青藏高原东北缘盆山结合部位深反射资料处理方法与初步地质认识  

Processing method of deep seismic reflection data from the basin-range junction zone on the northeastern margin of the Qinghai-Tibet Plateau and preliminary geological understanding

作　　者：王海燕[1] 高锐[1] 马永生[2] 朱铉[2] 李秋生[1] 李鹏武[1] 匡朝阳[1] 卢占武[1] 

机构地区：[1]中国地质科学院地质研究所岩石圈中心,北京100037 [2]中石化股份有限公司南方勘探开发分公司,云南昆明650021

出　　处：《中国地质》2007年第1期142-148,共7页Geology in China

基　　金：国家自然科学基金重点项目(40334035);青年科学基金项目(40604010)

摘　　要：盆山结合带地质条件复杂、地形起伏大,深地震反射资料具有信噪比低、各种干扰波严重以及速度横向变化大等特点。针对盆山结合部位深反射资料的特点,主要利用ProMAX处理系统对横跨若尔盖盆地和西秦岭造山带结合部位的二维深地震反射资料(简称SP04-2剖面)进行折射静校正、叠前去噪、地表一致性处理、人机交互速度分析、剩余静校正循环迭代处理、地表基准动校正叠加和叠后去噪处理等方法试验研究,形成一套适应盆山结合部位深地震反射资料的处理方法和流程,最终得到SP04-2叠加剖面。该剖面首次揭示出若尔盖盆地—西秦岭造山带盆山结合部位的岩石圈结构,为研究盆山深部接触关系提供了可靠的地震学依据。The basin-range junction zone has complex surface geological conditions and a rather undulate tomography, where deep seismic reflection data are characterized by a low S/N ratio, strong multifold noises and great lateral variation in velocity. According to the characteristics of these deep seismic reflection data, the authors used the ProMAX processing system to make refraction static correction, pre-stack noise attenuation, surface consistent processing, man-machine interactive velocity analysis, residual static correction circulating iterative processing, NMO based on surface and post-stack noise suppression on the 2-D deep seismic reflection data （or called the Spo4-2 profile） across the junction zone of the Zoige basin and West Qinling orogen and found a set of processing method and flow process suited to the low S/N ratio deep reflection data of the basin-range junction zone. Finally they got the SP04-2 stacked section. The section for the first time reveals the lithospheric structure of the basin-range junction zone of the Zoige basin and West Qinling orogen and offer a reliable seismologic basis for studying the contact relationships in the deep interior of the basin-range zone.

关 键 词：深地震反射 盆山结合部位 资料处理 信噪比 去噪 

分 类 号：P631.4[天文地球—地质矿产勘探]