4D Pre-stack Inversion Workflow Integrating Reservoir Model Control and Lithology Supervised Classification

Toinet, S.; Maultzsch, S.; Souvannavong, V.; Colnard, O.

doi:10.3997/2214-4609.201400603

Cited by 2 publications

(1 citation statement)

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“…Thus, another approach is to build the geologic model using both the 3D and/or 4D seismic data and then production history match (Castro et al, 2006). More recently, many more possibilities for closing the loops among 3D and 4D seismic data, production data and the simulation/geologic model have become possible with the advent of techniques to determine 4D impedance changes (El-Quair et al, 2005;Toinet et al, 2011) and pressure and saturation changes (Landrø, 2001;Tura and Lumley, 1999;MacBeth et al, 2006). Figure 1 illustrates the various options now available for closing the loop, labeled as the reservoir, static, dynamic, and history-matching loops.…”

Section: Introductionmentioning

confidence: 99%

Closing the loops using engineering-consistent 4D seismic inversion

2014

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An updating strategy is designed to iteratively close the loop among fluid-flow simulation predictions and measured production history, predicted and observed 4D seismic data, and finally predicted and inverted impedance/impedance changes. The central ingredient in this scheme is the inversion to elastic property changes from the seismic in an engineering-consistent manner. The geometry, volumetrics, and transmissibility multipliers for the reservoir model are updated in three successive stages, and success is monitored by a comparison between the seismic and fluid-flow domains. The workflow is implemented on a West African field, where reservoir model improvements are obtained in combination with a consistency among model, impedance, and seismic domains.

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Section: Introductionmentioning

confidence: 99%

Closing the loops using engineering-consistent 4D seismic inversion

2014

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Joint AVO Inversion for Time-Lapse Elastic Reservoir Properties

Kato

Stewart

2012

Abu Dhabi International Petroleum Conference and Exhibition

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For time-lapse seismic inversion, it is common that baseline and monitor survey data are separately inverted to elastic properties. Elastic property changes are obtained from difference in the two inversion results. Buland and Quair (2006) proposed novel time-lapse inversion method based on the Bayesian theorem, in which posterior distribution of elastic property change are obtained from seismic data difference between two surveys along with the prior information. However, individual elastic properties at baseline (or repeat) survey cannot be simultaneously obtained. Moreover, they assumed constant wavelet although individual wavelets are commonly used in different vintage data. Therefore, to overcome the limitations, we have developed a new time-lapse seismic inversion method. The method uses both baseline and monitor survey data, instead of only uses the difference, and simultaneously obtains elastic properties (e.g., P- and S-wave velocities and density) at baseline survey and the changes at monitor survey as well as the uncertainties. Furthermore, the developed method allows us to use individual wavelet in each seismic data, resulting in multicomponent data which can be used. The method is applied to Hangingstone oilfield in Canada, where heavy-oil with 8.5 °API has been produced by SAGD method and time-lapse seismic data were acquired; baseline survey in 2002 and repeat survey in 2006. Both P-P and P-S data are available in the monitor survey while only P-P data is available in the baseline survey. We use all the available seismic data to obtain initial elastic properties at the baseline survey, which reasonably well agree with well log data, as well as the elastic property change due to steam injection. Furthermore, the elastic property change is converted to temperature change within reservoir by using heavy-oil rock physics model, which are reasonably consistent with measurement at observation wells.

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4D Pre-stack Inversion Workflow Integrating Reservoir Model Control and Lithology Supervised Classification

Cited by 2 publications

References 5 publications

Closing the loops using engineering-consistent 4D seismic inversion

Closing the loops using engineering-consistent 4D seismic inversion

Joint AVO Inversion for Time-Lapse Elastic Reservoir Properties

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