1887
  1. Home
  2. Conferences
  3. Conference Proceedings
  4. 77th EAGE Conference and Exhibition - Workshops
  5. Conference paper

Abstract

Summary

Production from oil and gas fields induces velocity changes and strains in the subsurface, which create time shifts between vintages of time-lapse seismic data. Recovering these time shifts can be useful for reservoir management, particularly through calibration of geomechanical models. and have shown that these shifts can be estimated using non-linear inversion of poststack time-lapse seismic. These existing inversions of post-stack data assume that the seismic ray paths in all vintages are vertical. However, examining pre-stack time-lapse data shows that the recorded time shifts are offset dependent. To estimate the true subsurface changes we must invert pre-stack time-lapse seismic, which requires more accurate modelling of the seismic energy propagation. This abstract introduces a new tomographic inversion of pre-stack time-lapse seismic which aims at estimating the velocity changes that explain all pre-stack time shifts. We retain the assumption of the existing post-stack methods that the ray paths do not change between vintages, but discard the assumption that they are vertical. This allows a linear tomography system to be set up and solved for velocity change. We test this method on synthetic data and compare the results with an existing post-stack approach.

© EAGE Publications BV
Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201413456
2015-06-01
2024-04-16

  • From This Site

    /content/papers/10.3997/2214-4609.201413456
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Edgar, J.A. and Blanchard, T,D.
    , 2015a, Using Plane Wave Destruction Filters to Invert for Time-lapse Time Shifts and Time Strain, 77th Conference and Exhibition, EAGE, Extended Abstracts.
     [Google Scholar]
  2. , 2015b, Imposing Geological and Geomechanical Constraints on Time-lapse Time Strain Inversion, 77th Conference and Exhibition, EAGE, Extended Abstracts.
     [Google Scholar]
  3. Fomel, S.
    , 2002, Applications of plane-wave destruction filters, Geophysics, v. 67.
     [Google Scholar]
  4. Fuck, R.F., Bakulin, A. and Tsvankin, I.
    , 2009, Theory of traveltime shifts around compacting reservoirs: 3D solutions for heterogeneous anisotropic media, Geophysics, v. 74D25–D36.
     [Google Scholar]
  5. Herwanger, J.V. and Horne, S.A.
    , 2009, Linking reservoir geomechanics and time-lapse seismic: Predicting anisotropic velocity changes and seismic attributes, Geophysics, v. 74W13–W33.
     [Google Scholar]
  6. Landro, M. and Stammeijer, J.
    , 2004, Quantitative estimation of compaction and velocity changes using time-lapse impedance and traveltime changes, Geophysics, v. 69949–957.
     [Google Scholar]
  7. Rickett, J., Duranti, L., Hudson, T., Regel, B. and Hodgson, N.
    , 2007, 4D time strain and the seismic signature of the geomechanical compaction at Genesis, The Leading Edge, 644–647.
     [Google Scholar]
  8. Roste, T., Stovas, A. and Landro, M.
    , 2006, Estimation of layer thickness and velocity changes using time-lapse prestack seismic data, Geophysics, v. 71S219–S234.
     [Google Scholar]
  9. Vesnaver, A.L., Accaino, F., Bohm, G., Madrussani, G., Pajchel, J., Rossi, G. and Dal Moro, G.
    , 2003, Time-lapse tomography, Geophysics, v. 68815–823.
     [Google Scholar]
  10. Williamson, P.R., Cherrett, A.J. and Sexton, P.A.
    , 2007, A new approach to warping for quantitative time-lapse characterisation, 70th Conference and Exhibition, EAGE, Extended Abstracts.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201413456
Loading
Estimating Overburden Velocity Changes from Pre-stack Time Shifts Using Linear Tomography
Conference Proceedings 2015, 1 (2015); https://doi.org/10.3997/2214-4609.201413456
/content/papers/10.3997/2214-4609.201413456
/content/papers/10.3997/2214-4609.201413456
Loading

Data & Media loading...

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error