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Reflectance spectroscopic mapping of diagenetic heterogeneities and fluid-flow pathways in the Jurassic Navajo Sandstone

Brenda Beitler Bowen, Brigette A. Martini, Marjorie A. Chan and William T. Parry
Reflectance spectroscopic mapping of diagenetic heterogeneities and fluid-flow pathways in the Jurassic Navajo Sandstone
AAPG Bulletin (February 2007) 91 (2): 173-190

Abstract

Multiple episodes of fluids migrating through the Jurassic Navajo Sandstone have resulted in abundant and spatially variable diagenetic mineral changes. Depending on fluid chemistry, flow events have produced or removed varying amounts of iron oxides, clays, and carbonates with distinctive spectral reflectance signatures that can be used to map spatial heterogeneities in diagenetic mineralogy and paleofluid-migration pathways (including hydrocarbons and groundwaters). Field and laboratory reflectance spectroscopy shows that the common diagenetic minerals in the Navajo Sandstone have diagnostic visible, near-infrared, and short-wave infrared spectral characteristics in the 0.35-2.5-mu m range. Comparisons of (1) geochemical data, (2) in-situ reflectance spectroscopy, and (3) airborne imaging spectroscopy for zones of variably altered Navajo Sandstone in southern Utah show that the minerals within alteration facies have distinctive spectral signatures. Reflectance spectroscopic mapping provides a method for evaluating the effects of diagenesis and fluids in this well-exposed reservoir sandstone. Reservoir heterogeneity in many eolian sandstones is largely controlled by diagenetic processes that can be difficult to evaluate on outcrop to reservoir scales (approximately tens to hundreds of meters to several kilometers). Imaging spectroscopy allows for the evaluation of mineralogy variations on these scales. The patterns of authigenic iron oxide, clay, and carbonate removal and precipitation trace the paths of different episodes of fluid flow and sandstone alteration. Mineral variations occur as kilometer-scale reaction fronts related to structural fluid conduits and as 100-m (330-ft)-scale changes that follow stratigraphy. These spectroscopic techniques provide important tools for reservoir evaluation, and the patterns observed serve as an analog to understanding regional diagenetic patterns in other subsurface eolian reservoirs.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 91
Serial Issue: 2
Title: Reflectance spectroscopic mapping of diagenetic heterogeneities and fluid-flow pathways in the Jurassic Navajo Sandstone
Affiliation: University of Utah, Department of Geology and Geophysics, Salt Lake City, UT, United States
Pages: 173-190
Published: 200702
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 67
Accession Number: 2007-023066
Categories: Economic geology, geology of energy sourcesSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N37°00'00" - N38°00'00", W112°25'00" - W110°58'00"
Secondary Affiliation: Amber Scientific, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States
Update Code: 200713
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