gas hydrate - CCOP

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20 8 10 0 6 δ13C of CO2(‰) -10 -20 -30 -40 4 2 CO2 content (%) -50 -60 2004/11/16 2004/11/29 2006/4/18 2006/4/21 2006/5/24 2006/6/20 2006/7/14 2006/8/15 2006/9/12 Injected CO2(d13C) PW-1(2004,d13C) PW-1(2006,d13C) PW-1(CH4,d13C) CO2 content(2004) CO2 content(2006) Figure 9. Monthly changes on d 13 C values and CO 2 Contents of PW-1 CBM 0 SUMMARY AND CONCLUSIONS • The CO 2 sequestration in coal seams in Japan commenced in 2002. • The field test for CO 2 injection started in 2003 with 2 wells (PW-1 and IW-1) drilled. • The geochemical monitoring of soil gas and CBM from PW-1 has been conducted by the Organic Geochemical Group of GSJ/AIST. • Gas compositions and d 13 C values were analyzed for soil gas samples collected from around IW-1 and for CBM from PW-1. • Some high CO 2 contents in soil gas are caused by CO 2 generation near the surface and not by CO 2 leakage. • The injected CO 2 from IW-1 has not reached PW-1 as shown by the fact that there is because of no continuous shift of d 13 C values observed in the CBM. New Energy Resources in the CCOP Region - Gas Hydrates and Coalbed Methane 157
Organic Geochemical Evidence for the Deep Gas Migration and Mixing with CBM at Akabira Coal Mine, Hokkaido, Japan Yuichiro Suzuki 1) , Tatsuo Maekawa 1) *, Shunichirou Igari 1) , Masami Yamaguchi 2) , Amane Waseda 3) 1) Geological Survey of Japan, AIST 2) Sumitomo Coal Mining Co. Ltd. 3) JAPEX Research Center ABSTRACT: Previous research work on CBM gas compositions at several coal mines in the Ishikari Coal-field in Hokkaido has indicated that all coal mines except the Akabira Coal Mine have more than 99.5% of methane content in total hydrocarbons. From our results, Ethane (C2) and C 3 + light hydrocarbons contents ranged from about 1% to 3% in Akabira CBM gas compositions. The 13 C carbon isotope composition of the methane indicates that the methane is thermally generated and not biogenetic. Gas compositions in each producing area in Akabira Mine show that there is a greater contribution of deep gas in western part of the mine. The geological map of the mine area indicates the presence of several faults with NNE- SSW trends. It is inferred that deep gases migrated along several of the faults and mixed with CBM in the coal seams. Keywords: CBM, Akabira, gas composition, 13 C isotope INTRODUCTION The Akabira Coal Mine, in Ishikari Coalfield, Hokkaido (Figure 1), was operated by Sumitomo Coal Mining Co. Ltd. from 1938 until it closed in 1994. The mine was well known its abundant coal mine methane gas (CMMG). It has previously been reported that the C 2 + component of the Akabira CMMG amounted to more than 1% of total hydrocarbon content (Sasaki and Nagata shown in Suzuki et al., 2002). These results were very strange when compared with CMMG from elsewhere in Ishikari Coal-field, including the Yubari and Sorachi Areas, in Hokkaido. Here we report on several samples collected from the Akabira Coal Mine area in 2003 and 2004 in order to clarify the origin of the Akabira CBM. SAMPLES Major coal seams at Akabira are of Paleogene age and comprise coal generally of bituminous rank. The general geological structure of Akabira Mine is synclinal with several faults striking NNW and dipping eastwards dip (Figure 2). CBM samples were collected at 5 localities; three from the mouths of inclined shafts and two of vertical shafts. Their names and localities are shown in Figure 2 and in Table 1. Arrows of sample localities in Figure 2 indicate the downward directions of inclined shafts. The gas sample source areas in the No.3 inclined shaft and in the Kamiuta vertical shaft are situated on the western limb of a syncline, and the others are situated on the eastern limb. New Energy Resources in the CCOP Region - Gas Hydrates and Coalbed Methane 159
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Coordinating Committee for Geoscien
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Thematic Session on New Energy Reso
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CONTENTS Page OPENING REMARKS……
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OPENING REMARKS by Chen Shik Pei Di
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WELCOME ADDRESS by Tai-Sup Lee Pres
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WELCOME ADDRESS by Keun-Pil Park Di
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CONGRATULATORY ADDRESS by David Pri
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PART I GAS HYDRATE: EXPLORATION, RE
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Partial differential equations for
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RESULTS AND DISCUSSION In the follo
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REFERENCES Berner R. A. (1980) Earl
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features of the seabed than those o
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secure the stability of the solutio
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trends depending on the following f
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Organic carbon in sediments is of i
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Sedimentological and Geochemical As
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Figure 3. Sedimentation rate of the
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Marine Gas Hydrate off W. Canada an
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Several methods for computing the Q
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0.035 0.03 Amplitude 0.025 0.02 0.0
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60 50 Amplitude 40 30 20 10 0 0 50
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REFERENCES Dallimore, S.R. and T.S.
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Frequency % 20 16 12 8 HAMA #5, MV=
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Figure 3. Experimental procedures f
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Figure 7 shows two cases of the com
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Seismic Characteristics of Gas Hydr
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Purpose The purpose of this paper i
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The dissociation zone created by th
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hydrate that forms near the wellbor
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dissociation, composite thermal con
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Figure 9. The Advanced Light Source
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Experimental Studies and Developmen
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Natural gas hydrate exploitation an
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Natural gas Free gas layer Figure 5
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Figure 7. One-dimensional developme
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Temper at ur e 2 1 0 -1 -2 -3 -4
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From the above discussion, the heat
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INTRODUCTION Clathrate hydrates are
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MATHEMATICAL MODEL The mathematical
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Where the hydrate-aqueous radius of
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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
Page 102 and 103: REFERENCES Collett, T.S. and Kuuskr
Page 104 and 105: Figure 1. Physiographic and crust m
Page 106 and 107: Figure 3. Seismic profile showing s
Page 108 and 109: Figure 7. Distribution of echo char
Page 110 and 111: Figure 10. Seismic profile and its
Page 112 and 113: In the early stage of back-arc open
Page 114 and 115: PART II COALBED METHANE (CBM)
Page 116 and 117: Supply and demand infrastructure of
Page 118 and 119: Amisan, Jogyeri, Baegunsa, and Seon
Page 120 and 121: PROPERTIES OF ANTHRACITE The coals
Page 122 and 123: Table 4. Average chemical compositi
Page 124 and 125: CONCLUSIONS 1. Most of the coals em
Page 126 and 127: INTRODUCTION Coal (total reserves 2
Page 128 and 129: ีีีีีีีีี ั ิ
Page 130 and 131: RESULTS By Government: The outcomes
Page 132 and 133: The gas composition (12 samples ana
Page 134 and 135: Table 4. Coal Depth Interval Hole N
Page 136 and 137: The results of studies made on 11 c
Page 138 and 139: CONCLUSION CBM is still hoped to be
Page 140 and 141: The Government of Indonesia through
Page 142 and 143: The Berau basin is a major coal pro
Page 144 and 145: PP: CBM - 1 Rambutan (GOI Sponsor)
Page 146 and 147: Overview of Project for CO 2 Seques
Page 148 and 149: The organic geochemistry research g
Page 150 and 151: 3.5 25 3.0 20 Ar(%) C O 2(%) 2.5 2
Page 154 and 155: Figure 1. Index map of Akabira Coal
Page 156: ORIGIN OF AKABIRA CBM In Akabira mi
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