Study on Genesis of Crude Oil from Qaidam Basin

DUAN Yi; ZHANG Hui; ZHENG Chao-yang; WU Bao-xiang

Qaidam basin is one of the largest petroliferous basins in the northwestern China. After 50 years oil-gas exploration, 18 oil fields have been found in this basin, which are mainly distributed in the western portion of Qaidam basin. Their geneses are always the focus in which people are interested. The physical and chemical character, oil-rock correlation and genetic mechanism are studied, it is indicated that the western Qaidam and the northern Qaidam are two different oil-generating units, that they have obviously different oil-forming environments, precursor types, maturity and source of oil. Although organic carbon abundance of source rocks is low, plant lipids are well preserved in the reducing and saline acustrine environments. Plant lipids together with soluble organic matter and kerogen can generate a significant volume of crude oil at low mature stage and be the main way to produce immature and low mature crude oils in the western Qaidam basin

Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 73000

Received Date: 2003-12-29

Publish Date: 2004-12-10

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Abstract: Qaidam basin is one of the largest petroliferous basins in the northwestern China. After 50 years oil-gas exploration, 18 oil fields have been found in this basin, which are mainly distributed in the western portion of Qaidam basin. Their geneses are always the focus in which people are interested. The physical and chemical character, oil-rock correlation and genetic mechanism are studied, it is indicated that the western Qaidam and the northern Qaidam are two different oil-generating units, that they have obviously different oil-forming environments, precursor types, maturity and source of oil. Although organic carbon abundance of source rocks is low, plant lipids are well preserved in the reducing and saline acustrine environments. Plant lipids together with soluble organic matter and kerogen can generate a significant volume of crude oil at low mature stage and be the main way to produce immature and low mature crude oils in the western Qaidam basin

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Reference (15)

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Study on Genesis of Crude Oil from Qaidam Basin

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