The AD Scientific Index (Alper-Doger Scientific Index) provides the most comprehensive analysis across 13 main fields and 197 sub-branches at global, national, and regional levels. These analyses are based on indicators such as the H-index, i10-index, and citation count, including their values from the last 6 years. As of Jan 30, 2025, the rankings are determined according to the Total H Index. BETA VERSION: The subject field rankings for the world, regions, countries, and universities are currently in their Beta phase. This is due to the exclusion of (873.690) scientists categorized under ‘Others’, whose profiles have yet to be determined, edited, or classified. As updates are made to these fields, the rankings will be adjusted accordingly. Note: Please keep this in mind while reviewing the rankings. For further details, explore our [University Subject Rankings].
* Total H IndexRankings
Ranking Based On Selection: 1
Geochemistry
igneous petrology
platinum group element geochemistry
Re-Os isotopes
Molecular
Metrics
H-Index
i10 Index
Citation Counts
88
346
28,444
* Total H IndexRankings
Ranking Based On Selection: 2
Petroleum Microbiology
Sulfate-reducing bacteria
Metrics
H-Index
i10 Index
Citation Counts
74
214
17,006
* Total H IndexRankings
Ranking Based On Selection: 3
heavy oil
interfacial science
chemical reactors
biochemical reactors
Metrics
H-Index
i10 Index
Citation Counts
71
250
15,921
* Total H IndexRankings
Ranking Based On Selection: 4
igneous petrology
geochemistry
Metrics
H-Index
i10 Index
Citation Counts
50
72
11,156
* Total H IndexRankings
Ranking Based On Selection: 5
Ore Deposits
Igneous Geochemistry
Igneous Petrology
Metrics
H-Index
i10 Index
Citation Counts
47
87
10,845
* Total H IndexRankings
Ranking Based On Selection: 6
Petroleum engineering
Metrics
H-Index
i10 Index
Citation Counts
45
121
7,095
* Total H IndexRankings
Ranking Based On Selection: 7
Statistical Thermodynamics
Interfacial Physics
Molecular Modeling and Simulation
Metrics
H-Index
i10 Index
Citation Counts
43
97
6,417
* Total H IndexRankings
Ranking Based On Selection: 8
Precambrian
petrology
Metrics
H-Index
i10 Index
Citation Counts
43
111
6,732
* Total H IndexRankings
Ranking Based On Selection: 9
Experimental petrology
planetary volatiles
Metrics
H-Index
i10 Index
Citation Counts
38
46
5,491
* Total H IndexRankings
Ranking Based On Selection: 10
Petroleum Engineering
Metrics
H-Index
i10 Index
Citation Counts
37
114
4,811
* Total H IndexRankings
Ranking Based On Selection: 11
Interwell connectivity
petrophysics
Metrics
H-Index
i10 Index
Citation Counts
37
75
5,657
* Total H IndexRankings
Ranking Based On Selection: 12
Petroleum Engineering
Metrics
H-Index
i10 Index
Citation Counts
35
91
4,280
* Total H IndexRankings
Ranking Based On Selection: 13
diamond
diamond inclusions
mantle petrology
mantle xenoliths
kimberlite petrology
Metrics
H-Index
i10 Index
Citation Counts
35
73
5,221
* Total H IndexRankings
Ranking Based On Selection: 14
reservoir engineering
machine learning
unconventional reservoir development
simulation and optimization
Metrics
H-Index
i10 Index
Citation Counts
32
93
3,248
* Total H IndexRankings
Ranking Based On Selection: 15
petroleum engineering
enhanced oil recovery
chemical engineering
Metrics
H-Index
i10 Index
Citation Counts
31
96
3,880
* Total H IndexRankings
Ranking Based On Selection: 16
tectonics
igneous petrology
geochemistry
isotope geochemistry
Precambrian geology
Metrics
H-Index
i10 Index
Citation Counts
29
75
3,452
* Total H IndexRankings
Ranking Based On Selection: 17
Unconvetional oil/gas
Geological CO2 sequestration
Subsurface H2 storage
Li-rich brines
Metrics
H-Index
i10 Index
Citation Counts
28
50
4,852
* Total H IndexRankings
Ranking Based On Selection: 18
Porous Media
Interfacial Flows
Hydrodynamic Stability
Fluid Mechanics
Petroleum Engineering
Metrics
H-Index
i10 Index
Citation Counts
28
63
2,577
* Total H IndexRankings
Ranking Based On Selection: 19
Microplastics
Sedimentary Petrology
Metrics
H-Index
i10 Index
Citation Counts
28
49
6,812
* Total H IndexRankings
Ranking Based On Selection: 20
Petrology
Geochemistry
Diamond
Porphyry
Metrics
H-Index
i10 Index
Citation Counts
23
33
3,334
* Total H IndexRankings
Ranking Based On Selection: 21
Mantle Petrology
Carbon Cycle
Diamonds
Kimberlites
Amber
Metrics
H-Index
i10 Index
Citation Counts
21
28
2,159
* Total H IndexRankings
Ranking Based On Selection: 22
Isotope geology and geochronology
petrology
field geology
geoscience education
Metrics
