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|+ {{table number|1}}Attributes of direct and indirect basin-centered gas systems
|+ {{table number|1}}Attributes of direct and indirect basin-centered gas systems
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! Type || Source rocks || Reservoir in-situ permeability (md) || Hydrocarbon migration distance || Reservoir pressure || Pressure mechanism || Seal || Seal quality || Nature of upper boundary || Thermal maturity top of BCGA || Occurrence
! Type || Source rocks || Reservoir in-situ permeability (md) || [[Hydrocarbon migration]] distance || Reservoir pressure || Pressure mechanism || Seal || Seal quality || Nature of upper boundary || Thermal maturity top of BCGA || Occurrence
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| Direct || gas-prone type III kerogen || <0.1 || short || over-/underpressure || hydrocarbon generation || capillary || variable || cuts across stratigraphy || >0.7% R<sub>o</sub> || downdip from water
| Direct || gas-prone type III kerogen || <0.1 || short || over-/underpressure || hydrocarbon generation || capillary || variable || cuts across stratigraphy || >0.7% R<sub>o</sub> || downdip from water