Trial-and-error modeling of ground-airborne electromagnetic data in the Yishu faulting basin, China

IF 3 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Geophysics Pub Date : 2023-11-30 DOI:10.1190/geo2022-0452.1
Ming Zhang, Colin G Farquharson, Tingting Lin
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Abstract

Trial-and-error modeling may provide some level of interpretation of the subsurface while sacrificing certainty, and certainty it is a viable alternative for precise three-dimensional (3D) interpretation of real ground-airborne frequency-domain electromagnetic (GAFEM) data. Therefore, a semiautomatic trial-and-error modeling approach has been presented in this study. We first developed a 3D GAFEM forward modeling code. Its accuracy was demonstrated using a 3D synthetic model with a topography and a tilted anomalous body. An initial model was established based on known geological constraints. The code was repeated, and the parameters of the model were renewed semi-automatically based on a predefined geometry-resistivity combination list. The model that could achieve the minimum error between the computed response and collected GAFEM data was selected as the final model. We applied the proposed semi-automatic trial-and-error modeling approach to a geothermal resource survey in the Yishu Faulting Basin, China. The purpose of this survey was to interpret the resistivity structure of the subsurface and evaluate the potential development of geothermal resources in the survey area. The final model obtained by trial-and-error modeling, which was constrained by known geological information and subsurface geoelectric structures inferred from 2D models inverted by the CSAMT and MT data measured at the same location, indicated the existence of geothermal resources. This indication was supported by drilling results from a well site located on the survey line. A comparative analysis was also conducted between the model obtained by trial-and-error modeling and the models obtained by 3D inversion of the GAFEM dataset. The apparent resistivity was calculated using the same data. The results have shown that different approaches can achieve similar subsurface geometries and resistivity distributions for faulting basin structures.
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中国沂沭断陷盆地地空电磁数据试错建模
试错建模可在一定程度上解释地下情况,但会牺牲确定性,而确定性是精确解释真实地空频域电磁(GAFEM)数据三维(3D)的可行替代方法。因此,本研究提出了一种半自动试错建模方法。我们首先开发了三维 GAFEM 正向建模代码。我们使用一个具有地形和倾斜异常体的三维合成模型对其准确性进行了验证。根据已知的地质约束条件建立了初始模型。重复该代码,并根据预定义的几何-电阻率组合列表对模型参数进行半自动更新。最终选定计算响应与采集的 GAFEM 数据之间误差最小的模型作为最终模型。我们将所提出的半自动试错建模方法应用于中国沂沭断裂盆地的地热资源调查。这次勘测的目的是解释地下的电阻率结构,并评估勘测区地热资源的开发潜力。在已知地质信息和 CSAMT 反演的二维模型推断出的地下地电结构以及在同一地点测量的 MT 数据的约束下,通过试错建模获得的最终模型表明存在地热资源。位于勘测线上的一个井场的钻探结果也证实了这一迹象。还对试错建模获得的模型与 GAFEM 数据集三维反演获得的模型进行了比较分析。使用相同的数据计算了视电阻率。结果表明,对于断层盆地结构,不同的方法可以获得相似的地下几何形状和电阻率分布。
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来源期刊
Geophysics
Geophysics 地学-地球化学与地球物理
CiteScore
6.90
自引率
18.20%
发文量
354
审稿时长
3 months
期刊介绍: Geophysics, published by the Society of Exploration Geophysicists since 1936, is an archival journal encompassing all aspects of research, exploration, and education in applied geophysics. Geophysics articles, generally more than 275 per year in six issues, cover the entire spectrum of geophysical methods, including seismology, potential fields, electromagnetics, and borehole measurements. Geophysics, a bimonthly, provides theoretical and mathematical tools needed to reproduce depicted work, encouraging further development and research. Geophysics papers, drawn from industry and academia, undergo a rigorous peer-review process to validate the described methods and conclusions and ensure the highest editorial and production quality. Geophysics editors strongly encourage the use of real data, including actual case histories, to highlight current technology and tutorials to stimulate ideas. Some issues feature a section of solicited papers on a particular subject of current interest. Recent special sections focused on seismic anisotropy, subsalt exploration and development, and microseismic monitoring. The PDF format of each Geophysics paper is the official version of record.
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