青西凹陷下白垩统湖相喷流岩成因探讨及其意义

青西凹陷下白垩统泥云岩 (泥质白云岩、白云质泥岩、白云岩,统称“泥云岩”)以其富含泥级钠长石、石英、铁白云石和重晶石等特殊矿物成分为特点。从构造、沉积、岩石学等方面对青西凹陷下白垩统泥云岩进行了地质分析,指出泥云岩的成因与湖底热水喷流有关。

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

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.