic log, bulk density log, full-stack overlaid with zero-offset synthetic, cross-correlation of the synthetic to surface seismic.

slide4
Pay sand has lower Vp / Vs and P- imp

Pre-Stack Rock Properties

Sand with Pay has Lower Vp / Vs Ratio and Lower P-impedance

slide7
Vp

InitialFinal

Vs

InitialFinal

Density

InitialFinal

Starting and Final Models

applications of pre stack inversion
Applications of Pre-Stack Inversion
  • Estimation of Vp, Vs, density, Zp, Zs and their uncertainties for fluid and lithology discrimination
  • Through calibration and interpretation, thickness estimation, net to gross estimation, porosity estimation
  • Interpretation of small-scale or localized features, such as narrow channels, slump faults, etc.
full stack amplitude extraction
Well F

Well 3

Well A

2000’

Well B

Well D

Well C

Well E

ARB LINE

Full Stack Amplitude Extraction
full stack
Full Stack

Main Producing Field

Cross Section

WELL F

WELL A

WELL B

WELL C

WELL E

Horizon A

Horizon B

5 20 angle stack
5-20 Angle Stack

Main Producing Field

Cross Section

WELL F

WELL A

WELL B

WELL C

WELL E

Horizon A

Horizon B

arbitrary line interpreted lithology cube
Arbitrary Line-Interpreted Lithology Cube

Main Producing Field

Cross Section

WELL F

WELL A

WELL B

WELL C

WELL E

Horizon A

Horizon B

vp vs volume
Well F

Well 3

Well A

2000’

Well B

Well D

Well C

Well E

ARB LINE

Vp/Vs Volume
slide14
Well F

Well 3

Well A

2000’

Well B

Well D

Well C

Well E

ARB LINE

DZP
slide15
Well F

Well 3

Well A

2000’

Well B

Well D

Well C

Well E

ARB LINE

DZS
slide16
Inversion Technique DifferencesMajor Differences between Pre-stack Waveform Inversion applied to gathers and angle-stack inversions:
  • Pre-stack waveform inversion is applied directly on gathers with NMO removed, preserving all amplitude, phase, offset information
  • Pre-stack waveform inversion is seismic data driven. Angle stack inversion commonly well log driven
  • Assuming long enough acquisition cable, pre-stack waveform inversion estimates directly Vp, Vs, density
slide17
Inversion Technique Differences con’t.
  • Pre-stack waveform inversion can work with either only primary reflections or with both primary and multiple reflections
  • Pre-stack waveform inversion applied directly on gathers does not have to deal with the NMO stretch effect for long cables
  • Pre-stack waveform inversion makes use of interval velocities.
  • Pre-stack waveform inversion applied on gathers is not sensitive to starting low frequency Vp / Vs / density model
conclusions
Conclusions
  • Pre Stack Inversion is a faster, cheaper, and more accurate method than traditional well-based inversion techniques
  • Various output volumes can be calibrated with well control for net pay estimations
  • Prospects can be qualified with multi-cube interpretation
  • A detailed geologic input model is not necessary to produce results
acknowledgements
Acknowledgements
  • Seismic Data Courtesy of Seitel
ad