H-Index
i10 Index
Citation Counts
20
34
1,451
* Total H IndexRankings
Ranking Based On Selection: 23
Reservoir Characterization
Rate-Transient Analysis (RTA)
Pressure-Transient Analysis (PTA)
Modeling
Reserves Evaluations
Metrics
H-Index
i10 Index
Citation Counts
19
24
1,241
* Total H IndexRankings
Ranking Based On Selection: 24
Petroleum Engineering
Metrics
H-Index
i10 Index
Citation Counts
19
40
1,104
* Total H IndexRankings
Ranking Based On Selection: 25
Reservoir Characterization
Metrics
H-Index
i10 Index
Citation Counts
18
39
1,894
DG Pearson
University of Alberta
Edmonton, Canada
Metrics
H-Index
i10-Index
Citation Counts
88
346
28,444
Geochemistry
igneous petrology
platinum group element geochemistry
Re-Os isotopes
Molecular
Gerrit Voordouw
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
74
214
17,006
Petroleum Microbiology
Sulfate-reducing bacteria
Murray Gray
University of Alberta
Edmonton, Canada
Metrics
H-Index
i10-Index
Citation Counts
71
250
15,921
heavy oil
interfacial science
chemical reactors
biochemical reactors
George Jenner
Memorial University of Newfoundland
St John’s, Canada
Metrics
H-Index
i10-Index
Citation Counts
50
72
11,156
igneous petrology
geochemistry
C Michael Lesher
Université Laurentienne
Sudbury, Canada
Metrics
H-Index
i10-Index
Citation Counts
47
87
10,845
Ore Deposits
Igneous Geochemistry
Igneous Petrology
Roberto Aguilera
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
45
121
7,095
Petroleum engineering
Zhehui Jin
University of Alberta
Edmonton, Canada
Metrics
H-Index
i10-Index
Citation Counts
43
97
6,417
Statistical Thermodynamics
Interfacial Physics
Molecular Modeling and Simulation
John A Percival
Natural Resource Canada
Ottawa, Canada
Metrics
H-Index
i10-Index
Citation Counts
43
111
6,732
Precambrian
petrology
Tony Withers
Western University Canada
London, Canada
Metrics
H-Index
i10-Index
Citation Counts
38
46
5,491
Experimental petrology
planetary volatiles
Fanhuabill Zeng
University of Regina
Regina, Canada
Metrics
H-Index
i10-Index
Citation Counts
37
114
4,811
Petroleum Engineering
Jerry Jensen
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
37
75
5,657
Interwell connectivity
petrophysics
Huazhou Li
University of Alberta
Edmonton, Canada
Metrics
H-Index
i10-Index
Citation Counts
35
91
4,280
Petroleum Engineering
Maya Kopylova
University of British Columbia
Vancouver, Canada
Metrics
H-Index
i10-Index
Citation Counts
35
73
5,221
diamond
diamond inclusions
mantle petrology
mantle xenoliths
kimberlite petrology
Shengnan Nancy Chen
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
32
93
3,248
reservoir engineering
machine learning
unconventional reservoir development
simulation and optimization
Hemanta Sarma
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
31
96
3,880
petroleum engineering
enhanced oil recovery
chemical engineering
Thomas Skulski
Natural Resource Canada
Ottawa, Canada
Metrics
H-Index
i10-Index
Citation Counts
29
75
3,452
tectonics
igneous petrology
geochemistry
isotope geochemistry
Precambrian geology
Amin Ghanizadeh
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
28
50
4,852
Unconvetional oil/gas
Geological CO2 sequestration
Subsurface H2 storage
Li-rich brines
S Hossein Hejazi
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
28
63
2,577
Porous Media
Interfacial Flows
Hydrodynamic Stability
Fluid Mechanics
Petroleum Engineering
Patricia Corcoran
Western University Canada
London, Canada
Metrics
H-Index
i10-Index
Citation Counts
28
49
6,812
Microplastics
Sedimentary Petrology
Herman S Grutter
University of Alberta
Edmonton, Canada
Metrics
H-Index
i10-Index
Citation Counts
23
33
3,334
Petrology
Geochemistry
Diamond
Porphyry
Ralf Tappert
Lakehead University
Thunder Bay, Canada
Metrics
H-Index
i10-Index
Citation Counts
21
28
2,159
Mantle Petrology
Carbon Cycle
Diamonds
Kimberlites
Amber
Mary Lou Bevier
University of British Columbia
Vancouver, Canada
Metrics
H-Index
i10-Index
Citation Counts
20
34
1,451
Isotope geology and geochronology
petrology
field geology
geoscience education
Jesse Williams Kovacs
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
19
24
1,241
Reservoir Characterization
Rate-Transient Analysis (RTA)
Pressure-Transient Analysis (PTA)
Modeling
Reserves Evaluations
Hamidreza Hamdi
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
19
40
1,104
Petroleum Engineering
Per Kent Pedersen
University of Calgary
Calgary, Canada
Metrics
H-Index
i10-Index
Citation Counts
18
39
1,894
Reservoir Characterization