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Use of the photoelectric effect as a reservoir quality indicator in the Niobrara Formation, Piceance Basin, northwest Colorado

Martin Krueger
Use of the photoelectric effect as a reservoir quality indicator in the Niobrara Formation, Piceance Basin, northwest Colorado
Interpretation (Tulsa) (February 2018) 6 (1): SA1-SA5

Abstract

The late Cretaceous Niobrara Formation and underlying lower Mancos Group have significant petroleum potential in the Piceance Basin of northwest Colorado. Relative to the Denver Basin Niobrara, the Piceance Basin Niobrara has had significantly less drilling activity, and therefore fewer subsurface data are available. There are several key geologic differences pertaining to the Niobrara depositional history in these two basins. First, the overall thickness of the formation increases greatly to the west. Thicknesses of 91.4 m (300 ft), common in the Denver Basin, become thicknesses of as much as 548.6 m (1800 ft) in the Piceance Basin. Second, to date, maximum total organic carbon (TOC) values from the Piceance Basin are approximately 3 wt%, whereas in the Denver Basin, TOC values may be as high as 8 wt%. Several factors may contribute to the lesser TOC, but a significant factor is the dilution of organic material by increasing siliciclastic deposition. Unlike the Denver Basin stratigraphy of organic-rich marls providing the bulk of sourcing to carbonate-rich benches of greater fracture porosity, TOC and carbonate richness are coupled in the Piceance Basin. Core and well-log data suggest that the Piceance Basin Niobrara Formation's carbonate-rich strata have higher TOC content relative to the interlaying clay-rich strata. This relationship enables the use of the photoelectric effect, the PEF or PE log, to map trends of carbonate richness and classify reservoir quality, where carbonate and organics may be at maximum values. In other unconventional reservoirs that share similar depositional histories and display the positive correlation between carbonate and organic richness, the PEF curve should be used for reservoir quality screening purposes.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 6
Serial Issue: 1
Title: Use of the photoelectric effect as a reservoir quality indicator in the Niobrara Formation, Piceance Basin, northwest Colorado
Author(s): Krueger, Martin
Affiliation: ConocoPhillips Company, Houston, TX, United States
Pages: SA1-SA5
Published: 201802
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 6
Accession Number: 2019-006670
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Special section; The Niobrara Petroleum System, a multibasin resource play in the Rockies
Illustration Description: illus. incl. sketch maps
N38°45'00" - N40°30'00", W109°00'00" - W107°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201906
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