Organic facies and hydrocarbon potential at DSDP Leg 64 Holes

They are rich in organic carbon (av. = 1.9%). Sediments from the margins of the Gulf are rich in oil-prone marine-amorphous organic matter.

Sediments from Guaymas Basin contain the same material plus abundant subordinate amounts of gas-prone terrestrially derived organic matter. The enrichment of all of these sediments in marine-amorphous components reflects deposition in a highly productive and oxygen-poor water mass. The sediments are thermally immature, except for those altered by hydrothermal activity or by the intrusion of sills.