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The reflection method comes closer than any other

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The reflection method comes closer than any other prospecting technique to providing a structural picture of the subsurface comparable to what could be obtained from a great number of boreholes in close proximity. Modern reflection record sections are similar in appearance to geologic cross sections, and geologists must sometimes be cautioned not to use them as such without taking into consideration some potential hazards that might lead to erroneous interpretation, even with good-quality reflection data. Under ideal conditions, structural relief can be determined with a precision of about ½ percent of depth below the surface. This method makes it possible to produce structural maps of any geologic horizons that yield reflections, but the horizons themselves usually cannot be identified without independent geological information such as might be obtained from wells. This method makes it possible to produce structural maps of any geologic horizons that yield reflections, but the horizons themselves usually cannot be identified without independent geological information such as might be obtained from wells. 5.0 Summary While current technological improvements have made it possible to obtain usable reflection data in many areas where reflections were formerly too poor to map, there are still places where reflection does not yield reliable information even though highly sophisticated data acquisition and processing techniques are
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44 used. In such intractable areas, other geophysical and geological methods must be employed 6.0Tutor Marked Assignment Q1.Explain the following terminologies a) Reflection Survey b) Geometric distortion in relation to reflection survey. Q2 Write short notes on the following in relation to reflection a) Spread length b) CMS - Common mid-point Shooting c) Array d) Depth Conversion 7.0References/ Further Readings Kearey, P., Brooks, M. and Hill, I. (2002) An Introduction to Geophysical Exploration (Third Edition), Blackwell Science, Oxford, 262 pp. John, M. (2003) Field Geophysics (Third Edition). John Wiley and Sons Ltd. England, 249pp McCann, D.M., Fenning, P. and Cripps, J. (Eds) (1995) Modern Geophysics in Engineering Geology, Engineering Group of the Geological Society, London, 519 pp. Mussett, A.E. and Khan, M.A. (2000) Looking into the Earth: An Introduction to Geological Geophysics, Cambridge University Press, Cambridge, 470 pp. Parasnis, D.S. (1996) Principles of Applied Geophysics (Fifth Edition Chapman & Hall, London, 456 pp. Reynolds, J.M. (1997) An Introduction to Applied and Environmental Geophysics, Wiley, Chichester, 796 pp. Sharma, P.V. (1997) Environmental and Engineering Geophysics, Cambridge University Press, Cambridge, 475 pp. Telford, W.M., Geldart, L.P., Sheriff, R.E. and Keys, D.A.
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The reflection method comes closer than any other...

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