By Gijs J. O. Vermeer

Because the first variation of 3D Seismic Survey layout seemed in 2002, seismic facts acquisition has visible many alterations, such a lot of that have been captured during this moment version. This publication by means of Gijs Vermeer describes intimately the homes of 3D acquisition geometries and exhibits how those homes clearly bring about the 3D symmetric sampling method of 3D survey layout. Many examples from the literature are used to demonstrate reliable and not more stable offerings of acquisition parameters. The hyperlink among survey parameters and noise suppression in addition to imaging is an intrinsic a part of the contents. This booklet might be of serious curiosity to the fashion designer of 3D seismic surveys, but in addition to each geophysicist who makes use of 3D seismic facts to retrieve actual details at the homes of the subsurface.

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Extra info for 3-D Seismic Survey Design, 2nd Edition (Geophysical References)

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Bureau of Mines contract No. H0230023. NTIS No. PB277987/AS. –METHANE CONTROL AT CONTINUOUS MINER SECTIONS By Fred N. ,1 Charles D. Taylor,2 and Gerrit V. R. 3 In This Chapter 9 Methane emission peaks 9 Exhaust line curtain or duct 9 The spray fan system 9 Dust scrubbers with blowing ventilation 9 Dust scrubbers with exhaust ventilation 9 The ventilation of abnormally gassy faces 9 Methane detection at continuous miner faces 9 Ventilation and methane detection at bolter faces and 9 Reducing frictional ignitions This chapter gives guidelines for preventing methane gas explosions at continuous miner sec­ tions in coal mines, both at continuous miners and at roof bolters.

This chapter uses the term “restricted space” because it is a more appropriate distinction for mining applications. The more common “confined space” term is not used because the whole mine can be regarded as a confined space. Further, none of these special terms do a good job of describing measurements at coal mine gobs, a specialized topic not considered in this chapter. 10 For example, a restricted-space methane explosion occurred in January 2003, killing three workers during a shaft- sinking operation at a coal mine near Cameron, WV.

Spray fan system on a continuous miner. The numbers correspond to the spray manifolds. In addition to the spray manifolds already described, additional dust suppression spray manifolds 5, 6, and 7 are directed at the ends of the cutting head and into the throat. These also help to keep the cutter head ends and the throat clear of gas, and they operate whether the leftor right-side curtain is in use. —Methane dilution capacity of the spray fan system. The methane dilution perform­ ance of the spray fan is shown in Figure 3–6.

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