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)
2
Q
timeline…
hadean — Precambrian (archean and proterozoic) — Phanerozoic (paleozic, mesozoic, cenozoic)
A
slide 4 / 32 L 11
3
Q
what two well log tools were used in the correlation for the gulf of mexico?
A
GR and SP
4
Q
what are the five well log annotations?
A
baselines shapes (bell, funnel, cylinder) abrupt breaks (most important facies annotation) unusual values trends
5
Q
are abrupt breaks the most important facies annotation?
A
yes
6
Q
name the abrupt break classifications
A
--lithologically related surfaces of erosion and flooding --non lithologically related unconformities faults
7
Q
what may cause unusual values on well logs?
A
concentration of rare minerals, organic matter or phosphates