六盘山盆地构造演化及对成藏的控制

多期次、多性质的构造演化制约着六盘山盆地的油气成藏,以构造变形解析为基础,通过盆地构造演化和叠加改造过程的重建,确立了六盘山盆地的构造叠加改造序列,其中晚燕山期至喜马拉雅期为盆地演化的关键构造变革期,发生构造正反转,且在喜马拉雅期盆地发生了强烈的断裂褶皱作用,推覆构造发育,根据盆地的构造演化和成烃演化,认为以石炭系、三叠一侏罗系烃源岩为油源的油气藏以次生油气藏为主,而以白垩系烃源岩为油源的油气藏则为原生油气藏,指出海原凹陷的肖家湾和凤凰山构造带、固原凹陷的寺口子构造带和三营隆起带以及盆地西南缘的月亮山推覆构造为有利勘探目标.

Tectonic Evolution and Its Control of Hydrocarbon Accumulation in Liupanshan Basin

The hydrocarbon accumulation was controlled by multiphase and distinct tectonic revolutions in Liupanshan Basin. On the basis of the analyses of tectonic deformation, the tectonic evolution was established by the reconstruction of basin evolution and structural superimposed reformation sequence. The analysis shows the key period of tectonic reconstruction is at the Late Yanshan epoch to Himalayan, in which the structure occurs positive inversion, and there generates fault -fold structure and thrust nappe in Himalayan epoch in the basin. According to the relation of tectonic evolution and hydrocarbon generation, the research indicates the type of reservoir is mainly secondary in Carboniferous and Triassic-Jurassic systems, primarily in Cretaceous system, and the analysis shows the Xiaojiawan, Feng-huangshan structural beltts, Sikouzi, Sanying uplift belt and Yueliangshan nappe are advantageous exploration areas.