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Book Chapter

Laboratory Measurements on Core-scale Sediment and Hydrate Samples to Predict Reservoir Behavior

By
Timothy J. Kneafsey
Timothy J. Kneafsey
Lawrence Berkeley National Laboratory, Berkeley, California, U.S.A.
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Yongkoo Seol
Yongkoo Seol
Lawrence Berkeley National Laboratory, Berkeley, California, U.S.A.
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George J. Moridis
George J. Moridis
Lawrence Berkeley National Laboratory, Berkeley, California, U.S.A.
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Liviu Tomutsa
Liviu Tomutsa
Lawrence Berkeley National Laboratory, Berkeley, California, U.S.A.
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Barry M. Freifeld
Barry M. Freifeld
Lawrence Berkeley National Laboratory, Berkeley, California, U.S.A.
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Published:
January 01, 2009

Abstract

Measurements on hydrate-bearing laboratory and field samples are needed to provide realistic bounds on parameters used in the numerical modeling of the production of natural gas from hydrate-bearing reservoirs. These parameters include thermal conductivity, permeability, relative permeability-saturation relationships, and capillary-pressure-saturation relationships. We have developed a technique to make hydrate-bearing samples, ranging in scale from core-plug-size to core-size, in the laboratory to facilitate making these measurements. In addition to pressure and temperature measurements, we use x-ray computed-tomography (CT) scanning to provide high-resolution spatial data providing insights on location-specific processes occurring in our samples. Computed tomography allows us to better attribute measured quantities to locations where processes occur and not to the bulk sample. Several methods are available to make gas hydrates in the laboratory, and the method impacts the behavior of the test sample and the parameters measured. We present CT data showing hydrate saturation in samples, and thermal conductivity of laboratory-made samples estimated using the inversion code iTOUGH2 for samples with known and unknown hydrate distributions. Knowledge of the hydrate distribution greatly improves the interpretation and confidence in property measurement.

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Contents

AAPG Memoir

Natural Gas Hydrates—Energy Resource Potential and Associated Geologic Hazards

T. Collett
T. Collett
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A. Johnson
A. Johnson
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C. Knapp
C. Knapp
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R. Boswell
R. Boswell
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American Association of Petroleum Geologists
Volume
89
ISBN electronic:
9781629810270
Publication date:
January 01, 2009

GeoRef

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