Offshore Northern Europe: Strontium isotope analysis can help define compartmentalization

This article describes how strontium isotope (87Sr/86) ratios in formation waters are used to evaluate compartmentalization of hydrocarbon reservoirs.Strontium Isotope Residual Salt Analysis (SrRSA) of core samples provides a means of measuring the 87Sr/86 ratios in formation water from hydrocarbon columns and aquifers. Smooth SrRSA profiles suggest progressive, uninterrupted filling and the absence of sealed barriers, while a step change in a profile normally suggests a barrier sealed updip from the well penetration.Inferences about lateral connectivity are made by comparing SrRSA profiles from neighboring wells at true vertical depth (TVD). Profiles that are superimposed when plotted at...

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