Solid-state NMR characterization of Mowry Formation shales
Abstract
Solid-state {sup 13}C and {sup 29}Si NMR measurements were carried out on a series of petroleum source rocks from the Mowry Formation of the Powder River Basin in Wyoming. The objectives of this study wereto use CP/MAS {sup 13}C NMR measurements to monitor changes in the carbon structure of the kerogen that result from depth of burial, and to examine the feasibility of {sup 29}Si NMR for studying the thermal alteration of clay minerals during diagenesis. Carbon and silicon NMR measurements were made on a suite of samples covering a present-day depth interval of 3,000 to 11,500 ft.In general, the NMR results endorsed other geochemical analyses that were performed on the source rocks as part of another study to examine pressure compartmentalization in the Mowry Formation. The carbon aromaticity of the kerogen increased with depth of burial, and at depths greater that approximately 10,000 ft the kerogen showed little capacity to generate additional oil because of the small fraction of residual aliphatic carbon. By combining NMR and Rock-Eval measurements, an estimate of the hydrogen budget was obtained. The calculations indicated that approximately 20% of the kerogen was converted to hydrocarbons, and that sufficient hydrogen was liberated from aromatization and condensationmore »
- Authors:
- Publication Date:
- Research Org.:
- Western Research Inst., Laramie, WY (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States); Gas Research Inst., Chicago, IL (United States)
- OSTI Identifier:
- 10131870
- Report Number(s):
- DOE/MC/11076-3196
ON: DE93000235; CNN: Contract 5089-260-1894
- DOE Contract Number:
- FC21-86MC11076; FG05-89ER75506
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: Apr 1992
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 02 PETROLEUM; 58 GEOSCIENCES; WYOMING; PETROLEUM DEPOSITS; SOURCE ROCKS; NMR SPECTRA; KEROGEN; STRUCTURAL CHEMICAL ANALYSIS; CARBON 13; SILICON 29; NUCLEAR MAGNETIC RESONANCE; DIAGENESIS; ILLITE; SMECTITE; SHALES; EXPERIMENTAL DATA; GEOCHEMISTRY; 020200; 580000; RESERVES, GEOLOGY, AND EXPLORATION; GEOSCIENCES
Citation Formats
Miknis, F P. Solid-state NMR characterization of Mowry Formation shales. United States: N. p., 1992.
Web. doi:10.2172/10131870.
Miknis, F P. Solid-state NMR characterization of Mowry Formation shales. United States. https://doi.org/10.2172/10131870
Miknis, F P. 1992.
"Solid-state NMR characterization of Mowry Formation shales". United States. https://doi.org/10.2172/10131870. https://www.osti.gov/servlets/purl/10131870.
@article{osti_10131870,
title = {Solid-state NMR characterization of Mowry Formation shales},
author = {Miknis, F P},
abstractNote = {Solid-state {sup 13}C and {sup 29}Si NMR measurements were carried out on a series of petroleum source rocks from the Mowry Formation of the Powder River Basin in Wyoming. The objectives of this study wereto use CP/MAS {sup 13}C NMR measurements to monitor changes in the carbon structure of the kerogen that result from depth of burial, and to examine the feasibility of {sup 29}Si NMR for studying the thermal alteration of clay minerals during diagenesis. Carbon and silicon NMR measurements were made on a suite of samples covering a present-day depth interval of 3,000 to 11,500 ft.In general, the NMR results endorsed other geochemical analyses that were performed on the source rocks as part of another study to examine pressure compartmentalization in the Mowry Formation. The carbon aromaticity of the kerogen increased with depth of burial, and at depths greater that approximately 10,000 ft the kerogen showed little capacity to generate additional oil because of the small fraction of residual aliphatic carbon. By combining NMR and Rock-Eval measurements, an estimate of the hydrogen budget was obtained. The calculations indicated that approximately 20% of the kerogen was converted to hydrocarbons, and that sufficient hydrogen was liberated from aromatization and condensation reactions to stabilize the generated products. The {sup 29}Si NMR spectra were characterized by a relatively sharp quartz resonance and a broad resonance from the clay minerals. With increasing depth of burial, the clay resonance became broader and shifted slightly downfield. These changes qualitatively support X-ray analysis that shows progressive alteration of illite to smectite with depth of burial.},
doi = {10.2172/10131870},
url = {https://www.osti.gov/biblio/10131870},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 01 00:00:00 EST 1992},
month = {Wed Apr 01 00:00:00 EST 1992}
}