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Coal Exploration Techniques

An introduction into the techniques used for subsurface exploration and delineation of coal deposits.

Micheal Moroskat

on 10 May 2011

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Transcript of Coal Exploration Techniques

Gamma Ray Density Neutron Resistivity Sonic Caliper Summary Example Wireline Geophysical Logs Seismic Reflection Measures naturally occurring radiation Good quality coals have low radiation Must use with other logs to distiquish coal Coal has uniquely low density 2 detectors measure gamma rays passed into formation and reflected back to source must use with caliper log measures the hydrogen content source is high energy neutrons detects reflected low energy neutrons coal has high count lignite and anthracite = sub-bituminous and bituminous = low res. low-high res. sends out sounds waves interprets velocity in different rock types coal has high reading measures the width of the borehole used with density to indicate rock strength used to correct density minable coal <1.5 km deep seismic surveys can be shallow and high resolution high resolution and high contrast in acoustic impedance = reslolution of thin coal seams identification of faults, folds, washouts, seam splits, etc. = SEISMIC VELOCITY x DENSITY Geophysical Properties of Coal low density
low seismic velocity
low magnetic susceptibility
high resistivity
low radioactivity other geophysical techniques Gravity Magnetics electrical identification of coal bearing sedimentary basins concealed by younger strata provides information on the structure of the basins used to delineate the broad structural framework of a coal-bearing area locate sedimentary sequences likely to host coal at an accessible depth has been used to locate coal (e.g. Wyoming, Australia) identify seam splitting find old coal mine shafts (e.g. UK)
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