二度体位场边缘参数反演方法对比研究

发布时间：2018-11-16 13:30

【摘要】：近些年来,随着浅层资源的减少,深部资源的勘探工作成为了重点,地球物理工作者面临的要求也越来越高。在新的挑战下,地质工作今后的任务主要是寻找隐伏矿、深部盲矿、难识别矿种以及深层油气藏与多种构造形式的油气藏。因此,在这样的背景下,对场源的几何参数和物性参数反演研究就显得尤为重要。本文对二度体位场边缘参数反演方法进行了研究。二度体位场边缘参数反演方法主要有Werner反褶积法、总梯度模法、局部波数法、欧拉反褶积法、Tilt_depth、曲率属性反演法。根据理论模型不同,几种方法可分为三大类:点源类、二度薄板状体类和厚接触带类。点源类方法分为欧拉反褶积和曲率属性,该类方法反演的理论异常是点源异常,理论测试表明反演结果不受模型磁化方向的影响,对于点源模型反演结果精度高,适应性测试表明曲率属性能够适应较多的地质体模型,且反演精度较高,但无法反演模型体的水平位置;二度薄板状体类方法分为Werner反褶积、总梯度模(解析信号振幅)和局部波数,该类方法反演的理论异常是二度向下无限延深的薄板状体异常,理论测试表明反演结果不受二度向下无限延深的薄板状体的倾角和磁化方向的影响,对于二度薄板状体模型反演精度较高,适应性测试表明薄板状体类方法对各种模型具有较好的适应性;厚接触带类方法有Tilt-depth方法,该方法的理论模型为二度向下无限延深的垂直厚接触带,理论测试和适应性测试表明该方法反演结果受厚接触带的倾角影响较大,通用性差,适用情况单一。在各种二度体边缘参数反演方法反演时,利用构造指数估算技术能够有效的判断工区的地质模型,利用解地筛选技术对反演结果进行筛选,提高了反演精度,解线性方程组采用共轭梯度法提高了的解的稳定性。实际资料处理时,利用向上延拓导数计算技术能够有效的压制噪声,提高反演结果的精度和稳定性,提高了二度体边缘参数反演方法的实用性。总梯度模和局部波数方法反演模型体的深度和边界位置能够适应较多的模型体,曲率属性方法反演模型体的深度能够适应较多的模型体,但不能反演模型体的水平位置,Werner反褶积方法和欧拉反褶积方法次之,Tilt_depth只适应于垂直接触带的反演。最后,利用上述各方法对万安盆地内部一条剖面进行了反演,得到了该条剖面上的特征点边缘参数,反演结果与实际地质特征吻合。
[Abstract]:In recent years, with the decrease of shallow resources, the exploration of deep resources has become the focus, geophysical workers are facing higher and higher requirements. Under the new challenge, the main task of geological work in the future is to find hidden deposits, deep blind deposits, difficult to identify mineral types, deep oil and gas reservoirs and various structural forms of oil and gas reservoirs. Therefore, in this context, it is very important to study the inversion of geometric and physical parameters of the field source. In this paper, the inversion method of edge parameters of two dimensional position field is studied. The inversion methods of edge parameters of 2-D position field mainly include Werner deconvolution method, total gradient mode method, local wavenumber method, Euler deconvolution method and Tilt_depth, curvature attribute inversion method. According to different theoretical models, several methods can be divided into three categories: point source class, second degree thin plate type and thick contact zone class. Point source methods can be divided into Euler deconvolution and curvature attributes. The theoretical anomalies are point source anomalies. Theoretical tests show that the inversion results are not affected by the magnetization direction of the model, and the accuracy of the inversion results for the point source model is high. The adaptability test shows that the curvature attribute can adapt to more geological body models, and the inversion accuracy is higher, but the horizontal position of the model body can not be retrieved. The two degree thin plate method is divided into Werner deconvolution, total gradient mode (amplitude of analytical signal) and local wavenumber. Theoretical tests show that the inversion results are not affected by the dip angle and magnetization direction of the thin plate with two degrees downward and infinite depth, and the inversion accuracy of the second degree thin plate model is higher than that of the second degree thin plate model. The adaptability test shows that the thin plate method has good adaptability to various models. The method of thick contact band has Tilt-depth method. The theoretical model of this method is vertical thick contact zone with two degrees downward infinite extension. Theoretical test and adaptability test show that the inversion result of this method is greatly affected by the dip angle of thick contact zone, and the generality of the method is poor. The application is simple. In the inversion of various inversion methods for the edge parameters of two-dimensional bodies, the tectonic index estimation technique can be used to effectively judge the geological model of the working area, and the inversion results can be screened by using the solution screening technique, which improves the inversion accuracy. The stability of the solution is improved by conjugate gradient method. In actual data processing, the use of upward continuation derivative calculation technique can effectively suppress noise, improve the accuracy and stability of inversion results, and improve the practicability of the inversion method for the edge parameters of two-dimensional bodies. The depth and boundary position of the model body can be inversed by the total gradient mode and the local wavenumber method, and the depth of the model body can be obtained by the curvature attribute method, but the horizontal position of the model body can not be retrieved by the curvature attribute method. Werner deconvolution method and Euler deconvolution method take the second place, Tilt_depth is only suitable for vertical contact zone inversion. Finally, by using the above methods, a section inside the Wanan basin is inversed, and the boundary parameters of the characteristic point in the section are obtained, and the inversion results are in agreement with the actual geological characteristics.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631;P618.13

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