skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: An experimental study of organic-inorganic interactions during vitrinite maturation

Abstract

Vitrinite reflectance is a parameter widely used to determine the extent of thermal maturation in sedimentary basins. Laboratory heating experiments were conducted to examine the role of aqueous fluid and sediment composition, temperature, and time on the development of vitrinite reflectance at elevated temperatures and pressures. Samples of organic-lean Middle Valley sediment containing dispersed vitrinite and Wyodak Coal composed almost entirely of vitrinite were heated in the presence of compositionally variable aqueous fluids at 225 to 375 C and 350 bars. Inorganic fluid composition was monitored as a function of time, and vitrinite reflectance was measured at the termination of each experiment. Results of this study demonstrate that the geochemical environment surrounding vitrinite influences the rate of maturation. The presence of water may facilitate reaction pathways that are not readily available in dry systems. Vitrinite maturation profiles that deviate from what are considered to be normal trends may reflect subsurface variations in the composition of pore fluids or the presence or absence of an aqueous phase in contact with vitrinite particles. Accordingly, kinetic models that consider organic reactions responsible for increased vitrinite reflectance in terms of time and temperature alone may not accurately account for geochemical processes occurring in naturalmore » systems.« less

Authors:
; ;
Publication Date:
Research Org.:
Woods Hole Oceanographic Institution, MA (US)
OSTI Identifier:
20062615
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta
Additional Journal Information:
Journal Volume: 64; Journal Issue: 9; Other Information: PBD: May 2000; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; VITRINITE; REFLECTIVITY; MATURATION; COAL DEPOSITS; SUBBITUMINOUS COAL; GEOCHEMISTRY

Citation Formats

Seewald, J.S., Eglinton, L.B., and Ong, Y.L. An experimental study of organic-inorganic interactions during vitrinite maturation. United States: N. p., 2000. Web. doi:10.1016/S0016-7037(00)00339-2.
Seewald, J.S., Eglinton, L.B., & Ong, Y.L. An experimental study of organic-inorganic interactions during vitrinite maturation. United States. doi:10.1016/S0016-7037(00)00339-2.
Seewald, J.S., Eglinton, L.B., and Ong, Y.L. Mon . "An experimental study of organic-inorganic interactions during vitrinite maturation". United States. doi:10.1016/S0016-7037(00)00339-2.
@article{osti_20062615,
title = {An experimental study of organic-inorganic interactions during vitrinite maturation},
author = {Seewald, J.S. and Eglinton, L.B. and Ong, Y.L.},
abstractNote = {Vitrinite reflectance is a parameter widely used to determine the extent of thermal maturation in sedimentary basins. Laboratory heating experiments were conducted to examine the role of aqueous fluid and sediment composition, temperature, and time on the development of vitrinite reflectance at elevated temperatures and pressures. Samples of organic-lean Middle Valley sediment containing dispersed vitrinite and Wyodak Coal composed almost entirely of vitrinite were heated in the presence of compositionally variable aqueous fluids at 225 to 375 C and 350 bars. Inorganic fluid composition was monitored as a function of time, and vitrinite reflectance was measured at the termination of each experiment. Results of this study demonstrate that the geochemical environment surrounding vitrinite influences the rate of maturation. The presence of water may facilitate reaction pathways that are not readily available in dry systems. Vitrinite maturation profiles that deviate from what are considered to be normal trends may reflect subsurface variations in the composition of pore fluids or the presence or absence of an aqueous phase in contact with vitrinite particles. Accordingly, kinetic models that consider organic reactions responsible for increased vitrinite reflectance in terms of time and temperature alone may not accurately account for geochemical processes occurring in natural systems.},
doi = {10.1016/S0016-7037(00)00339-2},
journal = {Geochimica et Cosmochimica Acta},
issn = {0016-7037},
number = 9,
volume = 64,
place = {United States},
year = {2000},
month = {5}
}