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地层和电阻率约束反演在神居山地区地热资源勘查中的应用研究

Application research on stratigraphy and resistivity-constrained inversion in geothermal resource exploration of the Shenjushan Area

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【作者】 李琳季克其王军成高士银

【Author】 LI Lin;JI Ke-qi;WANG Jun-cheng;GAO Shi-yin;Jiangsu Institute of Geological Exploration Technology;Jiangsu Engineering Research Center for Aviation Geophysical Survey and Intelligent Perception;Jiangsu Geological Survey Institute;

【机构】 江苏省地质勘查技术院江苏省航空对地探测与智能感知工程研究中心江苏省地质调查研究院

【摘要】 目前地热资源的勘探主要集中在中深部、深部,而地球物理方法在分辨率和探测深度上存在一定的相悖性,特别是在覆盖层较厚、热储埋深较大的地区,地热资源的勘探难度也进一步增大。不同的物探方法在勘探精度、勘探深度、生产成本等方面均存在一定的优势,加之物探成果往往具有多解性,这就要求地热资源勘探要通过多种勘探技术和反演方法综合分析来提高勘探的精度。以神居山地热资源勘查为例,建立以微动分层为基础、以大地电磁和音频大地电磁电阻率为填充的地电模型,并代入实测的CSAMT法和WFEM法实测数据进行反演,提高了反演精度和近场数据的利用率,在一定程度上优化了勘探数据,减少了反演的多解性,提高了勘探成果的可靠性;最终建立了一套适用于中深部和深部的约束反演流程体系,为地热资源勘探提供了可靠的科学依据。

【Abstract】 Current geothermal resources exploration primarily focuses on medium-deep and deep formations. Geophysical methods,however,exhibit a certain trade-off between resolution and detection depth. This challenge is particularly pronounced in areas with thick overburden and significant geothermal reservoir burial depth,where exploration difficulty increases substantially. Different geophysical exploration methods each possess distinct advantages in terms of accuracy,depth capability,and production costs. Furthermore,geophysical exploration results are often characterized by a multi-solution nature of inversion. Consequently,improving exploration accuracy necessitates a comprehensive analysis employing multiple exploration technologies and inversion methods. Taking the geothermal resources exploration in the Shenju Mountain area as an example,a geoelectric model was established based on microtremor stratification,supplemented by magnetotelluric and audio magnetotelluric resistivity data. This model was then used for inversion with measured data from the CSAMT method and the WFEM method. This approach enhanced the inversion accuracy and improved the utilization of near-field data,thereby optimizing the exploration data to some extent,reducing the multi-solution of inversion,and increasing the reliability of the exploration results. Ultimately,a constrained inversion process system suitable for medium-deep and deep formations was developed,providing a reliable scientific basis for geothermal resources exploration.

【基金】 江苏省地质局科研基金项目“综合物探技术在江苏省构造裂隙型地热资源勘查中的应用研究”(2021KY16),江苏省地质局科研基金项目“综合物探技术在苏北新生代断陷盆地地热资源勘查中的应用研究”(2022KY13)
  • 【分类号】P314
  • 【下载频次】9
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