青藏高原冻土地球物理勘查方法组合模式

Combination model of geophysical exploration methods for the permafrost area of the Tibetan Plateau

在全球气候日益变暖的情况下,青藏高原多年冻土退化将导致区域水文地质条件发生改变,进而影响到区域水资源循环过程和生态环境,需要开展青藏高原地区冻土地球物理勘查技术方法研究,以实现了解冻土地球物理特征、空间分布信息等。针对以上情况,对地震反射、地震转换波反射、地震折射、探地雷达、音频大地电磁(EH4)、高密度电阻率法这6种技术方法的探测效果进行了对比试验研究。研究结果表明,6种物探技术方法均可探测地层结构、冻土地球物理特征、空间分布信息等,但各种技术方法均存在一定局限性。针对不同目标任务,提出了3种青藏高原冻土地球物理勘查方法组合模式。该组合模式可为今后青藏高原冻土地球物理勘查提供技术支持。

In the case of global climate change and global warming, permafrost degradation on the Tibetan Plateau will resuh in great changes of the hydrogeological conditions, which is likely to seriously affect the regional water cycle and ecological environment.The purpose of carrying out research on the geophysical exploration technology is to realize the understanding of geophysical characteristics and the spatial distribution of permafrost.In view of the above situation, 6 kinds of technical methods, i.e., seismic-reflection, converted-wave seismic survey, seismic-refraction, geological radar and audio magnetotelluric survey （EH-4）, were compared with each other and analyzed through experimental study.The results show that 6 kinds of geophysical exploration methods can detect permafrost structure, geophysical characteristics, spatial distribution of permafrost and some other geological phenomena; nevertheless, all kinds of technical methods have certain limitations.According to different target tasks, the authors put forward a combination model of three kinds of geo- physical exploration methods to detect permafrost in the Tibetan Plateau.This combination model provides technical supports for the geo- physical exploration of the permafrost in the Tibetan Plateau.