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Title: MORPHOLOGY OF METHANE HYDRATE HOST SEDIMENTS.

Abstract

Results from simulated experiments in several laboratories show that host sediments influence hydrate formation in accord with known heterogeneity of host sediments at sites of gas hydrate occurrence (1). For example, in Mackenzie Delta, NWT Canada (Mallik 2L-38 well), coarser-grained units (pore-filling model) are found whereas in the Gulf of Mexico, the found hydrate samples do not appear to be lithologically controlled. We have initiated a systematic study of sediments, initially focusing on samples from various depths at a specific site, to establish a correlation with hydrate occurrence (or variations thereof) to establish differences in their microstructure, porosity, and other associated properties. The synchrotron computed microtomography (CMT) set-up at the X-27A tomography beam line at the National Synchrotron Light Source (NSLS), Brookhaven National Laboratory was used as a tool to study sediments from Blake Ridge at three sub bottom depths of 0.2, 50, and 667 meters. Results from the tomographic analysis of the deepest sample (667 m) are presented here to illustrate how tomography can be used to obtain new insights into the structures of methane hydrate host sediments. The investigation shows the internal grain/pore space resolution in the microstructure and a 3-D visualization of the connecting pathways obtained followingmore » data segmentation into pore space and grains within the sediment sample. The analysis gives the sample porosity, specific surface area, mean particle size, and tortuosity, as well. An earlier report on the experimental program has been given by Mahajan et al. (2).« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
BROOKHAVEN NATIONAL LABORATORY (US)
Sponsoring Org.:
DOE/SC (US)
OSTI Identifier:
15011261
Report Number(s):
BNL-73670-2005-CP
R&D Project: EE-333-EEDA; KC0303010; TRN: US0500930
DOE Contract Number:  
AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: 229TH AMERICAN CHEMICAL SOCIETY NATIONAL MEETING, SYMPOSIUM ON GAS HYDRATES AN CLATHRATES, SAN DIEGO, CA (US), 03/13/2005--03/17/2005; Other Information: PBD: 1 Dec 2004
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CLATHRATES; FOCUSING; GAS HYDRATES; GULF OF MEXICO; HYDRATES; METERS; MICROSTRUCTURE; MORPHOLOGY; NSLS; PARTICLE SIZE; POROSITY; RESOLUTION; SEDIMENTS; SPECIFIC SURFACE AREA; SYNCHROTRONS; TOMOGRAPHY

Citation Formats

JONES,K.W., FENG,H., TOMOV,S., WINTER,W.J., EATON,M., and MAHAJAN,D. MORPHOLOGY OF METHANE HYDRATE HOST SEDIMENTS.. United States: N. p., 2004. Web.
JONES,K.W., FENG,H., TOMOV,S., WINTER,W.J., EATON,M., & MAHAJAN,D. MORPHOLOGY OF METHANE HYDRATE HOST SEDIMENTS.. United States.
JONES,K.W., FENG,H., TOMOV,S., WINTER,W.J., EATON,M., and MAHAJAN,D. Wed . "MORPHOLOGY OF METHANE HYDRATE HOST SEDIMENTS.". United States. doi:. https://www.osti.gov/servlets/purl/15011261.
@article{osti_15011261,
title = {MORPHOLOGY OF METHANE HYDRATE HOST SEDIMENTS.},
author = {JONES,K.W. and FENG,H. and TOMOV,S. and WINTER,W.J. and EATON,M. and MAHAJAN,D.},
abstractNote = {Results from simulated experiments in several laboratories show that host sediments influence hydrate formation in accord with known heterogeneity of host sediments at sites of gas hydrate occurrence (1). For example, in Mackenzie Delta, NWT Canada (Mallik 2L-38 well), coarser-grained units (pore-filling model) are found whereas in the Gulf of Mexico, the found hydrate samples do not appear to be lithologically controlled. We have initiated a systematic study of sediments, initially focusing on samples from various depths at a specific site, to establish a correlation with hydrate occurrence (or variations thereof) to establish differences in their microstructure, porosity, and other associated properties. The synchrotron computed microtomography (CMT) set-up at the X-27A tomography beam line at the National Synchrotron Light Source (NSLS), Brookhaven National Laboratory was used as a tool to study sediments from Blake Ridge at three sub bottom depths of 0.2, 50, and 667 meters. Results from the tomographic analysis of the deepest sample (667 m) are presented here to illustrate how tomography can be used to obtain new insights into the structures of methane hydrate host sediments. The investigation shows the internal grain/pore space resolution in the microstructure and a 3-D visualization of the connecting pathways obtained following data segmentation into pore space and grains within the sediment sample. The analysis gives the sample porosity, specific surface area, mean particle size, and tortuosity, as well. An earlier report on the experimental program has been given by Mahajan et al. (2).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 2004},
month = {Wed Dec 01 00:00:00 EST 2004}
}

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