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《Acta Sedimentologica Sinica》 2003-04
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Organic Geochemistry and Origin Types of Crude Oils from the Northern Area of the Dongyin Depression

LU Hong you XIAO Xian ming LIU Zhong yun GAO Xi long GUO Ru tai WANG Jian bao (State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640)  
Petroleum pools occur widely with a few sets of reservoirs in the Northern Area of Dongyin Depression. Organic geochemical methods and carbon isotopic analysis of single compounds have been applied to investigate the typical crude oils from this area. The results show that there are three origin types of crude oils which can be identified mainly by the five geochemical parameters: Pr/Ph, Pr/ n C 17 , Ph/ n C 18 , Gammacerane/ C 30 hopane , Ts/Tm and carbon isotopic value of single compounds. The five parameters for Type Ⅰ are 1.0~1.3, 0.40~ 0.80 , 0.10 and 0.80~1.30, respectively, with a heavier carbon isotopic value of single compounds. The five parameters for Type Ⅲ are 0.8-0.3, 1.0~0.6, 2.0~1.0, 0.40, 0.4~0.70 , respectively , with a lighter carbon isotopic value of single compounds. The above geochemical parameters of Type Ⅱ crude oils are between type Ⅰ and Type Ⅲ. The geological distribution of the three types of crude oils areas as follows: Type Ⅲ occurs widely, around the Lijing Depression and the Minfeng Depression, but types Ⅰ and Ⅱ occur locally, mainly around the Lijing Depression. The results are greatly significant to understand the origin of petroleum pools and the definition of petroleum system for this area.
【Fund】: 国家自然科学基金项目 (批准号 :40 0 72 0 4 3)资助
【CateGory Index】: P618.13
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