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High-Resolution Reservoir Monitoring Using Crosswell Seismic

Authors
Ajay Nalonnil (Schlumberger) | Bruce Marion (Schlumberger)
DOI
https://doi.org/10.2118/132491-PA
Document ID
SPE-132491-PA
Publisher
Society of Petroleum Engineers
Source
SPE Reservoir Evaluation & Engineering
Volume
15
Issue
01
Publication Date
February 2012
Document Type
Journal Paper
Pages
25 - 30
Language
English
ISSN
1094-6470
Copyright
2012. Society of Petroleum Engineers
Disciplines
4.1.5 Processing Equipment, 5.6.6 Cross-well Tomography, 4.3.4 Scale, 3.3 Well & Reservoir Surveillance and Monitoring, 4.1.2 Separation and Treating
Keywords
crosswell tomography
Downloads
1 in the last 30 days
689 since 2007
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SPE Non-Member Price: USD 35.00

Summary

Crosswell seismic is an emerging technology that provides highly detailed images of the subsurface at the reservoir scale. The technology has the potential not only to delineate complex structures, but also to monitor the effectiveness of hydrocarbon-recovery and CO2-sequestration strategies. The technique employs tomographic surveying, whereby a transmitter and receiver are deployed in separate wells. With this setup, interwell velocity profiling and structure can be obtained from direct-wave and reflection processing, respectively.

With increased hydrocarbon recovery and CO2 sequestration becoming more prominent in the oil and gas industry, the ability to monitor the efficiency of these strategies is paramount. In this paper, two case studies of crosswell seismic surveying are discussed, with the focus on high-resolution imaging and monitoring during CO2 injection for improved oil recovery. A brief description of the measurement theory and its capabilities is provided, followed by a description of the processing workflow and, finally, a discussion of the acquired results.

The two cases discussed demonstrate that crosswell seismic was able to successfully monitor the injection through velocity profiling in time lapse and provide answers as to why and how the flow has occurred through interpretation of the crosswell reflection seismic section. The results clearly show that crosswell seismic could significantly reduce the uncertainty and risk associated with injection processes for improved recovery and can extend the technique to sequestration monitoring.

File Size  1 MBNumber of Pages   6

References

Bryans, B., Carillo, P. and Verduzco, B. 2009. Crosswell Seismic, A DeepLook Into CO2 Injection and Sequestration Monitoring. Presented atthe 11th International Congress of the Brazilian Geophysical Society, Salvador,Brazil, 24-28 August.

Lazaratos, S.K. and Marion, B.P. 1997. Crosswell seismic imaging ofreservoir changes caused by CO2 injection. The Leading Edge 16 (9): 1300-1308. http://dx.doi.org/10.1190/1.1437788.

Wang, Z., Cates, M.E., and Langan, R.T. 1998. Seismic monitoring of aCO2 flood in a carbonate reservoir: A rock physics study.Geophysics  63 (5): 1604-1617. http://dx.doi.org/10.1190/1.1444457.

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