Rudra,
It has been a long while, but I remember groundwater hydrogeologists using
a ³pivot² method with both resistivity and seismic refraction to study a
granite terrane for potential resources. The pivot was a center for radial
lines of geophysics, seeking saturated fractures and depth to any
weathered surface upon bedrock.
Jeff G.
On 9/7/16, 3:11 AM, "Tectonics & structural geology discussion list on
behalf of FERNANDEZ BELLON, OSCAR" <[log in to unmask] on behalf
of [log in to unmask]> wrote:
>Hi Rudra,
>
>Work on granite/crystalline rock has been one of the keys to
>understanding fluid flow in faults and fractures (applicable to
>hydrogeology and to production of hydrocarbons). My persepective is
>inherently biased towards hydrocarbons, but the problems you face are
>similar...
>
>
>Two key references on this subject:
>
>Oda, 1985. Permeability tensor for discontinuous rock masses.
>Geotechnique, 35,483495.
>
>Barton, Zoback, Moos, 1995. Fluid flow along potentially active faults in
>crystalline rock. Geology, 23, 683-686.
>
>
>Two examples of production of fluids (hydrocarbons) from fractured
>crystalline rocks:
>
>Nelson, Moldovanyi, Matcek, Azpiritxaga, Bueno, 2000. Production
>characteristics of the fractured reservoirs of the La Paz field,
>Maracaibo bain, Venezuela. AAPG Bull, 84, 1791-1809.
>
>Cuong, Warren, 2009. Journal of Petroleum Geology, 32, 129-156.
>
>
>I am sure you can find more from the hydrogeological side of things. (And
>single-phase flow is always easier to study too!)
>
>
>Some questions that remain unanswered are:
>
>1) How fractures are distributed in granitic bodies: what controls the
>intensity and orientation of different fracture sets
>
>2) How much volume is provided by fractures for the storage of fluids in
>such rocks and how can we estimate it in a realistic manner
>
>3) Not all fractures or fractured intervals flow equally: What controls
>the productivity of individual fractures in granite bodies? What are the
>impact of fracture network connectivity, fracture aperture, ... and how
>to estimate them from limited data?
>
>
>The great thing in crystalline rock from the perspective of fluid
>dynamics is that there is no 'matrix' (continuous porous medium) in the
>equation and flow comes exclusively from fractures. This reduces the
>variables and uncertainties you need to work with and hopefully makes
>some of these issues easier to address.
>
>
>Hope this is useful for a start,
>
>oscar
>
>
>-----Mensaje original-----
>De: Tectonics & structural geology discussion list
>[mailto:[log in to unmask]] En nombre de Rudra Mohan Pradhan
>Enviado el: 06 September 2016 18:11
>Para: [log in to unmask]
>Asunto: Integrated Study on Structural Geology and Hydrogeology
>
>Dear Group members,
>I am interested to work in Integrated study of Structural Geology and
>Hydrogeology basically in Granitic terrain. Could anyone share the
>possibile work can be done with the above fields. I would be happy to
>recieve your valuable views/inputs.
>
>Thanks.
>Regards,
>Rudra M Pradhan
>Research fellow
>IIT Bombay
>
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