可控震源高分辨率地震勘探采集技术——以莫桑比克2005年项目为例
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摘要
本文以2005年莫桑比克可控震源高分辨率地震采集项目为例,介绍了可控震源高分辨率勘探的施工方法及质量保证措施。施工方法包括环境噪声测试、基本参数的确定、震源参数的确定几个环节,震源参数的确定是其中的关键环节。文中针对工区西部、北部、东部表层地质条件的差异,进行了详细的点、段试验,确定了扫描频率、扫描长度、扫描次数、驱动幅度、扫描信号斜坡以及仪器前放增益等震源参数。质量保证措施包括野外和室内两个环节,野外环节是其中的重要环节,包括检波点和炮点点点实测、保证检波器的接收质量、降低震源相关干扰、加强仪器现场质量监控几个方面。文中方法对国内可控震源高分辨率勘探有一定的借鉴意义。
Taking the project of vibroseis' high-resolution seismic acquisition in Mozambique in 2005 as a case,the paper introduced the construction approaches and quality assurance measures.The construction approaches included several links such as environment noise tests,and determination of basic parameters and source parameters among which the determination of source parameters was key link.In view of the difference of geologic conditions on the surface in the western,northern and eastern parts of working zone,the paper implemented detailed experiments at points and on segments,determining such source parameters as sweep frequency, length,number of times, drive amplitude, slope value of sweep signal and preamplifier gain of seismograph.The quality assurance measures included two links: indoor and field, the field link was important one among the two,including actual some aspects such as measurement point by point for receiver and shot points,guaranteeing the receiving quality of geophone,reducing coherent interference of source and enforcing on-site QC of seismograph.The approaches in the paper can provide some references to vibroseis' high-resolution exploration at home.
Taking the project of vibroseis' high-resolution seismic acquisition in Mozambique in 2005 as a case,the paper introduced the construction approaches and quality assurance measures.The construction approaches included several links such as environment noise tests,and determination of basic parameters and source parameters among which the determination of source parameters was key link.In view of the difference of geologic conditions on the surface in the western,northern and eastern parts of working zone,the paper implemented detailed experiments at points and on segments,determining such source parameters as sweep frequency, length,number of times, drive amplitude, slope value of sweep signal and preamplifier gain of seismograph.The quality assurance measures included two links: indoor and field, the field link was important one among the two,including actual some aspects such as measurement point by point for receiver and shot points,guaranteeing the receiving quality of geophone,reducing coherent interference of source and enforcing on-site QC of seismograph.The approaches in the paper can provide some references to vibroseis' high-resolution exploration at home.
引文
[1]陆基孟主编.地震勘探原理.山东东营:石油大学出版社,1993
[2]李庆忠.走向精确勘探的道路.北京:石油工业出版社,1993
[3]俞寿朋.陆上三维地震勘探的设计与施工.石油地球物理勘探局,1996
[2]李庆忠.走向精确勘探的道路.北京:石油工业出版社,1993
[3]俞寿朋.陆上三维地震勘探的设计与施工.石油地球物理勘探局,1996
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