Application of direct-fitting, mass integral, and multirate methods to analysis of flowing fluid electric conductivity logs from Horonobe, Japan

流体電気伝導度検層手法の幌延における適用

Doughty, C.*; Tsang, C.-F.*; 畑中 耕一郎; 藪内 聡; 操上 広志  

Doughty, C.*; Tsang, C.-F.*; Hatanaka, Koichiro; Yabuuchi, Satoshi; Kurikami, Hiroshi

流体電気伝導度検層を幌延の深層ボーリング孔において適用した。その結果、幌延に存在する塩水系地下水に対しては、淡水系の井戸水で孔内水を置換することにより、水理特性の解析に有効なデータが取得できることがわかった。

The flowing fluid electric conductivity (FFEC) logging method is an efficient way to provide information on the depths, salinities, and inflow strengths of individual conductive features intercepted by a borehole, without the use of specialized probes. The present paper presents the application of the method to two zones within a 1000-m borehole in sedimentary rock, which produced, for each zone, three sets of logs at different pumping rates, each set measured over a period of about one day.