Feasibility study of time‐lapse seismic monitoring for heavy oil reservoir development — The rock‐physical basis

Theune, Ulrich; Schmitt, Douglas R.; Rokosh, Dean

doi:10.1190/1.1844071

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…Production logging in this well confirmed the interpretation that after two years of steam injection, the full length of the horizontal well had been heated. Theune et al (2003) and Theune (2004) modeled the anticipated seismic responses due to steam injection into this reservoir that incorporated fluid substitution of steam and water for bitumen under expected in situ conditions. Because the Senlac reservoir is relatively thin (approximately 10 m), it was suggested that seismic monitoring of the reservoir would be difficult because traveltime attributes were not observable.…”

Section: Steam Flood Monitoringmentioning

confidence: 99%

1. Heavy-Oil Reservoirs: Their Characterization and Production

Chopra¹,

Lines²,

Schmitt³

et al. 2010

Heavy Oils

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Section: Steam Flood Monitoringmentioning

confidence: 99%

1. Heavy-Oil Reservoirs: Their Characterization and Production

Chopra¹,

Lines²,

Schmitt³

et al. 2010

Heavy Oils

Self Cite

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Crosswell monitoring using virtual sources and horizontal wells

Byun

Seol

2010

GEOPHYSICS

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Time-lapse crosswell seismic provides an efficient way to monitor the migration of a CO 2 plume or its leakage after CO 2 injection into a geologic formation. Recently, crosswell seismic has become a powerful tool for monitoring underground variations, using the concept of a virtual source, with virtual sources positioned at the receivers installed in the well and thus the positions of sources and receivers can be invariant during monitoring. However, time-lapse crosswell seismic using vertical wells and virtual sources has difficulty in describing the front of a CO 2 plume, which usually is parallel to the vertical wells, and in obtaining sufficient ray coverage for the first-arrival tomography. These problems arise because of the theoretical downward-illumination-directivity limitation of the virtual source. We have developed an effective monitoring method that uses virtual sources and two horizontal wells: one above and one below the CO 2 sequestration reservoir. In our method, we redatum the traces that are recorded at geophones in horizontal wells from sources on the surface. The redatumed traces then become virtual traces recorded at geophones in the lower well and sent from virtual sources at the positions of the geophones in the upper well. The geometry of our method has advantages for locating the front of the CO 2 plume, which is normal to the horizontal wells, compared with either real or virtual sources. The method also is advantageous in acquiring full ray coverage between the wells, and that coverage is superior to coverage acquired using vertical crosswell seismic with virtual sources. In addition, we can avoid problems related to any potential change in the medium above the reservoir and in the source and receiver positions. The results of applying our method to synthetic data that simulate CO 2 -sequestration monitoring show that the front of a CO 2 plume in the reservoir is depicted accurately in a velocity tomogram. The new method also can be used to monitor a reservoir during production of heavy oil.

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Feasibility study of time‐lapse seismic monitoring for heavy oil reservoir development — The rock‐physical basis

Cited by 2 publications

References 5 publications

1. Heavy-Oil Reservoirs: Their Characterization and Production

1. Heavy-Oil Reservoirs: Their Characterization and Production

Crosswell monitoring using virtual sources and horizontal wells

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