太行山片麻岩基岩裂隙富水性的激电衰减参数特征——以阜平县为例

Induced polarization damping parameter characteristics of water yield property in gneiss rock fissure of Taihang mountains

为研究太行山片麻岩基岩裂隙富水性和激电衰减参数之间的对应关系,依据区域地质资料,分析了阜平县某研究区的水文地质特征,总结了片麻岩基岩裂隙水的赋存规律。利用激电法获取了半衰时、衰减度和偏离度等激电衰减参数。分析了片麻岩基岩裂隙水富水性的激电衰减参数特征,估计了地下水的富水性,并布置地质钻孔验证了基岩裂隙水富水性与激电衰减参数特征之间的对应程度。结果表明:半衰时和衰减度越大、偏离度越小,片麻岩基岩裂隙水富水性更为优越;半衰时分布在960～1600ms、衰减度分布在35～48%,以及偏离度分布在4. 8%以下,研究区片麻岩基岩裂隙水富水性较为优越;不同片麻岩基岩裂隙水分布区的水文地质特征不同,激电衰减参数值分布范围各异;相比电阻率和极化率,激电衰减参数的分辨率和准确度均有较大程度的提高,效果可靠,在条件类似的片麻岩基岩裂隙水分布区具有很强意义的示范性。

For purpose of understanding the correspondence between water yield property of gneiss rock fissure and induced polarization damping parameters in Taihang,hydrogeological characteristics of a research area in Fuping County were analyzed,and assignment law of gneiss bedrock fissure water was summarized with regional geologic data.Half damping time,damping degree and deviation degree were acquired by induced polarization method.Induced polarization damping parameters characteristics of water yield property in gneiss rock fissure water were analyzed,and water yield property was evaluated.Geology drill was distributed to test and verify their degree of equivalence.The results showed that with increase of half damping time and damping degree,water yield property of gneiss rock fissure water became superior accompanied by decreasing deviation degree;water yield property of gneiss rock fissure water increased with half damping time in 960 ~ 1600 ms,damping degree in35 ~ 48% and deviation degree less than 4.8% in the research area;with different hydrogeological characteristics in distributions of gneiss rock fissure water,the ranges of induced polarization damping parameters varied;in comparison with resistivity and polarization,the resolution and accuracy of induced polarization damping parameters enhanced with reliable effect,and it was a representative example in gneiss rock fissure water area with similar conditions.