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Lateral periodic variations in the petrophysical and geochemical properties of dolomite

David A. Budd, Matthew J. Pranter and Zulfiquar A. Reza
Lateral periodic variations in the petrophysical and geochemical properties of dolomite
Geology (Boulder) (May 2006) 34 (5): 373-376

Abstract

Mississippian dolowackestones contain periodic oscillations in the lateral distribution of trace-element concentrations, porosity, and permeability. Random variations at < or =30 cm spacing account for 50%-70% of the total variability. The remainder of the variability occurs in short- and long-range oscillatory patterns with periods of 1.2-7.6 m, which can only be resolved by high-resolution sampling of an approximately 150 m lateral transect. Possible origins for these patterns are: (1) inheritance from the depositional precursor, (2) formation by self-organizing processes during dolomitization, or (3) overprinting by late diagenesis. These oscillatory patterns have up to now been unrecognized, and addressing their origin and meaning(s) represents a new approach to the study of dolomites. Understanding the lateral distribution of petrophysical properties can also improve models of fluid flow in dolomite petroleum reservoirs and contaminant transport between matrix and conduits in dolomite aquifers. Further, if 30%-50% of the variability in a geochemical attribute in any bed is due to lateral periodicity, one must ask if that variability is too great to assume a spot sample will be a suitable proxy for ancient geologic processes and conditions.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 34
Serial Issue: 5
Title: Lateral periodic variations in the petrophysical and geochemical properties of dolomite
Affiliation: University of Colorado, Department of Geological Sciences, Boulder, CO, United States
Pages: 373-376
Published: 200605
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 23
Accession Number: 2006-049737
Categories: Sedimentary petrologyGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2006074
Illustration Description: illus.
N44°36'45" - N44°36'45", W108°08'10" - W108°08'10"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200627
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