4D Seismic over the Pyrenees Fields

Guy Duncan; James Cai; Kon Kostas; Tom Perrett; Mauricio Florez; James Stewart; Stas Kuzmin

doi:10.1071/ASEG2015ab150

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa 4D Seismic over the Pyrenees Fields
Authors Guy Duncan^a, James Cai^b, Kon Kostas^c, Tom Perrett^d, Mauricio Florez^e, James Stewart^f and Stas Kuzmin^g
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^a BHP Billiton 125 St Georges Tce, Perth, [email protected] ^b BHP Billiton 1360 Post Oak Blvd, Houston, [email protected] ^c BHP Billiton 125 St Georges Tce, Perth, [email protected] ^d BHP Billiton 125 St Georges Tce, Perth, [email protected] ^e BHP Billiton 1360 Post Oak Blvd, Houston, [email protected] ^f BHP Billiton 125 St Georges Tce, Perth, [email protected] ^g BHP Billiton 1360 Post Oak Blvd, Houston, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2015ab150
- Published online: 01 Dec 2015

Abstract

In this paper we present a case study of 4D seismic acquired over the Pyrenees Fields, offshore Western Australia. The Pyrenees trend was discovered with the drilling of the West Muiron-5 discovery well in 1993 which found oil and gas within the Pyrenees member sandstones. Production at Pyrenees started in 2010.

Before the start of production, a dedicated 4D baseline survey was recorded over the fields in 2006. A detailed modelling study concluded that a 4D monitor survey would provide useful information for reservoir surveillance and infill drilling decisions. The monitor survey was acquired in 2013, and the overall quality of the 4D was excellent with high 4D signal strength and low 4D noise.

The 4D response at Pyrenees is broadly consistent with the modelling. The main response is softening of the reservoir caused by gas coming out of solution produced by a pressure drop within the reservoir. The 4D response to changes in oil saturation is small. Incorporating the 4D interpretation into field development is ongoing, and so far it has been useful for refining the stratigraphic model, determining fault seal integrity, and determining the sealing capacity of intra-field faults.

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References

Cai, J., Kostas, K., Tomich, K., Duncan, G., and Whitney, S., 2014, Well calibrated time-domain azimuthal anisotropy correction: accepted for presentation at 84th SEG Annual Meeting, Denver, Expanded Abstracts.
Corrigan, D., Withers, R., Darnall, J., and Skopinski, T., 1996, Fracture mapping from azimuthal velocity analysis using 3-D surface seismic data: 66th SEG Annual Meeting, Expanded Abstracts, 1834-1837.
Day, A., Widmaier, M., Hoy, T., and Osnes, B., 2010, Time-lapse acqusition with a dual-sensor streamer over a conventional baseline survey: First Break, 28, 79-87.
Sando, I., 2012, The latest Sleipner CO2 injection monitoring using dual sensor steamer technology: 74th EAGE Conference and Exhibition, Copenhagen, Denmark, Extended Abstracts.
Scibiorski, J.P., Micenko, M., and Lockhart, D., 2005, Recent discoveries in the Pyrenees Member, Exmouth Sub-basin: a new oil play fairway: APPEA Journal, 233-251.
Woodall, M., and Stark, C., 2013, The Stratigraphy of the Pyrenees Member of the Ravensworth, Crosby and Stickle Fields, Exmouth Sub-basin, Northwest Australia: A wave- and storm-dominated shelf-margin delta: Proceedings of the Petroleum Exploration Society of Australia Symposium, Perth, WA, 2013.
Woodward, J.M., Stanley, M., and Duncan, G., 2006, Design and acquisition of a 4D base survey: a case study from the Pyrenees oil development, Exmouth Sub-basin, Western Australia: AAPG International Conference & Exhibition, Perth, Australia.

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Article Type: Research Article

Keyword(s): 4D; acquisition; interpretation; processing; Pyrenees; time lapse

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