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Utilizing a Pseudo-State Flow Equation for Estimation of Pressure and Saturation Changes
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 75th EAGE Conference & Exhibition incorporating SPE EUROPEC 2013, Jun 2013, cp-348-00095
- ISBN: 978-90-73834-48-4
Abstract
In this paper we present simple, first order expressions for pore pressure predictions and time lapse seismic travel timeshifts to discriminate between pressure and saturation changes as a result of hydrocarbon production or CO2 injection. To account for reservoir seals, the pressure distribution is modeled by employing a pseudo-state flow equation in combination with a superpositioning method. The approach is successfully applied to a synthetic and a real data example, investigating travel timeshift changes during CO2 injection. We find a good correlation between synthetic and modeled data. Since our method is valid for homogeneous reservoir conditions and returns spatially low frequent results, capturing the complex heterogeneities of the real data example is challenging. The advantage of our method is its fast application to estimate first order effects of pressure and saturation changes on time lapse seismic data using a simple inversion algorithm instead of time consuming simulations.