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- 本田 博巳
- 京都大学大学院工学系研究科都市社会工学専攻ジオマネージメント講座環境資源システム工学研究室
書誌事項
- タイトル別名
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- Evaluation of Average Flow Rate of Subsurface Fluid Based on an Inclined Gas/Water Contact in the Peciko Gas Field, Mahakam Delta Province, East Kalimantan, Indonesia
- マハカムデルタ チイキ ・ ペチコガスデン デ ノ ケイシャ ガス/ミズ セッショクメン ニ モトズク チカ リュウタイ リュウドウ ノ ヘイキンテキ リュウソク ヒョウカ
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The purpose of this study is to estimate the average flow rate of subsurface formation water through an overpressured reservoir in a significant gas field.<br> Oil (or gas)/water contact in a field can be recognized as a representation of the hydraulic potential surface. Gradient of the potential surface is equivalent to hydraulic gradient in Darcy equation for steady flow of fluidal continuum. Supposing or sampling data of hydraulic coefficient (well data, etc.), therefore, flow rate can be calculated based on Darcy equation.<br> Inclined oil (or gas)/water contacts have been discovered in many fields around the world to date. A hydrodynamic theory has been proposed to explain the physical mechanism of inclined contacts (Hubbert, 1953). Peciko gas field in the Mahakam Delta Province, East Kalimantan, Indonesia gives a typical example of inclined contact. The hydraulic gradient governing the Peciko gas field is caused by the hydraulic gradient between its adjacent hydrostatic domain and a highly over-pressured domain. The present average flow rate in the gas zone is estimated to be 3.1 mm/year. This value is less than 2.5 cm/year of subsurface fluid migration in the North Sea estimated by England et al. (1987).<br> The size of a water molecule (2.1 × 10-10 m) indicates that the slow flow means almost no flow on average. Considering that gas accumulation in the Peciko gas field plugs the paths of fluid migration over the field, the present fluid flow averaged over the field should be less than the normal water saturated environment. Under some assumptions, the flow rate would be 3.1 mm/year; this estimate is consistent when averaging those of sandstone and mudstone.
収録刊行物
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- 地学雑誌
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地学雑誌 122 (1), 34-68, 2013
公益社団法人 東京地学協会
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詳細情報 詳細情報について
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- CRID
- 1390282679214036608
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- NII論文ID
- 130003385922
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- NII書誌ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL書誌ID
- 024346518
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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