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Subject
- Geology, Stratigraphic[remove]206
- Geology203
- Petroleum202
- Natural gas37
- Stratigraphic correlation27
- Cretaceous Geologic Period16
- Geological cross sections14
- Geology, Structural12
- Oil well logging10
- Paleozoic Geologic Period10
- Tertiary Geologic Period9
- Diagenesis8
- Mississippian Geologic Period7
- Oil fields7
- Sandstone7
- Devonian Geologic Period6
- Hydrocarbon reservoirs6
- Shale6
- Stratigraphic traps (Petroleum geology)6
- Gas fields4