SEISMIC RESOLUTION

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

THICKNESS OF WEDGE INDICATED AS A FRACTION OF DOMINANT WAVELENGTH REFLECTION FROM A WEDGE

DETECTION AND RESOLUTION OF REFLECTION FROM PINCHOUT THICKNESS OF WEDGE INDICATED AS A FRACTION OF DOMINANT WAVELENGTH DETECTABLE BUT NOT RESOLVABLE

D MIN  /4 WHERE D MIN = MINIMUM RESOLVABLE THICKNESS = DOMINANT WAVELENGTH VERTICAL RESOLUTION CRITERION

SOURCE AND DETECTOR WHERE D F = DIAMETER OF FRESNEL ZONE d = DEPTH TO REFLECTOR = DOMINANT WAVELENGTH

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

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

RELATION BETWEEN BANDWIDTH AND RESOLUTION

SOURCE AND DETECTOR WHERE D F = DIAMETER OF FRESNEL ZONE d = DEPTH TO REFLECTOR = DOMINANT WAVELENGTH

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

REFLECTIONS FROM REFLECTOR FROM MAPS WIDTH OF GAPS INDICATED IN FRENSEL ZONE DIAMETERS SEISMIC SECTION: MODEL: 2 1 1/2 1/4