大地电磁测深时间域拓扑处理去静态方法研究
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摘要
本文在全面了解国内外有关文献资料基础上,针对目前已有的大地电磁测深静态效应校正方法存在的不通用问题,引入数学拓扑原理为大地电磁法去静态效应提出了一种以野外实际观测资料为基础的可通用的全新方法——时间域拓扑处理去静态效应方法。为实现这一新方法,本文做了以下具有开拓性的研究工作:
1)在对前人大量的文献、资料深入研究的基础上认为:空间滤波法、阻抗张量分解法、瞬变电磁资料校正法、正反演计算法、已知地质信息的综合解释法等,所有现有的静态校正方法在实际应用中,均受一定的限制条件和人为认识参与的局限,使其难以成为可广泛应用的通用校正方法。
2)从空间采样的实质出发,通过研究连续剖面(CEMAP)观测的布设特点发现,对相邻电偶极电场观测值进行叠加(电场具有可叠加性)可提取出连续剖面(CEMAP)观测结果中所隐含的变极距观测信息。据此,本文提出对连续剖面(CEMAP)的电场观测结果进行叠加拓扑处理,以获取同一记录点不同极距的观测结果。用以反映和刻画出该记录点与局部不均匀体边界的空间关系,以达到探测浅部地质体和去除静态偏移的目的。率先将拓扑方法引入物探数据处理领域。
3)利用前人的理论模型,通过进一步的理论分析建立了局部不均匀体上不同部位各记录点随拓扑观测极距变化可能出现的静态偏移模型。以此为基础,初步建立了拓扑处理结果的图形展示和分析解释方法。
4)采用逐级叠加技术解决了现有单点观测仪器所获原始时间序列数据记录格式复杂(非适应拓扑处理采集记录格式)以及占用存储空间大等给拓扑处理所造成的技术难点。编制了适应单点两分量和剖面单分量标量叠加的两个拓扑处理程序。为拓扑处理软件的进一步发展奠定了基础。
5)通过野外实验对这一新方法进行了初步验证。结果表明,拓扑处理技术新方法可以实现去静态的目的。野外实验也证实现有仪器设备性能指标可满足拓扑处理的基本要求,为我们开发更先进的仪器提供了相应的技术参数。
On the basis of fully understand of domestic and international literature, aiming at the problem that there isn’t a general method could do correction of static shift in MT, using the topology theory puts forward a new general static shift correcting method of MT basing on field observation data—removing static shift of MT using time domain topology processing method. The main content and conclusions are as follows :
1) In the basis of a great quantity of papers and data, we considered that all static shift correcting method in field application have some limited and human influence, including spatial filtering method , impedance tensor decomposition method ,using TEM data correcting method, forward and inversion calculation method, comprehensive explanation using known geology information method and so on. Those methods can hardly become the general method.
2) From starting with the research of the essence of space sampling ,through the research of the character of CEMAP’S observation device ,we can composed the observed electric field value of two adjacent poles together(because the electric field could be superposed), we found out the implied information with the change of pole’s distance in CEMAP data. So we put forward that using topology method process the CEMAP data, obtaining observation result with different pole distance in the same site. Further using those result research the relationship between site record and boundary of uneven body in space, prospect the shallow geological-mass and remove the static shift. This research take the lead in bringing the topology method into geophysical date processing field.
3) Using the predecessor's theory model, and the theory analysis we can make it possible that static shift model of different record site on the uneven body ,and the changing of static shift with the distance between records poles using topology procession. On the basis of the model , we build the graphics display of topology result and analysis interpretation method.
4) Using the classification stacking technique we solved the problem of the complex format of time series observed by the instrument designed for single site (un-fit record format of topology procession),and the problem of occupy lots of the storage space . Software package was compiled suiting for single site two components and profile single component superposition, and it lead the foundation of the development of topology processing soft.
