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Abstract

A geophysical surveillance pilot was started to identify the best monitoring solution for field-scale deployment. The field is being developed using steam-injection EOR methods. Baseline surface seismic, 3DVSP and cross-well surveys have been acquired and processed. Surface seismic is very challenging in the area due to complex near-surface conditions, multiple contamination and weak target formation reflectivity. On the other hand, 3DVSP and cross-well surveys allow us to get clear images of the target reservoir after application of the experimental processing approaches. For cross-well data, the use of sources and receivers below the targets and down-going reflections delivered the image of the interval of interest, whereas there was almost no use in sources and receivers above the targets. This was not expected originally and highlighted the importance of considering ’illumination from below’ as an option in pre-survey modeling. The extensive multiple presence in the field impacted the 3DVSP images created with the use of space-domain Deconvolution of up-going signal with a filter derived from downgoing waves. In order to suppress multiples more efficiently, we developed and applied ’interferometric deconvolution’ in the wavenumber domain. This deconvolution approach led to a cleaner image of the target.

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/content/papers/10.3997/2214-4609.20145270
2011-01-16
2024-03-29
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20145270
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