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

スポンサーリンク

概要

• 論文の詳細を見る

•  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. 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. 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). 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.

• Tokyo Geographical Societyの論文

著者

• 本田 博巳

  京都大学大学院工学研究科

• 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

関連論文

• 地下の遅い流体挙動(Part 2)フィールドと室内実験からみる : イントロダクション (特集号 地下の遅い流体挙動(Part 2)フィールドと室内実験からみる)
• 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
• 秋田県中南部の女川層珪質泥岩の続成過程と物理検層解析からみた岩石物性

スポンサーリンク