Direct Hydrocarbon Indications

Question 1

KNOW THE GRAPH
P velocity influenced by HC
AI influenced by HC

Answer 1

P =>
Gaz drop and go up
oil steady go down (linéaire almost)

AI =>
Gaz drop and go steady
oil go down (linéaire almost)

Question 2

Contact sandstone shale

with HC and water sat.

Answer 2

STRONG SOFT KICK

and under a flat event (slight hard kick with minor sag)

Question 3

Contact shale/carbonate with HC and water bearing

Answer 3

Very weak hard (or soft kick)
Flat event (with minor pull-up) under

Question 4

AI for shale, limestone and sandstone

Answer 4

++>kalkstein(with HC/Water bearing)>shale>sandstone(with HC/water sat)>–

Impédence of HC -> lower than water

so if we go gaz/oil to water=> weak hard kick

Question 5

Contact sandstone shale

with HC and water bearing

Answer 5

Polarity flip

soft kick on structure, hard kick on the rim

Question 6

effect GAZ/OIL

Answer 6

Gas gives always larger effect than oil

Question 7

POROSITY AND EFFECT

Answer 7

• The more porous the reservoir, the larger the effect