gas hydrate - CCOP

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Figure 3. Sedimentation rate of the Ulleung Basin, ODP, and DSDP cores. The sedimentation rate of the 2005 cores showed a variation from 60 m/10 6 year to 280 m/10 6 year (Figure 3). As the sedimentation rate should be higher than 30 m/10 6 year to form gas hydrate (Sloan, 1998), these sedimentation rates are sufficient for the formation of gas hydrate. Geographical variations of methane sensing data showed normal concentration whereas GH06-02B data were higher the other sites (Figure 4). Figure 4. Vertical variation of methane concentration by METS methane sensor. The Ulleung Basin is characteristically a Tertiary back-arc basin with highest sedimentation rate among the East Sea (Japan Sea) basins. The Ulleung Basin shows good indicators of gas hydrate potential. These indicators include high sedimentation rate, enough organic matters, high HC values, degassing cracks, tube worms, and gas seepage structures. This raises the question as to why gas hydrate samples have not been discovered in the Ulleung Basin, even though 44 piston cores have been acquired. This may partly be due to the sporadic distribution of gas hydrate and positioning problems for geographically precise sampling under the sea. REFERENCES Kvenvolden, K.A. and Lorenson, T.D., 2001, Natural Gas Hydrates, Occurrence, Distribution, and Detection, 3-18. Sloan, E.D., 1998, Clathrate Hydrate of Natural Gas (2 nd edition). Marcel Dekker, New York, 705. New Energy Resources in the CCOP Region - Gas Hydrates and Coalbed Methane 29
A Brief Summary of Deep Drilling and Core Analysis for Gas Hydrate Research and Development in Prospect Region I, East Sea, Korea J.H. Jin, Y.K. Kwon, J.J. Bahk, J.H. Kim, Y.J. Lee, S.I. Nam, S.W. Chang, D.G. Yoo, J.H. Lee, G.S. Kong, I.K. Um, H.Y. Lee and K.P. Park Korea Institute of Geoscience and Mineral Resources, 30, Gajeong-dong, Yusung-ku, Daejon 305-350, Korea SUMMARY A total of five long (> tens of meters) sediment cores were retrieved from Prospect Region I, East Sea, as part of gas hydrate research and development activities by the Korea Institute of Geoscience and Mineral Resources (KIGAM) in 2005. Methane–gas sensing was carried out simultaneously with drilling. With no distinct occurrence of gas hydrates to the greatest drill depth (ca 40 m), there is, however, a clear trend of exponentially increasing methane gas concentration with increasing depth from surface (from 10 3 nmol/l to more than 10 5 nmol/l). Laboratory core analyses show that the drilled substratum is dominated by muddy facies with minor intercalations of sandy facies increasing downwards. Porosity of the muddy sediments ranges from almost 100% at the top to as low as 50% at the bottom, decreasing downwards with decreasing water content. Based on radiocarbon dates, sedimentation rates are measured as 10 -1 mm/year. The sediments appear almost impermeable, being 0.187 md under given overburden pressure of 116 psi. Based on pore water analyses, the sulfate–methane interface develops at 5 to 17 m below the seafloor. No significant changes of Br - and Cl - concentrations and δD and δ 18 O values in pore water were found throughout the subsurface depths, suggesting that the lack of gas hydrate is not due to dissociation during drilling and sample recovery but is rather due to the initial poor conditions for its development and preservation. Along with a downward increase in the ratio of ethane to methane in void gases, δ 13 C value also becomes heavier to the same direction, implying the possible contribution of thermogenic gases from deeper substratum. All these analytical results suggest that much better conditions for gas hydrate development and preservation may be encountered in the deeper substratum. New Energy Resources in the CCOP Region - Gas Hydrates and Coalbed Methane 31
Page 2 and 3: Coordinating Committee for Geoscien
Page 4 and 5: Thematic Session on New Energy Reso
Page 6 and 7: CONTENTS Page OPENING REMARKS……
Page 8 and 9: OPENING REMARKS by Chen Shik Pei Di
Page 10 and 11: WELCOME ADDRESS by Tai-Sup Lee Pres
Page 12 and 13: WELCOME ADDRESS by Keun-Pil Park Di
Page 14 and 15: CONGRATULATORY ADDRESS by David Pri
Page 16 and 17: PART I GAS HYDRATE: EXPLORATION, RE
Page 18 and 19: Partial differential equations for
Page 20 and 21: RESULTS AND DISCUSSION In the follo
Page 22 and 23: REFERENCES Berner R. A. (1980) Earl
Page 24 and 25: features of the seabed than those o
Page 26 and 27: secure the stability of the solutio
Page 28 and 29: trends depending on the following f
Page 30 and 31: Organic carbon in sediments is of i
Page 32 and 33: Sedimentological and Geochemical As
Page 36 and 37: Marine Gas Hydrate off W. Canada an
Page 38 and 39: Several methods for computing the Q
Page 40 and 41: 0.035 0.03 Amplitude 0.025 0.02 0.0
Page 42 and 43: 60 50 Amplitude 40 30 20 10 0 0 50
Page 44 and 45: REFERENCES Dallimore, S.R. and T.S.
