【摘要】 晚白垩世反转构造在酒泉盆地广泛分布,这一期反转构造对油气聚集具有重要意义。文章应用变形定量分析和构造建模方法对酒泉盆地晚白垩世的反转构造进行了研究,研究认为酒泉盆地晚白垩世反转构造的几何形态主要表现为反转断层及其相关褶皱的组合。晚白垩世的反转断层是在先存正断层的基础上发育,反转构造的样式与先存正断层的几何形态及其晚白垩世应力场有密切关系。大部分褶皱枢纽与早期 NE方向的断层平行,反映了NW—SE向的挤压应力。通过对酒泉盆地四个凹陷的反转断层的反转率计算,得出青西凹陷、花海—石大凹陷、营尔凹陷和马营凹陷的断层反转率分别为:0.39、0.29、0.38、0.32,反转率大小相近,平均为 0.34,属于中等—强烈程度的反转。更多还原

【Abstract】 The Late Cretaceous overturned structures widely occur in Jiuquan Basin, which is of great importance to oil and gas accumulation. Through investigation the overturned structures by applying deformation quantitative analysis and structural modeling, it was considered that their geometrical shapes are expressed as the assemblage of overturned faults and relevant folds; the overturned faults were developed on the basis of prior-existing normal faults; the shapes of the overturned structures are closely related to the prior-existing normal faults and the regional stress firlde in Late Cretaceous; and most of the axial hinge surface of the folde are parallel to the early NE faults, which shows a NW—SE compressive stress. In light of the calculation results, the overturn ratios of the overturned faults in four depressions, i.e. Qingxi, Huahai-Shida, Ying’er and Maying Depressions, in Jiuquan Basin are 0.39, 0.29, 0.38 and 0.32 respectively, so that they are very close to each other with an average value of 0.34 and belong in a medium-strong overturn.更多还原