逆掩断层垂向封闭性定量模拟实验及评价方法

QUANTITATIVE SIMULATION EXPERIMENT AND EVALUATION METHOD FOR VERTICAL SEAL OF OVERTHRUST

在正确分析逆掩断层形成的地质条件和封闭机理的基础上 ,本文认为与逆掩断层相伴生的塑性岩石的变形特征、断面压力和断裂带中泥质含量是影响断层垂向封闭性的主要因素。进行了断裂带填充物中泥质含量与断层封闭性定量关系物理模拟实验 ,并分析了岩石变形特征对断层封闭性的影响 ,建立了断层封闭性评价标准 ,提出了利用断裂带填充物质的性质、断面压力和膏泥岩变形特征评价断层封闭性方法。选择了库车坳陷克拉 3号构造进行了实例分析 。

Based on study on the formation conditions of overthrust and its seal mechanism, this paper considered that the main factors influencing vertical seal of overthrust depended on deformation characteristics of plastic rocks accompaning overthrust, pressure exerted on fault zone and mudstone content in fault zone. A simulation experiment on the quantitative relation between mudstone content in fault zone and vertical seal of overthrust was carried out. In addition, this paper analyzed the influence of deformation characteristics of rocks on vertical seal of fault. The evaluation standard for vertical seal of fault was established which put forward a method evaluating vertical seal of fault by the mudstone content in fault zone, the pressure exerted on fault plane and the deformation characteristics of gypsum bearing mudstone. Taking the Kela 3 Structure in the Kuqa Depression as an example, the vertical seal of fault was studied, and the results indicated the method being reliable.