Research and application of joint-constrained inversion of transient electromagnetic multivariate parameter

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-11-01 DOI:10.1016/j.jappgeo.2024.105548
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Abstract

Due to the phenomena of stratigraphic inclination, complex structure, and lateral discontinuity of resistivity or layer thickness in most of the coal seams, the traditional one-dimensional transient electromagnetic inversion method has limitations in interpretation accuracy. In addition, two- and three-dimensional inversion and artificial intelligence inversion have problems of large computation and large sample size, respectively, which limit their application in small- and medium-sized engineering exploration. To improve the inversion effect, this study proposes a method of joint-constrained inversion of transient electromagnetic multivariate parameters. This method achieves the joint constraint inversion of the transient electromagnetic multi-parameter by making full use of the geological data and a priori information to construct the initial model and adding the constraints such as the resistivity, the thickness, and the layer interface of each layer in the inversion objective function, and at the same time, taking into account the spatial correlation of the stratigraphic structure between the neighboring measurement points, as well as the transverse and vertical constraints between the measurement points along the direction of the survey line and perpendicular to the survey line. First, a series of typical geoelectric models are established and numerically simulated, and the results are compared with those of the traditional inversion method to verify the applicability and effectiveness of the method. Then, the constrained inversion is carried out on the physical simulation and measured data, and the results are in good agreement with the actual geological conditions. The numerical simulation, physical simulation and measured data inversion results consistently prove that this method can effectively reduce the uncertainty of the inversion at the isolated measuring points, improve the spatial continuity of the formation boundary, and better reflect the actual geoelectric characteristics of the formation.
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瞬态电磁多变量参数联合约束反演的研究与应用
由于大部分煤层存在地层倾斜、构造复杂、电阻率或层厚横向不连续等现象,传统的一维瞬变电磁反演方法在解释精度上存在局限性。此外,二维、三维反演和人工智能反演分别存在计算量大、样本量大等问题,限制了其在中小型工程勘探中的应用。为了提高反演效果,本研究提出了一种瞬态电磁多变量参数联合约束反演方法。该方法通过充分利用地质资料和先验信息构建初始模型,并在反演目标函数中加入各层电阻率、厚度、层界面等约束条件,同时考虑相邻测点之间地层结构的空间相关性,以及测点之间沿测线方向和垂直于测线方向的横向和纵向约束条件,实现了瞬变电磁多参数的联合约束反演。首先,建立一系列典型的地电模型并进行数值模拟,将结果与传统反演方法进行比较,以验证该方法的适用性和有效性。然后,对物理模拟和实测数据进行约束反演,结果与实际地质条件吻合良好。数值模拟、物理模拟和实测数据反演结果一致证明,该方法能有效降低孤立测点反演的不确定性,提高地层边界的空间连续性,更好地反映地层的实际地电特征。
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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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