综合物探方法在渭北地下水勘查中的应用
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摘要
渭北地处鄂尔多斯盆地南部,地质构造复杂,地层岩性多为第四系松散岩、泥岩、白云岩等,含水性较差,寻找低阻断裂构造是该区地下水勘探的唯一途径。由于地球物理解释存在多解性,因此,单一的物探方法很难确定含水层的位置。对此,采用瞬变电磁法进行剖面测量判定低阻异常位置,放射性α法来圈定蓄水构造,激电测深法来准确判定地下水所在的层位及埋深等综合物探法进行探测。此外,通过正演模型,从理论出发,验证了综合物探法联合找水的可行性。
North of Weihe River is located in southern Ordos basin, and complicated geological structure, lithology is the fourth of loose rock, mudstone, dolomite with rather poor water-bearing property and permeability, thus to find out conductive faulted structures is the only way in groundwater exploration. Due to multiplicity geophysical interpretation, it is difficult to determine where the aquifer of the single geophysical method. In this regard, the transient electromagnetic method was used to determine the location of low resistance anomaly, the radioactive α method to delineate the water storage structure, and the IP sounding method to accurately determine the stratum and depth of groundwater. In addition, the feasibility of integrated geophysical prospecting combined with water prospecting was verified theoretically by forward modeling.
North of Weihe River is located in southern Ordos basin, and complicated geological structure, lithology is the fourth of loose rock, mudstone, dolomite with rather poor water-bearing property and permeability, thus to find out conductive faulted structures is the only way in groundwater exploration. Due to multiplicity geophysical interpretation, it is difficult to determine where the aquifer of the single geophysical method. In this regard, the transient electromagnetic method was used to determine the location of low resistance anomaly, the radioactive α method to delineate the water storage structure, and the IP sounding method to accurately determine the stratum and depth of groundwater. In addition, the feasibility of integrated geophysical prospecting combined with water prospecting was verified theoretically by forward modeling.
引文
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[5]韩自强，刘涛，欧阳进，等.矩形大定源回线TEM法全区视电阻率在煤田采空区勘探中的应用[J].地球物理学进展，2015(1):343-349.
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[2]廖文鹏，朱通，黄日华，等.综合物探方法在水资源勘察中的应用[J].物探化探计算技术，2017(6):768-774.
[3]韩耀昭，辛至秀，韩逢明.氡气测量寻找基岩构造裂隙水的初步应用[J].勘察科学技术，1985(5):27-30,22..
[4]梁延广，王美岭，张彦湘.综合电法在红层地区地下水勘探中的应用[J].中国煤炭地质，2008(11):69-71.
[5]韩自强，刘涛，欧阳进，等.矩形大定源回线TEM法全区视电阻率在煤田采空区勘探中的应用[J].地球物理学进展，2015(1):343-349.
[6]冯兵，孟小红，张斌.TEM框内回线装置发射框边界影响及消除方法[J].煤田地质与勘探，2010(5):61-66.
[7]李貅.瞬变电磁测深的理论与应用[M].西安：陕西科学技术出版社，2002.