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Analysis of the Influence of Water Salinity On Time-Lapse Seismic ResponseNormal access

Authors: F. Borges and M. Landrø
Event name: 79th EAGE Conference and Exhibition 2017
Session: Time-Lapse Seismic Interpretation
Publication date: 12 June 2017
DOI: 10.3997/2214-4609.201700763
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 593.23Kb )
Price: € 20

Summary:
Injection of seawater is one of the most employed IOR methods in offshore fields. It is also a method that can be monitored with time-lapse seismic in most reservoirs. However, several case studies of seismic monitoring disregard the contrast of salinity between the injected water and the formation brine, for this is considered too faint to have any noticeable effect in the 4D signal. In this work, we present an analysis of the impact of water salinity on the seismic-derived estimations of reservoir dynamic properties. The analysis is initially performed in modeled, noise-free data. Then, artificial noise is added to the modeled data and the uncertainty of the measurements is estimated. Our results show that the direct estimations of salinity are very sensitive to seismic noise levels, but accounting for it can lead to more reliable results for saturation and pressure.


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