The Heidrun Field: monitoring fluid flow in the complex Åre Formation

Røste, T.; Moen, Anita; Kolstø, E.; Brekken, Mali; Thrana, C.; Husby, Oddvar; Lescoffit, G.

doi:10.3997/1365-2397.2009007

Cited by 5 publications

(2 citation statements)

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“…For 4D seismic data, in particular, there are many good examples of direct imaging of waterflood direction, shape and distribution (for example, Røste et al, 2009). However, an important disadvantage of the seismic is the lack of acoustic contrast between some heavier oils and the injected/formation waters (see, for example, the measurements of Batzle et al, 2006).…”

Section: Brine Resistivity As a Function Of Salinity And Temperaturementioning

confidence: 99%

Potential applications of time-lapse CSEM to reservoir monitoring

Salako¹,

MacBeth²,

MacGregor³

2015

First Break

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Section: Brine Resistivity As a Function Of Salinity And Temperaturementioning

confidence: 99%

Potential applications of time-lapse CSEM to reservoir monitoring

Salako¹,

MacBeth²,

MacGregor³

2015

First Break

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“…Despite some excellent examples of vertical sections from 4D seismic data (Clifford et al 2003;Røste et al 2009), mapbased attributes remain in common use for 4D seismic interpretation as they combine the accepted visual benefits of lateral continuity with ease of use and robustness. Indeed, from maps of a suitable attribute derived at a top reservoir or perhaps a known fluid contact, it is relatively straightforward to build an understanding of the causal relationship between well production and recovery and time-lapsed seismic signatures (Huang et al 2011).…”

Section: Introductionmentioning

confidence: 99%

An insightful parametrization for the flatlander's interpretation of time‐lapsed seismic data

Alvarez

MacBeth

2013

Geophysical Prospecting

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A B S T R A C TAn approximation is developed that allows mapped 4D seismic amplitudes and timeshifts to be related directly to the weighted linear sum of pore pressure and saturation changes. The weights in this relation are identified as key groups of parameters from a petroelastic model and include the reservoir porosity. This dependence on groups of parameters explains the inherent non-uniqueness of this problem experienced by previous researchers. The proposed relation is of use in 4D seismic data feasibility studies and inversion and interpretation of the 4D seismic response in terms of pore pressure and water saturation changes. A further result is drawn from analysis of data from the North Sea and West Africa, which reveals that the relative interplay between the effects of pore pressure and saturation changes on the seismic data can be simplified to the control of a single, spatially variant parameter C S /C P . Combining these results with those from published literature, we find that C S /C P = 8 appears to be a generality across a range of clastic reservoirs with a similar mean porosity. Using this C S /C P value, an in situ seismic-scale constraint for the rock stress sensitivity component of the petroelastic model is constructed considering this component carries the largest uncertainty.

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Quantifying remaining oil saturation using time-lapse seismic amplitude changes at fluid contacts

Alvarez

MacBeth

Brain

2016

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Our study shows that time-lapse changes in the amplitude of the seismic reflection at an oil–water contact (OWC) and/or produced OWC can be used to estimate directly the displacement efficiency of water displacing oil, E D , without the need of a rock and fluid physics model. From this value, it is possible to determine the remaining oil saturation if required. A preliminary application is performed using several published literature examples, which are reinterpreted to assess the average E D and ensure that the theory is consistent with expectations. Next, a North Sea field model with a known E D is used to create fluid-flow predictions and the corresponding synthetic time-lapse seismic data. Application to these data again confirms the basic principles of the method and defines the accuracy when applied to 4D seismic data. Finally, an observed 4D seismic dataset from a producing field in the North Sea is analysed. The results suggest a displacement efficiency of between 21 and 65% with an accuracy of 3% due to data non-repeatability (with a NRMS of between 11 and 13%). Given an average irreducible water saturation of 0.32, this calculates the remaining oil saturations at between 24 and 53% for this field. A prerequisite for use of the proposed OWC approach is that a discrete contact be interpreted on either the 3D or 4D seismic datasets. Therefore, successful application of this technique requires moderate- to high-quality seismic data and a fairly thick reservoir sequence without significant structural complexity.

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The Heidrun Field: monitoring fluid flow in the complex Åre Formation

Cited by 5 publications

References 0 publications

Potential applications of time-lapse CSEM to reservoir monitoring

Potential applications of time-lapse CSEM to reservoir monitoring

An insightful parametrization for the flatlander's interpretation of time‐lapsed seismic data

Quantifying remaining oil saturation using time-lapse seismic amplitude changes at fluid contacts

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