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随着工农业生产的不断发展,对开发利用地下水的要求越来越迫切,为了合理地开发利用各含水层检查测量钻孔的技术情况,正确指导下管成井等工作,均须借助测井方法来完成。一、电测井方法简介:测井方法有许多种,但目前在水文地质勘探中应用最广的是电测井法。电测井法又分为两大类,一类叫做视电阻率法,即通过测量钻孔中不同地层的电阻率来划分地层及研究地层的性质;另一类叫做自然电位测井,是通过测量钻孔中孔的局围不同地层所产生的自然电位的变化,来划分含水层及咸淡水的介面。根据测井曲线划分含水砂层的方法:1.用视电阻率梯度曲线分层的方法:(1)对于高阻厚砂层曲线反应不对称,用极大与极小值划分顶底界面(见图1)(2)对于高阻薄砂层曲线基本对称用2/3幅值分层(见图2)。
With the continuous development of industrial and agricultural production, the demand for exploitation and utilization of groundwater is more and more urgent. In order to properly develop and utilize the technical conditions of each aquifer to inspect and measure the borehole, carry out. First, the electrical logging method Description: There are many logging methods, but the most widely used in hydrogeological exploration is the electrical logging method. The electrical logging method is divided into two categories, one is called the apparent resistivity method, that is, by measuring the resistivity of different strata in the borehole to divide the strata and study the nature of the strata; the other is called natural potential logging, Measure the variation of natural potentials produced by different formations in the boreholes of boreholes to define the interface between aquifer and brackish water. According to the well logging curve method of dividing the water-bearing sand layer: 1. Method of layering by apparent resistivity gradient curve: (1) For the curve reaction of sandstone layer with high resistivity and sandstone asymmetry, divide the top-bottom interface See Figure 1) (2) For the symmetrical symmetry of the high-resistivity thin sand layer, stratified by 2/3 amplitude (see Figure 2).