Toward affordable permanent seismic reservoir monitoring using the sparse OBC concept

Smit, Frans; Ligtendag, Maarten; Wills, P.; Calvert, Rodney

doi:10.1190/1.2193219

Cited by 5 publications

(3 citation statements)

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“…(b) Short time window around three traces that have been extracted from five repeat shots at the same location from different source vessel passes. The intragroup variations (same shot and receiver positions) are much smaller than between the three groups (different receiver positions) (fromSmit et al, 2006).…”

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confidence: 96%

3D Seismic Survey Design, Second edition

Vermeer¹

2012

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confidence: 96%

3D Seismic Survey Design, Second edition

Vermeer¹

2012

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“…For permanent arrays to be a cost-effective monitoring option, emphasis must be placed on selecting the sparsest (and hence least expensive) possible source/receiver geometry capable of producing images of a given quality. Smit et al (2006) cogently presents this philosophy within the context of ocean bottom cable installations. While the cost of a given geometry is relatively simple to evaluate, the "quality" of the resulting experiment is more difficult to quantify since it depends not only on our ability to resolve individual geologic features but also on the monitoring questions we are attempting to answer.…”

Section: Introductionmentioning

confidence: 99%

“…Increasingly, permanent sensor arrays in boreholes (Blanco et al, 2006;Daley et al, 2007b) and on the ocean floor (Smit et al, 2006;Thompson et al, 2006) are being deployed to improve the repeatability of monitoring surveys by eliminating the need to re-position receivers. By allowing continuous monitoring, permanently deployed sensor arrays also have the potential to improve the temporal resolution of geophysical measurements by an order of magnitude (or more); this increase in temporal sampling will in turn allow scientists to probe transient subsurface processes with shorter time scales, invisible to the currently available 4D seismic monitoring methods that typically sample on the scale of months or even years.…”

Section: Introductionmentioning

confidence: 99%

Optimal experiment design for time-lapse traveltime tomography

Ajo‐Franklin

2009

GEOPHYSICS

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Geophysical monitoring techniques offer the only noninvasive approach capable of assessing both the spatial and temporal dynamics of subsurface fluid processes. Increasingly, permanent sensor arrays in boreholes and on the ocean floor are being deployed to improve the repeatability and increase the temporal sampling of monitoring surveys. Because permanent arrays require a large up-front capital investment and are difficult (or impossible) to re-configure once installed, a premium is placed on selecting a geometry capable of imaging the desired target at minimum cost. We present a simple approach to optimizing downhole sensor configurations for monitoring experiments making 1 use of differential seismic traveltimes. In our case, we use a design quality metric based on the accuracy of tomographic reconstructions for a suite of imaging targets. By not requiring an explicit singular value decomposition of the forward operator, evaluation of this objective function scales to problems with a large number of unknowns. We also restrict the design problem by recasting the array geometry into a low dimensional form more suitable for optimization at a reasonable computational cost. We test two search algorithms on the design problem: the Nelder-Mead downhill simplex method and the Multilevel Coordinate Search algorithm. The algorithm is tested for four crosswell acquisition scenarios relevant to continuous seismic monitoring, a two parameter array optimization, several scenarios involving four parameter length/offset optimizations, and a comparison of optimal multi-source designs. In the last case, we also examine trade-offs between source sparsity and the quality of tomographic reconstructions. One general observation is that asymmetric array lengths improve localized image quality in crosswell experiments with a small number of sources and a large number of receivers. Preliminary results also suggest that highquality differential images can be generated using only a small number of optimally positioned sources.2

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2012

3D Seismic Survey Design, Second Edition

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Toward affordable permanent seismic reservoir monitoring using the sparse OBC concept

Cited by 5 publications

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3D Seismic Survey Design, Second edition

3D Seismic Survey Design, Second edition

Optimal experiment design for time-lapse traveltime tomography

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