Permeability differences between surface-derived and deep drillhole core samples

Details Permeability differences between surface-derived and deep drillhole core samples Permeability differences between surface-derived and deep drillhole core samples

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2151m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 19, p. 2151-2154

Other

13

Boreholes, Core Sampling, Permeability, Porosity, Transport Properties, Depth Measurement, Metamorphism (Geology), Microcracks, Plastic Deformation, Pressure Effects, Scanning Electron Microscopy, Weathering

Scientific paper

Laboratory tests reveal that the permeability of samples obtained from deep boreholes is often lower and more sensitive to pressure than the permeability of common surface-derived crystalline rocks reported in the literature. We attribute the differences in permeability behavior to the fact that surface rocks have histories of unloading, weathering and retrograde metamorphism which are not comparable to that of the deeper rocks. Weathering products that line cracks and pores of surface rocks and make these openings more difficult to close as pressure increases may account for the relatively low presure-sensitivity of permeability. Stress-relief cracking in the borehole samples can also reduce the pressure sensitivity. These results have important implications for models that incorporate assumptions about the transport properties of rock at depth, such as models of heat transport or fluid pressure buildup, because many models are based on the properties of common surface-derived rocks. Other physical properties that are controlled by cracks and pores, such as seismic velocity and electrical resistivity, may be similarly affected by differences between surface-derived and deep rocks.

Affiliated with

Also associated with

No associations

Rating

Permeability differences between surface-derived and deep drillhole core samples does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Permeability differences between surface-derived and deep drillhole core samples, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Permeability differences between surface-derived and deep drillhole core samples will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1790022