132 53. Which of the following is not a geophysical surveying technique? A. Magn

Question

132 53. Which of the following is not a geophysical surveying technique? A. Magnetic. B. Gravimetric. C. Remote sensing D. Seismic. 54. All of these are geological exploration methods, EXCEPT: A. Surface mapping B. Seepage. C. Geochemical survey D. Remote sensing. 55P provides the most detail picture of subsurface traps, structural trends, and basin geometry A Seismic survey. B. Magnetic survey C. Gravimetric survey D. Electrical survey 56. Select the one which is different from the following exploration methods. A. Photogeology B. Remote sensi C. Outcrops D. Seismic 57. The speed of sound waves through the earth's crust varies A Directly with density B Directly with porosity C. Inversely with density Inversely with density and porosity 58 One of the following does not describe magnetic survey expensive way to study gross subsurface geology Measures local variations in the strength of the earth's magnetic field A. Quickest and least nables to est mate Measures vanations in the strength of gravitational field of the earth thickness of sedimentary sequence

Explanation / Answer

53. Geophysical surveying refers to the study of natural physical properties of the earth to know about the presence of hydrocarbons in the subsurface. In magnetic we study the magnetic susceptibility of the rock, in gravimetric we study the density of the rocks and in seismic we study the travel time of the seismic waves while in remote sensing we do t study any property of rock and hence C. Remote sensing is correct answer.

54. The surface mapping, seepage and remote sensing are all geological methods in which we study about the geology of the earth to know about the structures which can be used for extracting hydrocarbons and hence option C Geochemical survey is correct answer.

55. The seismic surface uses the body waves which are a class of seismic waves to know about the acoustics impedance of the formation which is then used to construct the subsurface imagining and hence option A i.e. seismic surveys provide the most detailed structure of subsurface.

56. Apart from seismic in which we use geophones also known as spikes and we put these spikes in the ground while in all the other methods we are not in the contact of the earth and hence option D is correct.

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