1887
ASEG2001 - 15th Geophysical Conference
  • ISSN: 2202-0586
  • E-ISSN:

Abstract

A comparison between acousto-elastic modeling, surface seismic, and wireline responses to overpressure suggests that acoustic responses to overpressure are not uniform among the data of different sources. Acousto-elastic modeling underestimates the effect of the in-situ formation pressures on acoustic properties of waves. That seismic energy decreases with increasing pore pressure is evident for either very low overpressure or extremely high overpressure, but becomes less definite for moderate overpressure. Sonic logs in conjunction with wireline pressure measurements in a number of wells are used to establish a common understanding of acoustic-pressure relationship in the Muderong Shale of the northern Carnarvon Basin. The velocity-pressure relationship in the Muderong Shale seems to be controlled by stratigraphic factors. In the same stratigraphic category, acoustic velocity changes across wells are found to be consistent with pore-pressure variations in our examples. Investigation of velocity-pressure relationships for the Muderong Shale indicates that pore-pressure prediction should be based on the detailed lithologic classification.

© ASEG 2001
Loading

Article metrics loading...

/content/journals/10.1071/ASEG2001ab043
2001-12-01
2026-01-12

  • From This Site

    /content/journals/10.1071/ASEG2001ab043
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Badri, M. A., Sayers, C. M., Awad, R., and Graziano, A., 2000, A feasibility study for pore-pressure prediction using seismic velocities in the offshore Nile Delta, Egypt. The Leading Edge, October, 1103-1108.
  2. Dewhurst, D., and Siggins, A., 2000, The ultrasonic response of Pierre Shale to isotropic compaction and unloading under controlled stress and pore pressure conditions. APCRC Confidential Report, Number 00-003.
  3. Fu, L-Y., Dodds, K., and Wang X., 2000, Integrating geological, logging, and seismic information for pore pressure prediction. 2000 AAPG International Conference & Exhibition, Bali, Indonesia.
  4. Johnson, G. C, 1981, Acoustoelastic theory for elastic-plastic materials, J. Acoust. Soc. Am. 70, 591-595.
  5. Otto, C, Yassir, N., Hennig, A., Underschultz, J., 2000, Pressure systems on the NW shelf of Australia - a comprehensive hydrodynamic database. Overpressure 2000 Workshop, London, UK.
  6. Siggins, A., and Dewhurst, D., 2000, Elastic properties of shales at ultrasonic frequencies and their relationship to microstructure. APCRC Confidential Report, Number 00-003.
  7. Sinha, B. K. and Liu, Q. H., 1995, Flexural waves in pressurized boreholes: A finite-difference approach: 65 Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 26-29.
  8. Swarbrick, R. E., and Hillis, R. R., 1999, The origin and influence of overpressure with reference to the North West Shelf, Australia. APPEA JOURNAL, 64-72.
  9. Wang X., Dodds, K., and Fu, L-Y., 2000, Elastic wave propagation in the pre-stressed formation with a borehole. 2000 AAPG International Conference & Exhibition, Bali, Indonesia.
  10. WAPET, 2000, WA-25-P pore pressure prediction report, Compiled by William Abriel and Matthew Johnson, Chevron Australia Pty Limited.
/content/journals/10.1071/ASEG2001ab043
Loading
  • Article Type: Research Article
Keyword(s): Acoustic property; acoustoelastic modeling; overpressure; pore pressure; seismic amplitude; sonic logging

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