音频大地电磁测深法在青海才尔贡玛地区煤炭普查中的应用

The Application of Audio Terrestrial Electromagnetic Sounding in the Coal Survey in Qinghai Caiergongma Area

为研究才尔贡玛地区含煤地层并指导钻探工程的施工,在该地区通过开展音频大地电磁测深工作,初步了解研究区含煤地层分布范围、埋藏深度及煤层赋存地段,重点研究区内断裂构造体系。结果表明:侏罗系含煤地层整体以断块的形式存在,在音频大地电磁测深二维反演断面图上呈现为高电阻率,通过圈定异常靶区及钻探工程验证,发现了一层可采煤层,验证结果与反演推断解释相吻合,取得了较好的应用效果。

In order to study the coal bearing situation and guide the construction of drilling engineering in Ceiergonma area,the distribution range of coal bearing strata,burial depth and occurrence area of coal seam in the study area were preliminarilly understood through audio frequency magnetotelluric sounding in the area,and the structural framework of the study area was identified,the location of the fault was demarcated,and the nature of the fault was determined.The coal seams in F4 and F5 discontinuous blocks in the study area were explained and inferred,and the fault structural system in the study area is studied.The results show that the Jurassic coal-bearing strata as a whole exist in the form of fault blocks and show high resistivity on the 2d inversion section of audio magnetotelluric sounding.Through delineating abnormal target areas and drilling engineering verification,a layer of coal seam is found.The verification results are consistent with the inversion inference interpretation,and good application effect has been achieved.