白龙江流域新构造断裂带岩层物性综合研究  

Research on physical property of stratigraphy across new tectonic zone in Bailongjiang drainage basin

作　　者：金维浚[1,1] 杨为民[2] 张文辉 焦守涛[4] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国地质科学院地质力学研究所,北京100089 [3]国土资源部经济研究院,河北燕郊065000 [4]中山大学地球科学学院,广东珠海5190005

出　　处：《地球物理学进展》2018年第1期30-38,共9页Progress in Geophysics

基　　金：中国地质调查局项目(1212011120072); 国家自然科学基金(41372324,41672321)资助.致谢 感谢中国地质调查局地质力学研究所张春山研究员、黄晓、刘廷等在野外工作过程中提供的帮助,感谢审稿专家提出的宝贵修改意见!

摘　　要：白龙江流域属于青藏高原东北部新构造活动区,发生过甘肃舟曲2010年8.8泥石流灾害和甘肃岷县2013年7.22的6.6级地震,新构造常沿原大断裂带重新活动,断裂带结构复杂,宽度较大,并在岩层电阻率和地震波速度等物性上与围岩有差异,采用高密度电法和地震折射层析成像等综合方法,探测结果表现为破碎带上伏第四系厚度增大,破碎带由于裂隙发育,张性裂隙充填地下水后呈现低电阻率特征,但是岩层地震波速度与围岩变化不大.对于老断裂带在较长时间演化历史下裂隙带沉积充填胶结物,愈合断裂带电阻率和地震波速度与围岩差异不明显,采用综合物探方法是研究新构造断裂带有效手段.The Bailongjiang drainage basin belongs to the new tectonic activity area in the northeastern Qinghai-Tibet Plateau,where occurred the 8. 8 Zhouqu debris flow disaster in 2010,and Minxian County 7. 22 earthquake in 2013 in Gansu Province. The new structure is often re-active along the original fault zone. The fault zone is of the large width,with the different resistivity and seismic wave velocity from those of the surrounding rock. The results of the high density DC method and the seismic refraction tomography are improved that the tectonic zone is of the large Q thickness,are characterized by the low resistivity after filling with groundwater due to fracture development. The wave velocity of stratigraphy does not change much from the surrounding rock ＇s velocity. For the old fault zone,the resistivity and the seismic velocity are not obvious different from the surrounding rock in the sealed fracture zone. The comprehensive geophysical method is an effective method to study the tectonic fault zone.

关 键 词：活动构造 电阻率 地震波速 岩石物理性质 

分 类 号：P541[天文地球—构造地质学] P631[天文地球—地质学]