L 12 - Geology Flashcards

1
Q

what are the four types of correlation in stratigraphy?

A
lithocorrelation (litho and rock type)
bio correlation (fossil content)
event correlation (peculiar geo event)
time correlation (based on absolute time)
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2
Q

timeline…

hadean — Precambrian (archean and proterozoic) — Phanerozoic (paleozic, mesozoic, cenozoic)

A

slide 4 / 32 L 11

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3
Q

what two well log tools were used in the correlation for the gulf of mexico?

A

GR and SP

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4
Q

what are the five well log annotations?

A
baselines
shapes (bell, funnel, cylinder)
abrupt breaks (most important facies annotation)
unusual values
trends
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5
Q

are abrupt breaks the most important facies annotation?

A

yes

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6
Q

name the abrupt break classifications

A
--lithologically related
surfaces of erosion and flooding
--non lithologically related
unconformities
faults
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7
Q

what may cause unusual values on well logs?

A

concentration of rare minerals, organic matter or phosphates

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