摘要
雄安新区城市规划建设对地下空间的高精度勘探提出了高要求,作为具有高分辨率的地面物探方法,反射波地震勘探技术具有良好应用前景。本文探究了厚覆盖区条件下的高精度有效反射地震探测技术,并利用反射纵波技术在雄安新区进行提高浅层分辨率的地震勘探方法试验。根据实际探测目标,通过对比分析不同检波器、震源类型、道距大小及接收排列长度等不同采集因素试验效果,探究已有条件下适宜的震源类型和最佳采集参数。结合实际资料处理和分层解释,试验研究表明,采用高频检波器、选择可控震源激发效果最佳,针对试验目标,结合小道距、适当排列接收等措施,可有效提高厚覆盖区50~300 m深度内反射纵波地震勘探的纵向分辨率,试验获得了丰富的有效波组信息,为内部地层精细划分和解释提供了依据。该方法可为类似环境下城市地下空间的精细探测提供有益参考借鉴。
The urban planning and construction of Xiong'an New Area puts forward high requirements for high-precision underground space exploration.As a high-resolution ground geophysical exploration method,reflective wave seismic exploration technology shows a good application prospect.In this paper,the high-precision and effective reflection seismic detection technology under the condition of thick coverage area was explored,and the reflective P-wave technology was used to improve the resolution of shallow seismic exploration methods in Xiong'an New Area.According to the actual detection target,the experiment results,considering different acquisition factors such as geophone,source type,trace space and receiving arrangement length,were compared and analyzed,and the appropriate source type and optimal acquisition parameters were explored under existing conditions.Combined with the actual data processing and stratified interpretation,the experimental research shows that the use of high-frequency geophone and the selection of vibroseis can achieve ideal excitation effect.According to the test target,the longitudinal resolution of internal reflective P-wave seismic exploration in the thick coverage area at 50~300 m depth can be effectively improved by combining the measures of trace space and appropriate arrangement and reception,and the test obtains rich effective wave group information.It praves a basis for the fine division and interpretation of the internal strata,and obtains a good test result.The method can provide a useful reference for the fine detection of urban underground space under similar environment.
作者
李广才
王小江
王凯
LI Guangcai;WANG Xiaojiang;WANG Kai(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang,Hebei 065000;National Center for Geological Exploration Technology,Langfang,Hebei 065000)
出处
《地质与勘探》
CAS
CSCD
北大核心
2024年第2期329-338,共10页
Geology and Exploration
基金
中国地质调查局项目(编号:DD20230298)
中国地质科学院基本科研业务费项目(编号:AS2020J03)联合资助。
关键词
可控震源
反射波
城市地下空间
高分辨率
雄安新区
vibroseis
reflective wave
urban underground space
high resolution
Xiong'an New Area
