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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
DOI: 10.1306/01271513101
Advances in grain-size, mineral, and pore-scale characterization of lithic and clay-rich reservoirs
K. E. Higgs,1 M. J. Arnot,2 and S. Brindle3
1GNS Science, 1 Fairway Drive, Avalon, P.O. Box 30 368, Lower Hutt, New Zealand; [email protected]
2GNS Science, 1 Fairway Drive, Avalon, P.O. Box 30 368, Lower Hutt, New Zealand; [email protected]
3Robertson UK Ltd., Tyn-y-Coed, Pentywyn Road, Llandudno LL30 1SA, United Kingdom; [email protected]
ABSTRACT
Clay- and lithic-rich sandstones are difficult to characterize through uncored well
sections in terms of their grain size, porosity, and mineralogy, all of which are required for assessing reservoir quality and production performance. This paper presents results from a study through one such interval and shows how a combination of different techniques can be used to better understand rock properties of complex reservoirs, thereby helping to reduce reservoir uncertainty.
In this study, mean data from laser grain-size analysis
are comparable to point-counted grain size, and both are considered as viable analytical methods. Automated quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN®) provides a further useful and consistent grain-size measurement that can be applied to both core and cuttings samples. The QEMSCAN has also proved to be a valuable technique in the mineralogical
analysis
of sandstones that are lithic, clay- and feldspar-rich, eliminating the subjective nature that is inherent with optical
analysis
.
Results from the studied interval show that porosity measured by conventional core analysis
(CA) and mercury injection capillary pressure (MICP)
analysis
are generally comparable with
log
-derived total porosity. Porosity measured from point-counting and QEMSCAN techniques is significantly lower than total porosity, with the QEMSCAN porosity locally equivalent to
log
-derived effective porosity. Both point-count and QEMSCAN porosities show better correlations with permeability (
and 0.94, respectively) than total porosity values (
and 0.60 CA and MICP, respectively), suggesting that they might provide a measure of effective porosity in high-quality reservoir rocks.
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