Origin of Lacustrine Hydrothermal Sedimentary Rock (Lower Cretaceous) in Qingxi Sag and Its Significance

FAN Ming tao; YANG Ling ke; FANG Guo yu; WANG Man fu; LI Tie feng; ZHU Li dong

Lower Cretaceous muddy dolostone distributed Qingxi sag, Jiuxi depression is characterized by the high content of special mineral assemblage including clay-sized albite and quartz, ankerite and barite, and so on.So far, there have been different debates on the origin of this special rock type, resulting in the difficult evaluation on the muddy dolostone reservoir.Based on the systematic structural, depositional and petrologic study on this kind of rock, this paper has pointed out that the rock is closely related to the overflow of thermal water from lake bottom, and, furthermore, discusses the role of the special rock in controlling petroleum formation as well as the future exploration direction.

1. Research Center of Yumen Oilfield Co.Ltd.CNPC, Yumen Gansu 735200;

2. College of Geosciences, Chengdu Science and Technology University, Chengdu 610059

Received Date: 2003-04-08

Rev Recd Date: 2003-06-08

Publish Date: 2003-12-10

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Abstract: Lower Cretaceous muddy dolostone distributed Qingxi sag, Jiuxi depression is characterized by the high content of special mineral assemblage including clay-sized albite and quartz, ankerite and barite, and so on.So far, there have been different debates on the origin of this special rock type, resulting in the difficult evaluation on the muddy dolostone reservoir.Based on the systematic structural, depositional and petrologic study on this kind of rock, this paper has pointed out that the rock is closely related to the overflow of thermal water from lake bottom, and, furthermore, discusses the role of the special rock in controlling petroleum formation as well as the future exploration direction.

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Origin of Lacustrine Hydrothermal Sedimentary Rock (Lower Cretaceous) in Qingxi Sag and Its Significance

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