School of Resources and Earth Science, China University of Mining & Technology Ministry of Education Key
Laboratory of, CBM Resources and Reservoir Formation Process PetroChina Coalbed Methane Company Limited

以鄂尔多斯盆地东缘保德地区为例,采用赤平投影方法,进行层面校正,比较层面恢复前后主应力方位,确定区域古构造应力场。研究表明:区域内构造行迹展布特征与构造应力场演化有较好的一致性;区域构造应力场主要受到燕山运动和喜山运动的影响,燕山期构造应力场奠定了研究区的主要构造格架,以挤压应力为主,拉张应力为辅,发育了NW-SE向挤压应力和NEE-SWW向的拉张应力,挤压应力在本区造成盖层滑脱现象,形成了一系列平行褶皱和逆断层,在区域内发育了一些走向NW-SE向的正断层;喜山期构造应力场以挤压应力为主,主压应力方位为NE-SW,两期构造运动的叠加使区域内东部构造发生偏转,由NW-SE向转为NE-SE向。该区的构造格局与东缘边界带的形成与发展有着密切的联系。

Taking Baode Area on the eastern edge of Erdos Basin as an example, using stereographic projection method for level correction, comparing the princip al stress orientation before and after restoration of level correction, the regional tectonic stress field was determined.The results show that the regional tectonic features and tectonic movement stress field evolution have good consistency, the regional tectonic stress field is mainly influenced by the Yanshan movement and Himalaya mov ement, Yanshan tectonic stress field established main tectonic research area of the frame. It's mainly influenced by extrusion stress, supplemented by tensile stress, an d also developed the NW-SE extrusion stress and tensile stress in NEE- sww direction, extrusion should have caused the cover slip phenomenon of power in this regio n, formed a series of parallel folds and thrust faults in the region development. Some direction of NW-SE normal faults can be found, and tectonic stress field in Himala ya is mainly influenced by extrusion stress. Principal compressive stress directions is NE-SW, superposition of two stages of tectonic movements caused the eastern te ctonic deflection region from NW-SE to NE-SE. The formation and development of the pattern and the eastern boundary zone are closely related.

中国石油天然气股份有限公司科学研究与技术开发资助项目(2010E-2207)；