5) Through this new method of field experiment conducted a preliminary validation. The results show that the topological processing technology can romove the enfluence of static .The experiments also confirmed that the existing equipment performance can meet the requirements for topology method ,this experiment provinde corresponding technical parameters for developing more advanced equipmen.
1)在对前人大量的文献、资料深入研究的基础上认为:空间滤波法、阻抗张量分解法、瞬变电磁资料校正法、正反演计算法、已知地质信息的综合解释法等,所有现有的静态校正方法在实际应用中,均受一定的限制条件和人为认识参与的局限,使其难以成为可广泛应用的通用校正方法。
2)从空间采样的实质出发,通过研究连续剖面(CEMAP)观测的布设特点发现,对相邻电偶极电场观测值进行叠加(电场具有可叠加性)可提取出连续剖面(CEMAP)观测结果中所隐含的变极距观测信息。据此,本文提出对连续剖面(CEMAP)的电场观测结果进行叠加拓扑处理,以获取同一记录点不同极距的观测结果。用以反映和刻画出该记录点与局部不均匀体边界的空间关系,以达到探测浅部地质体和去除静态偏移的目的。率先将拓扑方法引入物探数据处理领域。
3)利用前人的理论模型,通过进一步的理论分析建立了局部不均匀体上不同部位各记录点随拓扑观测极距变化可能出现的静态偏移模型。以此为基础,初步建立了拓扑处理结果的图形展示和分析解释方法。
4)采用逐级叠加技术解决了现有单点观测仪器所获原始时间序列数据记录格式复杂(非适应拓扑处理采集记录格式)以及占用存储空间大等给拓扑处理所造成的技术难点。编制了适应单点两分量和剖面单分量标量叠加的两个拓扑处理程序。为拓扑处理软件的进一步发展奠定了基础。
5)通过野外实验对这一新方法进行了初步验证。结果表明,拓扑处理技术新方法可以实现去静态的目的。野外实验也证实现有仪器设备性能指标可满足拓扑处理的基本要求,为我们开发更先进的仪器提供了相应的技术参数。
On the basis of fully understand of domestic and international literature, aiming at the problem that there isn’t a general method could do correction of static shift in MT, using the topology theory puts forward a new general static shift correcting method of MT basing on field observation data—removing static shift of MT using time domain topology processing method. The main content and conclusions are as follows :
1) In the basis of a great quantity of papers and data, we considered that all static shift correcting method in field application have some limited and human influence, including spatial filtering method , impedance tensor decomposition method ,using TEM data correcting method, forward and inversion calculation method, comprehensive explanation using known geology information method and so on. Those methods can hardly become the general method.
2) From starting with the research of the essence of space sampling ,through the research of the character of CEMAP’S observation device ,we can composed the observed electric field value of two adjacent poles together(because the electric field could be superposed), we found out the implied information with the change of pole’s distance in CEMAP data. So we put forward that using topology method process the CEMAP data, obtaining observation result with different pole distance in the same site. Further using those result research the relationship between site record and boundary of uneven body in space, prospect the shallow geological-mass and remove the static shift. This research take the lead in bringing the topology method into geophysical date processing field.
3) Using the predecessor's theory model, and the theory analysis we can make it possible that static shift model of different record site on the uneven body ,and the changing of static shift with the distance between records poles using topology procession. On the basis of the model , we build the graphics display of topology result and analysis interpretation method.
4) Using the classification stacking technique we solved the problem of the complex format of time series observed by the instrument designed for single site (un-fit record format of topology procession),and the problem of occupy lots of the storage space . Software package was compiled suiting for single site two components and profile single component superposition, and it lead the foundation of the development of topology processing soft.
5) Through this new method of field experiment conducted a preliminary validation. The results show that the topological processing technology can romove the enfluence of static .The experiments also confirmed that the existing equipment performance can meet the requirements for topology method ,this experiment provinde corresponding technical parameters for developing more advanced equipmen.
引文
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