確率論的手法による東部南海トラフのメタンハイドレート資源量評価 Resource Assessment of Methane Hydrate by Applying a Probabilistic Approach in the Eastern Nankai Trough, Japan

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 A resource assessment of methane hydrate (MH) in the eastern Nankai Trough was conducted through a probabilistic approach using 2D/3D seismic reflection data and drilling survey data obtained from Ministry of Economy, Trade and Industry (METI) Tokai-oki to Kumano-nada exploratory test wells. We extracted more than 10 prospective MH-concentrated zones characterized by high resistivity in well log, strong reflectors and high velocity on seismic profiles (data), and turbidite deposits delineated by sedimentary facies analyses.<br> The amount of methane gas contained in MH-bearing layers was calculated using a volumetric method for each zone. Each parameter, such as gross rock volume (<i>GRV</i>), net-to-gross ratio (<i>N/G</i>: ratio of sandy layer divided by gross thickness), MH pore saturation (<i>Sh</i>), porosity, cage occupancy, and volume ratio, was given as a probabilistic distribution for a Monte Carlo simulation, considering the uncertainty of these values.<br> The <i>GRV</i> of each hydrate-bearing zone was calculated from both strong seismic amplitude and velocity anomalies. The <i>N/G</i> was determined from the relationship between LWD resistivity and grain size in zones with existing wells. A seismic facies map created by a sequence stratigraphic approach was also used for determining the <i>N/G</i> in zone without well controls. <i>Sh</i> was estimated from a combination of density and NMR logs, together with calibration by gas volume measured from onboard MH dissociation tests using a pressure temperature core sampler (PTCS). <i>Sh</i> in a zone without well control was estimated from the relationship between seismic P-wave interval velocity and <i>Sh</i> from NMR log at a well site.<br> A total area of 4687 km<sup>2</sup> of Bottom Simulating Reflectors (BSRs) was interpreted within the survey area in the eastern Nankai Trough (12000 km<sup>2</sup>). The total amount of methane gas in place contained in MH in the survey area was estimated to be 40 tcf as a Pmean value (10 tcf as P90, 83 tcf as P10). Total gas in place at the MH-concentrated zone (767 km<sup>2</sup>) was estimated to be 20 tcf (Half of the total amount) as Pmean value. Sensitivity analysis indicated that <i>N/G</i> and <i>Sh</i> have higher sensitivities than other parameters.

収録刊行物

  • 地學雜誌

    地學雜誌 118(5), 814-834, 2009-10-25

    公益社団法人 東京地学協会

参考文献:  36件中 1-36件 を表示

被引用文献:  9件中 1-9件 を表示

各種コード

  • NII論文ID(NAID)
    10030366444
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    10503634
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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