lecutre 5 Flashcards

1
Q

what are the 3 types of geophysical exploration

A

magnetic, seismic, gravity

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2
Q

what is the name of the device used in magnetic geophysical exploration

A

magnomitor

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3
Q

what is the name of the device used in gravity geophysical exploration

A

gravimeter

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4
Q

how does the gravity anomoly show up at a reef

A

high - low

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5
Q

magnetic and graivity geophysical readings are defined by what critque

A

low resolution

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6
Q

another name for a vibrator used on land in seisimc is…

A

vibroseis

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7
Q

what is the name of the vibraror used in seismic at sea

A

air gun

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8
Q

what is the name of the seismic receiver used during seimic imaging on land

A

geophone

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9
Q

what is the name of the seismic receiver used during seimic imaging at sea

A

hydrophone

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10
Q

what is the name of a group of seismic receivers

A

array

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11
Q

what are the three stages of seimic survey

A

acquisition, processing, interpretation

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12
Q

what is a seismic trace

A

data gathered by one shot of a seismic wave

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13
Q

what is a seismic profile

A

combination of seismic traces representing a cross section of subsurface structures

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14
Q

what is a variable densitity display

A

represents seismic energy amplitude

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15
Q

what is deconvolution

A

inverse filtering, processing combining the seismic energy spread out across the sub surface

pulse is natural spread out

pulse is filtered by different density rock layers

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16
Q

what is geophysical imaging “migration”

A

a mathematical process to reconstruct the the reflector geometry from the reflected seismic energy

geometrical relocation needed because of reflections

17
Q

what is the bow tie effect

A

reflections occcuring from both sides of a syncline

reflections arrive at receiver at different times