珪質岩（珪藻質堆積物）の続成作用と炭化水素の移動・集積

• 辻 隆司

  石油資源開発株式会社技術本部技術研究所

• 早稲田 周

  石油資源開発株式会社技術本部技術研究所

• 横井 悟

  石油資源開発株式会社国内事業本部

書誌事項

タイトル別名

• Burial Diagenesis of Diatomaceous Deposits and Its Effects on Hydrocarbon Accumulation
• ケイシツガン(ケイソウシツ タイセキブツ)ノ ゾクセイサヨウ ト タンカスイソ ノ イドウ ・ シュウセキ

抄録

 Silica mineral phase transformations in addition to mechanical compaction and cementation, affect burial diagenetic processes in diatomaceous sediments. Thus, the porosity and/or permeability of siliceous sediments abruptly change with the transformations. Among these diagenetic changes, the transformation from opal-CT to quartz is the most important process in petroleum geology. In this transformation process, permeability improves due to the improvement of pore connectivity induced by the net-like development of new pores. If enough silica is supplied during the process, the silica attaches selectively to portions with high permeability. In this process, the formation of chert just below the transformation boundary is possible. Chert is the most brittle of siliceous rocks and is capable of forming fractured reservoirs. If insufficient silica is supplied, quartz porcelanite with a low clay content shows high reservoir quality within the one-thousand meter interval below the transformation depth. If a clay-rich layer is interbedded in that interval, mechanical compaction progresses selectively in the layer. As a result, opal-CT porcelanite directly above the transformation boundary and clay-rich quartz porcelanite layer below the boundary seal hydrocarbons that have migrated from deeper zones. Meanwhile, if the basin uplifts and the transformation depth becomes shallower than about 500 meters, the permeability of opal-CT porcelanite above the transformation boundary could be as high as the permeability of the quartz porcelanite below it. In that case, opal-CT porcelanite directly above the transformation boundary does not provide an effective seal.

収録刊行物

• 地学雑誌

  地学雑誌 122 (1), 69-89, 2013

  公益社団法人 東京地学協会

キーワード

• 珪質岩
• ポーセラナイト
• チャート
• 生物源シリカ
• 続成転移
• 孔隙率
• 浸透率
• 炭化水素
• トラップ
• 貯留層
• シール

詳細情報

• CRID: 1390001204237326720
• NII論文ID: 130003385923
• NII書誌ID: AN00322536
• DOI: 10.5026/jgeography.122.69
• COI: 1:CAS:528:DC%2BC3sXhtFaqt77I
• ISSN: 18840884
• ISSN: 0022135X
• NDL書誌ID: 024346526
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024346526
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可