1 / 20

Cooper Basin 3D reprocessing Verona 3D

Cooper Basin 3D reprocessing Verona 3D. Processing flow summary. Reformat from SEG-D and add geometry Noise attenuation 3D refraction statics Surface consistent residual statics

upton
Télécharger la présentation

Cooper Basin 3D reprocessing Verona 3D

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cooper Basin 3D reprocessing Verona 3D

  2. Processing flow summary Reformat from SEG-D and add geometry Noise attenuation 3D refraction statics Surface consistent residual statics Fourth order NMO corrections applied to account for differences between vertical and horizontal velocity Pre-stack time migration (using AusGeos Proprietary EOM processing) with geometry-linked migration aperture to reduce noise Migrated to 25m x 25m output grid High density velocity analysis for sharper imaging (25m x 25m / every trace) Spectral balancing, filter and scaling tailored to acquisition parameters

  3. Comparison with Kirchhoff PSTM

  4. AusGeos EOM processing Same velocity field

  5. AusGeos Processing Results • Seismic data with excellent horizontal and vertical resolution • Faults are sharper and better defined • Final result has good signal to noise making it possible to produce a more reliable interpretation in less time • Improved quality means auto-tracking works better - allowing user to converge on a quality interpretation in less time • Interpretation-ready (SEG Y format) delivered

  6. Preliminary observations - Interpretation Cadna-owie, Namur and Birkhead can be auto tracked with minimal editing required. Channel features in the Birkhead – Hutton are visible on amplitudes extracted from EOM-processed data on horizon slices Interpretation of the Toolachee shows depositional lobes with basement controlled fault terraces controlling their distribution Permian deposition is fault-controlled on a less regional scale, but at the reservoir scale discontinuities are dominantly stratigraphic. Preliminary interpretation shows that it should be possible to define reservoir continuity within the Permian using EOM processing Analysis of the existing data shows • Kirchhoff migration artefacts, low signal to noise combined with unrealistic spectral whitening has resulted in signal break-up up which could be misinterpreted as faulting

  7. Inline – across Verona - existing data West East Poolowanna Toolachee Murteree Patchawarra Major bounding fault – controlling Deposition of Patchawarra Formation

  8. Inline – across Verona – EOM processing West East Poolowanna Toolachee Murteree Patchawarra Major bounding fault – controlling deposition of Permian Formations Lower Permian thickening into fault

  9. Inline AusGeos EOM processing Cadna-owie Namur Channel Hutton Poolowanna Toolachee

  10. Inline – Existing seismic data Cadna-owie Namur Channel Hutton Poolowanna Toolachee

  11. Time slice 2300ms (within Patchawarra) Major bounding fault – controlling deposition of Permian Formations

  12. Time slice 2300ms EOM Major bounding fault – controlling deposition of Permian Formations

  13. Time slice 1800ms (near Hutton) – existing data Channel

  14. Time slice 1800ms (near Hutton) – EOM data Channel

  15. Two Way time – Cadna-owie (existing data) Data auto tracked from many seed points and edited

  16. Two Way time – Cadna-owie (EOM data) Data auto tracked from 2 seed points

  17. Two way time to Cadna-owie (3D view)

  18. Horizon slice showing channel in Birkhead Hutton interval Channel

  19. Hutton channels from spectral decomposition

  20. Summary Verona 3D selected to highlight improvements in data quality possible using latest EOM processing Showcases results of AusGeos detailed seismic processing capability Fully processed final volume is available for purchase (data on USB disk) Processing time for similar sized 3D surveys is between 6 and 8 weeks Costs approximately $600/sq km Contact: www.AusGeos.com.au Peter@ausgeos.com.au

More Related