Evidence for reduced quartz-cementation rates in oil-filled sandstones

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doi: 10.1130/0091-7613(2001)029<0915:EFRQCR>2.0.CO;2
Authors:Marchand, Ann M. E.; Haszeldine, R. Stuart; Smalley, P. Craig; Macaulay, Calum I.; Fallick, Anthony E.
Author Affiliations:Primary:
University of Edinburgh, Department of Geology and Geophysics, Edinburgh, United Kingdom
BP Research Centre at Sunbury-on-Thames, United Kingdom
Scottish Universities Environmental Research Centre, United Kingdom
Volume Title:Geology (Boulder)
Source:Geology (Boulder), 29(10), p.915-918. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613
Publication Date:2001
Note:In English. 13 refs.; illus., incl. 1 table, sketch map
Summary:When quartz-rich sands are buried and heated, pore space is gradually filled by precipitation of quartz cement from aqueous formation fluids. Here we examine whether the presence of oil in the pore space can retard or halt this loss of porosity by slowing or stopping quartz cementation. The effect of oil fill on quartz cementation is examined by using the distribution of quartz cement in the Brae Formation deep-water sandstone reservoir of the Miller oil field (North Sea). Petrographic data demonstrate that sandstones from the oil zone have much less quartz cement, and more porosity, than sandstones from the water zone. Sandstones in both oil and water zones are compositionally and texturally identical and have been affected by a similar burial history. Kinetic modeling of the cementation process suggests that progressive oil charging has slowed quartz-cement growth rates by at least two orders of magnitude, halting it completely in the most extreme cases. Our data demonstrate that early oil charging in the crestal part of an anticline can preserve porosity in deeply buried sandstones. This knowledge is especially relevant to porosity prediction for petroleum exploration in deeply buried sandstones.
Subsections:Sedimentary petrology
Subjects:Anticlines; Burial; Cathodoluminescence; Cementation; Clastic rocks; Diagenesis; Experimental studies; Folds; Framework silicates; Kinetics; Models; Oil and gas fields; Petrography; Petroleum; Petroleum engineering; Porosity; Quartz; Rates; Reservoir properties; Reservoir rocks; Sandstone; Sedimentary rocks; SEM data; Silica minerals; Silicates; Textures; Water; Atlantic Ocean; North Atlantic; North Sea; Brae Formation; Miller Field
Coordinates:N584000 N585500 E0013000 E0010000
Abstract Numbers:02M/2226
Record ID:2001073330
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
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