Hertel - Shell Intl. E&P
Hertel is a research physicist at Shell Intl. E&P Inc. in Houston, Texas.
He holds a master’s degree in physics from the University of Leipzig, Germany
and a Ph.D. in physics from the Victoria University of Wellington, New Zealand.
In 2018 he was awarded the Giulio Cesare Borgia prize at the International
Conference on Magnetic Resonance in Porous Media.
Abstract: Paper F
Digital Rock technologies were developed
to augment traditional core analysis and led to a much improved understanding
of the microstructure of many rock core types. However, to produce an upscaled
description of the reservoir, one must consolidate the measurements in scale
over six orders of magnitude. Here, we show that a whole core CT scan may serve
as the natural link between the length scales of Digital Rocks and modern
logging tools. While the CT scan contains a fingerprint of the structure of the
reservoir, the Digital Rock models show the microscopic composition of each CT
scan voxel. For upscaling purposes, we established a quadratic correlation between
the grey values in a CT scan and the porosities measured on core plugs. This
correlation allowed us to generate a synthetic porosity log of millimeter
resolution. After that, the length scale was increased by moving averages in
the vertical direction. We investigated a thin bed reservoir with layers of
halite filled sandstone alternating with layers free of halite at variable
layer thicknesses. In this reservoir, the resulting synthetic porosity log compared
well with the NMR log porosity within the uncertainty band over a total depth
interval of 53.6 meters. We propose that field decisions could be accelerated
if the quadratic correlation parameters are general for these types of
sediment. In this case, one may generate synthetic porosity logs as soon as the
CT scan is available, which is typically the first step in standard core analysis.
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