巨厚新生界覆盖区煤炭勘查中的电震综合方法应用

The application of the comprehensive electric and seismic method to coal exploration in the huge Cenozoic coverage area

巨厚新生界对电磁波和地震波的吸收衰减作用强烈,单一方法难以达到煤炭勘查的目的。在宁夏香山西麓某巨厚新生界覆盖区煤炭勘查中,投入的二维地震勘探未能达到预期目的,补充实施了以可控源音频大地电磁法为主、直流电测深为辅的电法勘探,组成的综合方法成功圈定了含煤地层的范围,确定了含煤地层的含煤性。通过钻探验证和后续地质勘查工作,证明了电震综合方法在巨厚新生界覆盖区煤炭勘查中的经济性和有效性。

The huge Cenozoic sediments have a strong absorption and attenuation effect on electromagnetic waves and seismic waves,and it is difficult for a single method to achieve the purpose of coal exploration.In the coal exploration of a huge Cenozoic coverage area at the western foot of the Xiangshan Mountain in Ningxia,the investment in 2 D seismic exploration failed to achieve the expected purpose.In this study,the electrical method with controlled source audio magnetotelluric method as the main and direct current sounding as the supplementary method was implemented for exploration.The comprehensive method successfully delineated the range of coal-bearing strata and determined the coal-bearing nature of the coal-bearing strata.Through drilling verification and subsequent geological survey work,the comprehensive method of electro-seismic was proved to be economical and effective in coal prospecting in the area covered with huge Cenozoic sediments.