摘要
重力梯度张量是重力位沿不同方向的二阶导数,具有高精度、高分辨率的特征,能更准确地描述地质体的分布和形态.现今重力张量异常的欧拉反褶积法是利用重力张量与不同方向重力来获取场源体的位置信息,并未考虑不同方向重力背景异常差异对反演结果的影响,为了消除重力背景异常差异给张量欧拉反褶积法带来的误差,提出重力梯度张量联合欧拉反褶积法,方法是通过对现今张量欧拉反褶积公式沿不同方向进行求导,并对其进行不同形式的联立,通过理论模型讨论了不同组合形式的反演效果,同时还比较了不同大小采样点距下方法的反演效果,结果显示采用特定的四个分量联立得到方程组比常规方法的计算结果更加准确,且可以在更大的采样点距下准确反演地质体的位置,结论表明四个特定分量的联立可以在两倍于常规方法的点距下更加准确收敛地计算出地质体位置.最后将方法应用在文顿盐丘实际数据中,结合地震结果来看方法的实际效果良好.
The gravity gradient tensor is the second derivative of the gravity potential in different directions. It has the characteristics of high precision and high resolution, and can describe the distribution and morphology of geological bodies more accurately. The Euler deconvolution method of current gravity tensor anomalies USES gravity tensor and gravity in different directions to obtain the position information of the field source body without considering the influence of gravity background anomalies in different directions on the inversion results. We propose a combined Euler deconvolution method of gravity gradient tensor which takes the derivative of the tensor euler deconvolution formula in different directions and unite them in the different forms. The inversion effect of gravity tensor combined with Euler deconvolution method is discussed by theoretical model, and the influence of different acquisition methods of tensor data and different component combination inversion on the result is mainly discussed, The results shows system of equations which use specific components is more accurate than conventional methods. The conclusion is that system of equations which use specific components calculated the position of geological body accurately when the distance is twice as conventional methods’ s. Finally, gravity gradient tensor combined with Euler deconvolution method is applied to the interpretation of actual data, and the distribution of geological body is obtained, and the buried depth is consistent with the seismic profile.
作者
马国庆
吴琪
李丽丽
MA Guo-qing;WU Qi;LI Li-li(College of Geoexploration Science and Technology,Jilin University,Changchun 130026,China;Institute of National Development and Security Studies,Jilin University,Changchun 130012,China)
出处
《地球物理学进展》
CSCD
北大核心
2020年第6期2188-2193,共6页
Progress in Geophysics
基金
“十三五”国家重点研发计划课题(2017YFC0601606)资助。
关键词
重力梯度张量
联合欧拉反褶积
应用方式
点距
Gravity tensor gradient
Joint Euler deconvolution
Application way
Interval
