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3D Probabilistic Well-log Analysis With Uncertain Location Data
  • Iris Fernandes,
  • Klaus Mosegaard
Iris Fernandes
Niels Bohr institute - University of Copenhagen

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Klaus Mosegaard
Niels Bohr Institute - University of Copenhagen
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We developed a method for quantification of uncertainties on spatial data acquired at points with uncertain location coordinates. We applied it to well-log data from wells with uncertain trajectories. The method is fully probabilistic and requires few a priori assumptions on the Earth model and the wellbore geometry. We performed simulations of well trace and well-logging showing how the total uncertainty of well-log data vary according to the variability of subsurface properties, and how the reliability of well-log interpretations close to layer boundaries may be compromised.