用远震接收函数研究渤海盆地的沉积覆盖  

Sedimentary Cover in the Bohai Basin using Teleseismic Receiver Function

作　　者：贺传松[1] 朱露培 丁志峰[1] 潘纪顺[3] 

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]Department of At mosphere and Earth Science,University of Saint Louis [3]华北水利水电学院,郑州450011

出　　处：《地质学报》2010年第5期716-722,共7页Acta Geologica Sinica

基　　金：科技部科技基础性工作专项"华北地下精细结构探查"(编号2006FY110100)资助的成果

摘　　要：本研究收集了华北地震台网近6年的远震数据,提取有效接收函数12000余条,对同一台站的接收函数进行了叠加;用固定值域模拟搜索技术,获得了台站下方覆盖层(沉积覆盖)的厚度和Vp/Vs比,有效数据点27个,合理地覆盖了研究区。计算结果显示,上覆地层厚度受到北东向构造影响,由北西至东南渐次增厚;Vp/Vs与上覆地层厚度和P波延时成正比,上覆地层厚度大致与Vp/Vs比成正比;上覆地层厚度与S波速度成反比,与地层的松散度成正比。研究显示,上述结果为场地条件和工程领域的研究提供了约束参数;同时,我们认为,本研究为油气勘探和油气储量计算提供了新的技术和思路。The seismic data in our study had been collected from seismographic network in North China for the past six years,and more than 12,000 valid receiver functions had been obtained.Receiving function at every station was stacked.Thickness of overlying strata and Vp/Vs ratio at the stations were acquired using fixed range simulation search techniques.Meanwhile,twenty seven points with valid data were produced,reasonably covering the whole research area.The calculation results indicate that affected by NE-trending structure,the thickness of overlying strata is increasing gradually from northwest to southeast.The Vp/Vs ratios are in proportional to the thickness of overlying strata and time delay of P-wave time,but the thickness is in inverse proportion to S wave velocity as well as the degree of looseness of the sedimentary cover.Our research shows that above results provide constraint parameters for the site conditions and seismic engineering,at same time,we consider our research provides a new technique for the oil gas exploration and reserves calcultation.

关 键 词：接收函数 沉积覆盖 Vp/Vs比 场地条件 油气资源 

分 类 号：P631.43[天文地球—地质矿产勘探]