低阻炭质灰岩与高阻灰岩互层水文物探方法研究

炭质灰岩地层可溶性差,一次场电性呈低阻,与含水地层相比差异小,并且在低阻地层与高阻地层互层的背景下,含水信息十分模糊。本文通过二次场多参数,天然放射性探测,结合工程实例,根据低电阻率、半衰时、D参数、放射性晕形成隆起双峰异常,及点电荷电流测井,准确锁定含水带靶区,靶点,并确定含水层深度和厚度,达到找水的目的。

Study on Hydrographic Geophysical Exploration for Inter-layers Between Low Resistance Carbon Limestone and High Resistance Limestone

Because the dissolubility of carbon limestone stratum is worse,the electrical property of the first field is low resistance,which has small difference comparing with the water- bearing stratum And under the condition of low-resistance stratum and the high-resistance stratum, the content of moisture information is complex. Through the multi-parameters and the natural radioactivity exploration of the second field, this paper presents a method which can locate the target of water-bearing zone and the depth and thickness of water-bearing layer. With a project example, low electrical receptivity, half time, D-parameter, double hump abnormality of radioactivity halo,and current well logging of point charge are used to seek water.