可控震源地震在张掖盆地南缘逆冲断裂构造勘探中的应用

Application of Vibroseis Seismic Method to Exploring the Thrust Faults in the Southern Margin of Zhangye Basin

据已有地质资料分析研究,张掖盆地南缘存在隐伏叠瓦状逆冲断裂构造带。可控震源地震勘探可以精确、快速、有效探测隐伏断裂构造格局。通过野外试验确立了数据采集与处理抑噪关键技术。基于地震剖面标准反射波组的形态和相互空间位置变化,共解译推断逆冲断层4条、岩性分界面1处;查明了张掖盆地南缘第四系地层结构、厚度变化规律等地质要素。为张掖盆地水文地质填图提供了科学依据。

According to the known geological information, there is a concealed imbricated thrust fault belt on the southern margin of Zhangye basin, which can be explored accurately and effectively by vibroseis seismic. The key techniques for data acquisition and the noise suppression processing were got through the field experiments, as well as the high resolution seismic exploration data at southern margin of the Zhangye basin. Based on the form of the standard seismic reflection wave and the space position change to each other, 4 thrust faults and 1 lith- ologic interface were inferred. Vibroseis seismic method can not only find out the quaternary stratum structure, thickness variation and other geological factors, but also provide scientific evidence for hydro-geological map- ping in Zhangye basin.