Flowing fluid electric conductivity logging for a deep artesian well in fractured rock with regional flow

Doughty, C.*; Tsang, C.-F.*; Yabuuchi, Satoshi; Kunimaru, Takanori

To improve the field method to provide heterogenety data for modeling of solute transport in complex fractured rock, the analysis of the flowing fluid electric conductivity(FFEC) logging was examined. FFEC logging was conducted in the pilot borehole in fractured sedimentary rock in Japan as part of the Horonobe Underground Research Laboratory Project. FFEC logs were collected under unpumped conditions and at two different pumping rates, nominally 8L/min and 16L/min. Though the data have a number of complications, the analysis was successful to identify 17 hydraulically conducting fractures, and to estimate their hydraulic transimissivities, inherent pressure heads and salinities (in terms of fluid electric conductivities). The results are confirmed in comparison with hydraulic packer tests and hydrochemical data.