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1-16 of 16
Keywords: timeshift
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Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 27–September 1, 2023
Paper Number: SEG-2023-3910015
... We perform a semi-quantitative analysis of the amount of rebound of a reservoir initially depleted, exploiting some rather unique 4D seismic observations of “conventional” and “inverse” timeshifts at two sister wells, each producing from (almost) isolated compartments in the same reservoir. We...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3583439
... by the reservoir changes we wish to monitor. frequencies, while Slang et al. (2019) applied it to denoising We validate the method on synthetic time-lapse zero-offset and deblending. For time-lapse processing, Alali et al. data and show improvements in repeatability. We also (2020a) corrected for timeshifts...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3423186
... We introduce an approach to estimate timeshifts and reservoir property changes in time-lapse seismic data using machine learning (ML). ML models were trained for each reservoir field of interest by generating synthetic seismic data using 4D reservoir and geomechanical models. We then apply...
Proceedings Papers
Automatic gather flattening for AVO analysis using amplitude-adjusted plane-wave destruction filters
Publisher: Society of Exploration Geophysicists
Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17495535
... particularly effective for detecting small timeshifts between seismic traces. Separating estimation of timeshifts and amplitude variations allows residual non-hyperbolic moveout to be measured more accurately in the presense of AVO (amplitude variation with offset). The effectiveness of this algorithm...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2017 SEG International Exposition and Annual Meeting, September 24–29, 2017
Paper Number: SEG-2017-17495603
... ABSTRACT Time-lapse timeshifts are difficult to measure from seismic data in the presense of low frequencies or thin beds causing tuning effects. We propose to decompose time-lapse seismic images into discrete frequency components using the local time-frequency transform before estimating...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-1394
..., very near the surface, the wavelets add together. Such interference from the ghost can cause strong near-surface variations in the measured timeshifts, which is undesirable. Figure 1 Downhole fibre optic DAS refraction data recorded at Peace River Pad 19. The right part of the seismogram shows deep...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-0841
... Summary Time-lapse pressure saturation discrimination is performed for the CO 2 injection on the Snøhvit field. Thresholds for degree of fluid patchiness and Mindlin`s exponent are found from the rock physics input. The estimated pressure and saturation changes are used to estimate timeshift...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-4124
... ABSTRACT By studying refraction timeshifts associated with an old underground blowout, we find consistent timeshifts of up to 4 ms when comparing base and monitor surveys that were acquired before and some months after the underground blow out. The timeshifts are estimated by a standard...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-4160
... variability dataset reservoir characterization cantillo acquisition timeshift upstream oil & gas investigation time-lapse repeatability A quantitative discussion on time-lapse repeatability and its metrics Juan Cantillo*, Total E&P Summary Since Kragh and Christie's 2002 seminal paper...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-0061
... is the remarkable meaning and complementarity of these new variables. The RMS ratio is insensitive to timeshift, but it captures all amplitude effects. The correlation coefficient is also the zero-lag value of the normalized cross-correlation xab of the two traces: it is therefore completely insensitive to scaling...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-3810
... positions between the baseline and monitor surveys. Time-lapse amplitude hardening and time-lapse timeshifts as large as 6ms are observed after production primarily through pressure depletion. Besides the overall understanding of the subsurface as a result of the 4D survey, specific business decisions have...
Proceedings Papers
Keith Hawkins, Sharon Howe, Steve Hollingworth, Graham Conroy, Lotfi Ben-Brahim, Claire Tindle, Neville Taylor, Gregory Joffroy, Atef Onaisi
Publisher: Society of Exploration Geophysicists
Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2862
... ABSTRACT This paper is a geomechanics case study in which timelapse timeshifts have been accurately measured over the producing HP/HT Franklin and Elgin gas condensate fields then inverted to production-induced stress and strain changes throughout the reservoir, overburden and underburden...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2867
... ABSTRACT Reservoir compaction from oil and gas production results in surface subsidence and time-lapse timeshifts. The areal distribution of the subsidence and timeshift data yield information about the magnitude and distribution of compaction in the reservoir. Areal measurements...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-1615
...Estimation of production induced stress changes from 4D finite offset timeshifts. Keith Hawkins*, Graham Conroy, Veritas DGC, Peter Harris, formerly Veritas DGC, now Rock Solid Images. Summary Significant stress changes are generated when producing reservoirs compact due to large reductions...
Proceedings Papers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-2500
... ABSTRACT Time-lapse timeshifts refer to the differences in two-way seismic travel times that are frequently observed in the analysis of time-lapse seismic surveys. One source of timeshifts originates inside the reservoir interval as a result of changes in the pore-fluid properties that alter...
Proceedings Papers
P.J. Hatchell, A. van den Beukel, M.M. Molenaar, K.P. Maron, C.J. Kenter, J.G.F. Stammeijer, J.J. van der Velde, C.M. Sayers
Publisher: Society of Exploration Geophysicists
Paper presented at the 2003 SEG Annual Meeting, October 26–31, 2003
Paper Number: SEG-2003-1330
... geomechanical model timeshift depletion non-reservoir rock seismic data Whole earth 4D: reservoir monitoring geomechanics. P.J. Hatchell*, A. van den Beukel, M.M. Molenaar, K.P. Maron, and C.J. Kenter, Shell International Exploration and Production Rijswijk; and J.G.F. Stammeijer, J.J. van der Velde...