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Published byGerald Summers Modified over 9 years ago
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SEISMIC RESOLUTION
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NORMAL-INCIDENCE REFLECTION AND TRANSMISSION COEFFICIENTS WHERE: 1 = DENSITY OF LAYER 1 V 1 = VELOCITY OF LAYER 1 2 = DENSITY OF LAYER 2 V 2 = VELOCITY OF LAYER 2 DENSITY 1 VELOCITY V 1 DENSITY 2 VELOCITY V 2 REFLECTION COEFFICIENT TRANSMISSION COEFFICIENT
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THICKNESS OF WEDGE INDICATED AS A FRACTION OF DOMINANT WAVELENGTH REFLECTION FROM A WEDGE
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DETECTION AND RESOLUTION OF REFLECTION FROM PINCHOUT THICKNESS OF WEDGE INDICATED AS A FRACTION OF DOMINANT WAVELENGTH DETECTABLE BUT NOT RESOLVABLE
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D MIN /4 WHERE D MIN = MINIMUM RESOLVABLE THICKNESS = DOMINANT WAVELENGTH VERTICAL RESOLUTION CRITERION
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SOURCE AND DETECTOR WHERE D F = DIAMETER OF FRESNEL ZONE d = DEPTH TO REFLECTOR = DOMINANT WAVELENGTH
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SIZE OF FRESNEL ZONE IF << d AND WHERE V AVG = AVERAGE VELOCITY TO REFLECTOR V INT = INTERVAL VELOCITY TO REFLECTOR t = TWO-WAY ARRIVAL TIME f = DOMINANT FREQUENCY OF PULSE
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VERTICAL RESOLUTION AND BANDWIDTH MORE PROPERLY, T MIN 1 /(2B) WHERE T MIN = MINIMUM RESOLVABLE THICKNESS B = BANDWIDTH OF THE PULSE THUS, RESOLUTION IS FUNCTION OF BANDWIDTH, NOT OF HIGHEST FREQUENCY COMPONENT
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RELATION BETWEEN BANDWIDTH AND RESOLUTION
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SOURCE AND DETECTOR WHERE D F = DIAMETER OF FRESNEL ZONE d = DEPTH TO REFLECTOR = DOMINANT WAVELENGTH
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SIZE OF FRESNEL ZONE IF << d AND WHERE V AVG = AVERAGE VELOCITY TO REFLECTOR V INT = INTERVAL VELOCITY TO REFLECTOR t = TWO-WAY ARRIVAL TIME f = DOMINANT FREQUENCY OF PULSE
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REFLECTIONS FROM REFLECTOR FROM MAPS WIDTH OF GAPS INDICATED IN FRENSEL ZONE DIAMETERS SEISMIC SECTION: MODEL: 2 1 1/2 1/4
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