CSAMT与CYT联合探测法在深部盐穴储气库建设中的应用

摘要

This paper is based on the particularity in exploration of deep salt caves.The theoretical foundation, detection principle and interpretation methods of earth electric field lithology detection(CYT)and Controlled source audio magnetic telluric(CSAMT)are discussed using the Yexian salt field gas storage project in Pingdignshan.The geometry,space distribution and feedback physical information of salt caves are studied as well.Firstly,the spatial range of target body is confirme-droughly with CSAMT method.Then the spatial form is determined in detail with CYT method on the basis of CSAMT results in favorable area.Exploration results show that the spatial form of salt cave is complex.The irregular holes appear on the geological section with depth of-1000~-1400m.But the single cavern is small and the radius is about 8 ~60m.The research results can be used to guide the site selection and construction of underground salt cavern gas storage,and provide some reference for deep salt caves detection and interpretation of lithology electric fields.%针对深部盐穴探测问题的特殊性,结合平顶山叶县盐田储气工程,简要探讨了可控源音频大地电磁法(CSAMT)与大地电场岩性探测法(CYT)的理论基础、探测原理以及解译方法,并对试验区盐穴的几何形态、空间分布以及物性信息反馈特征展开了研究.首先应用 CSAMT 法进行初探,大致圈定目标体的空间范围;其次在 CSAMT 法探测结果基础上选择有利地段,采用 CYT 法进行精探,详细圈定目标体的空间形态.探测结果表明,试验区盐穴空间形态复杂,剖面上呈现不规则的空穴群,埋深大约为 -1400~-1000m;但单个溶腔体积较小,半径大致为 8~60m.研究成果可用于指导地下盐穴储气库址的选择和建设,为我国深部盐穴探测方法和电场岩性解译提供了参考.