Open AccessEstimating the crust permeability from fluid‐injection‐induced seismic emission at the KTB site
Author(s) -
Shapiro Sergei A.,
Huenges Ernst,
Borm Günter
Publication year - 1997
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1997.tb01215.x
Subject(s) - geology , borehole , crust , permeability (electromagnetism) , microseism , drilling , continental crust , seismology , hydraulic fracturing , petrology , geophysics , geotechnical engineering , materials science , membrane , biology , genetics , metallurgy
SUMMARY During the hydraulic‐fracturing experiment in the German Continental Deep Drilling Borehole (KTB) in December 1994, microseismic activity was induced. Here we develop a technique for estimating permeability using the spatio‐temporal distribution of the fluid‐injection‐induced seismic emission. The values we have obtained for the KTB experiment (0.25times10 ‐16 to 1.0times10 ‐16 1.0times10 ‐16 m 2 ) are in a very good agreement with the previous hydraulic‐type permeability estimates from KTB deep‐observatory studies. In addition, our estimates of the hydraulic diffusivity support the previously calculated value for the upper crust, which is of the order of 1 m 2 s ‐1 . However, this estimate now relates to the depth range 7.5‐9 km.