线形区域的主辅线反射地震调查方法  

Additional-observation seismic reflection method for investigation of linear areas

作　　者：杨文采[1] 张春贺[2] 黄秋平 程振炎[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]国土资源部油气资源战略研究中心,北京100034 [3]华北石油局第四物探大队,河南新乡453700

出　　处：《地球物理学报》2005年第6期1325-1335,共11页Chinese Journal of Geophysics

基　　金："九五"国家重点科学工程项目"中国大陆科学钻探工程";国家重点基础研究发展计划(973)项目(2003CB716505)资助

摘　　要：本文提出主辅线反射地震法,它由一条主测线和1～2条辅测线共同组成一个反射地震观测系统,其中辅线位于主线的一侧或两侧,大致与主线平行,只在辅线上观测而不放炮.这种系统的成本仅比原常规单线增加20%左右,但是,它却可以同时取得三方面的调查成果:(1)主线常规反射地震剖面,(2)主线与辅线之间区域的表层地震波速层析图,(3)主线与辅线之中线上的反射地震剖面.用比地震剖面略高的费用,主辅线反射地震实现了了解线形区域下方侧向可对比的地质构造变化的目标,对线形区域的调查尤其适用,而且在中国大陆科学深钻孔区完成的主辅线反射地震调查证实了这一论断.这次主辅线反射地震法调查说明科学深钻孔区地下3000～3600m深度还可能有规模较大的榴辉岩体存在,现有金红石矿体储量有可能扩大若干倍.同时,主辅线反射地震法调查提供了一个后备孔位,它是将来扩大矿区储量的首选勘探孔位.We suggest a new seismic data-acquisition system called the additional observation system, which consists of a main line and one or two additional lines that are approximately parallel to the main line but without any shot-point. The cost of the system is about 20% more than a traditional seismic reflection line, but it can produce three different investigation results as follows： （a）The traditional reflection profile along the main line; （b） the seismic velocity map between the mainline and the additional line via seismic tomography; and （c） an additional seismic reflection profile along the middle between the mainline and the additional line via 3-D seismic data processing. This system costs a little bit of more money to gain much more results, especially the side-variation of velocity and structures, very proper for investigation of linear areas. An experiment of this method has been carried out at the Chinese Continental Scientific Drilling site, proving that the suggested system is applicable and valuable. This experiment provides an optional hole-location for the scientific reveals that there are deeply buried rutile-containing eclogite bodies existing beneath the drilling drilling, and site.

关 键 词：线形调查区域 反射地震剖面 主辅线 层析成像 大陆科学钻探孔区 

分 类 号：P315[天文地球—地震学]