Page 46 and 47: Frequency % 20 16 12 8 HAMA #5, MV=
Page 48 and 49: Figure 3. Experimental procedures f
Page 50 and 51: Figure 7 shows two cases of the com
Page 52 and 53: Seismic Characteristics of Gas Hydr
Page 54 and 55: Purpose The purpose of this paper i
Page 56 and 57: The dissociation zone created by th
Page 58 and 59: hydrate that forms near the wellbor
Page 60 and 61: dissociation, composite thermal con
Page 62 and 63: Figure 9. The Advanced Light Source
Page 64 and 65: Experimental Studies and Developmen
Page 66 and 67: Natural gas hydrate exploitation an
Page 68 and 69: Natural gas Free gas layer Figure 5
Page 70 and 71: Figure 7. One-dimensional developme
Page 72 and 73: Temper at ur e 2 1 0 -1 -2 -3 -4
Page 74 and 75: From the above discussion, the heat
Page 76 and 77: INTRODUCTION Clathrate hydrates are
Page 78 and 79: MATHEMATICAL MODEL The mathematical
Page 80 and 81: Where the hydrate-aqueous radius of
Page 82 and 83: REFERENCES Brooks, R.H., and A.T. C
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86 New Energy Resources in the CCOP
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In this paper, an overview of the M
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The brief tasks in the Phase I are:
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In "Development of the dissociation
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Figure 5. Preparation equipment. AN
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Other recent research subjects in t
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same crystalline structure directly
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Another important aspect of the pre
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a + CO 2 CH 4 C 2 H 6 b CH 4 in sII
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REFERENCES Collett, T.S. and Kuuskr
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Figure 1. Physiographic and crust m
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Figure 3. Seismic profile showing s
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Figure 7. Distribution of echo char
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Figure 10. Seismic profile and its
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In the early stage of back-arc open
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PART II COALBED METHANE (CBM)
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Supply and demand infrastructure of
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Amisan, Jogyeri, Baegunsa, and Seon
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PROPERTIES OF ANTHRACITE The coals
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Table 4. Average chemical compositi
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CONCLUSIONS 1. Most of the coals em
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INTRODUCTION Coal (total reserves 2
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RESULTS By Government: The outcomes
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The gas composition (12 samples ana
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Table 4. Coal Depth Interval Hole N
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The results of studies made on 11 c
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CONCLUSION CBM is still hoped to be
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The Government of Indonesia through
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The Berau basin is a major coal pro
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PP: CBM - 1 Rambutan (GOI Sponsor)
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Overview of Project for CO 2 Seques
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The organic geochemistry research g
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3.5 25 3.0 20 Ar(%) C O 2(%) 2.5 2
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20 8 10 0 6 δ13C of CO2(‰) -10 -
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Figure 1. Index map of Akabira Coal
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ORIGIN OF AKABIRA CBM In Akabira mi
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