Several Genetic Mechanisms of Immature Crude Oils in China

Key words: 
• immature oil /
• genetic constitution /
• modle of hydrocarkon generation

Abstract: Based on a detailed literature investigation into the generation and occurrence of Chinese and inter-national immature crude oils, the authors selected 9 Tertary sedimentary sags as typical cuses for system-atic analysis and study in combination with the comparative study of typical crude oils and source rocksfrom 5 M eso Cenozoic medium to small size sedimentary basins in China, totally 102 wells and relatedsurface or coal mine sections were involved and 33 oil and 563 rock samples were collected f o r o rganicgeocheen cal, organic petrological and isotopic geocheen cal analyses, altogether 24 different analyticaltechniques were used and plentiful experimental data were obtained, in the basis of which, 5 geneticmechanisms of early generation for immature crude oils, i. e.,hydrocarbons derived from subrinite, resi-nite, bacteria-reworked terrestrial organic metter, algal and higher plant biolipids as well as sulfur-rchromolecules(such as non}ydrocarbons,asphaltenes and Typell kerogen),were proposed.