By P. K. Harvey, T. S. Brewer, P. A. Pezard, V. A. Petrov
Boreholes are as a rule drilled into crystalline rocks to judge their suitability for numerous functions comparable to waste disposal (including nuclear waste), geothermal strength, hydrology, sequestration of greenhouse gases and for fault research. Crystalline rocks contain igneous, metamorphic or even a few sedimentary rocks. The quantification and realizing of person rock lots calls for broad modelling and an research of assorted actual and chemical parameters. This quantity covers the subsequent elements of the petrophysical homes of crystalline rocks: fracturing and deformation, oceanic basement reports, permeability and hydrology and laboratory-based experiences. With the starting to be calls for for sustainable and environmentally potent improvement of the subsurface, the petrophysics of crystalline rocks is changing into an more and more vital field.Also to be had: functions of X-ray Computed Tomography within the Geosciences - ISBN 1862391394 Hydrocarbons in Crystalline Rocks - ISBN 1862391378 Fracture And In-situ rigidity Characterisation of Hydrocarbon Reservoirs - ISBN 1862391300
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Extra info for Petrophysical Properties of Crystalline Rocks (Geological Society Special Publication No. 240)
1970. Formation evaluation by inspection with the borehole televiewer. Geophysics, 35, 254-269. Scale dependence of hydraulic and structural parameters in fractured rock, from borehole data (KTB and HSDP) G. Z I M M E R M A N N 1, H. B U R K H A R D T 2 & L. de ) 2Department of Applied Geophysics, Ackerstr. 76, D-13355 Berlin, Germany 3Institute of Geophysics and Meteorology, Mendelssohnstr. 3, 38106 Braunschweig, Germany Abstract: Fundamental understanding of the origin, geometry, extension and scale dependence of fluid pathways in fractured rock is still incomplete.
Com) Abstract: This investigation of naturally occurring fractures in the mafic rocks of the Palisades dolerite sill characterizes the porosity of this crystalline rock sequence, and yields a method of determining the in situ porosity when complete down-hole information is not available. Two holes, 229 m and 305 m deep, were drilled 450 m apart through the sill and into the underlying Triassic sediments of the Newark Basin. Both holes were logged with geophysical tools, including the acoustic borehole televiewer (BHTV), to identify intervals of high porosity, fracturing, and potential zones of active fluid flow.
This decrease of Vp is continuous and independent of the observed fluctuations in the EDZ. The tomographic model for Vs is shown in Figure 7b. The distribution of high- and lowvelocity zones in the EDZ is in good agreement with that of Vp (cf. Fig. 7a). In the deeper interior of the rock mass, Vs also decreases as the cataclastic zone at Tm 973 is approached, whereby the reduction of Vs is stronger than that of Vp. 9 in Figure 7c. 6 is seen in the first 2 to 3 m distance from the tunnel '-uartz l e n s laminated gneiss 840 (schistosity) 21 wall.