Earth & Environmental Sciences
geological time
100%
Cretaceous
59%
hydrocarbon generation
58%
hydrocarbon migration
53%
modeling
52%
Central Africa
51%
starvation
50%
basin
46%
anticline
45%
biosphere
42%
petroleum
35%
village
35%
limestone
32%
seepage
30%
Triassic
26%
rifting
24%
oil
24%
source rock
23%
hydrocarbon
23%
cap rock
21%
vitrinite
20%
mudstone
19%
well
18%
Paleocene
17%
material
16%
heat flow
16%
history
16%
shale
16%
Eocene
14%
cell
14%
kerogen
14%
gas
12%
methane
12%
planktonic foraminifera
12%
microfossil
11%
oil exploration
11%
basin fill
10%
index
10%
vitrinite reflectance
9%
biomarker
9%
Aptian
9%
dolomite
9%
field study
9%
outcrop
9%
total organic carbon
8%
exhumation
8%
Jurassic
8%
sealing
8%
rate
8%
oil field
7%
Physics & Astronomy
Sudan
71%
hydrocarbons
39%
rocks
33%
oils
25%
traps
20%
expulsion
18%
heat transmission
15%
caps
14%
kerogen
11%
subsidence
11%
histories
11%
oil fields
11%
gases
7%
erosion
6%
beds
6%
computer programs
5%