This topic reviews the characteristics and categorizations of gas, as well as the properties, classifications, and alterations of crude oil. It includes the differences between non-hydrocarbon and hydrocarbon gases, and explores gas hydrates. Physical properties, chemical properties, and varying composition of crude oil are presented, and how these three elements can have both positive and negative effects on petroleum exploration are also explored. This topic also evaluates a typical classification scheme of the occurrence of crude oils.
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