GEOCHEMISTRY AND GENESIS OF CRUDE OIL OF TAIZHOU FORMATION IN NORTHERN JIANGSU BASIN

Taizhou Formation in Northern Jiangsu Basin is still a new petroleum exploration area now. By analyzing the fractional composition of saturate hydrocarbon and aromatic hydrocarbon and the geochemical parameter of the crude oil, the geochemical characteristics of the crude oil are studied and the sedimentary environment, parent substance, the maturity and the source of the oil are investigated. The geochemistry of the crude oil is similar, the sterane is rich, the main terpane is the hopane and the regular sterane is the main sterane type. It is concluded that the oil-forming sources are mainly fungus and algae, not higher plants; the crude oils were formed in reducing and salt water environments, the salinity was higher and the reducibility was stronger in the northwest of Fudong Fault than in the southeast; the crude oil is immature.