L 12 - Geology

Question 1

what are the four types of correlation in stratigraphy?

Answer 1

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

Question 2

timeline…

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

Answer 2

slide 4 / 32 L 11

Question 3

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

Answer 3

GR and SP

Question 4

what are the five well log annotations?

Answer 4

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

Question 5

are abrupt breaks the most important facies annotation?

Answer 5

yes

Question 6

name the abrupt break classifications

Answer 6

--lithologically related
surfaces of erosion and flooding
--non lithologically related
unconformities
faults

Question 7

what may cause unusual values on well logs?

Answer 7

concentration of rare minerals, organic matter or phosphates