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Ground water duplex electric testing method

A groundwater and power-connected technology, which is applied in the fields of electrical/magnetic detection for well logging records, water resource assessment, climate sustainability, etc., can solve the problem of low drilling success rate, inaccurate measurement, and influence of electrical detection. Water and other issues

Inactive Publication Date: 2010-12-15
杨佃俊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for how to eliminate the "side effect" and how to distinguish "true and false distortion", in this technical field, it has never been solved, which has caused great difficulties in the work of finding water for electrical testing
[0008] 4. Using conventional methods to find water, due to the influence of horizontal interference bodies, the misjudgment rate is high. The more the coverage is thinner in water-poor areas, the more complicated the SD curve is, and the more ubiquitous the interference bodies are, the larger the Some curves may be misjudged
In actual well drilling, it is often encountered that there is a very obvious descending section or descending curve in the SD rising curve, but there is no low-resistivity layer in the actual well drilling, and the harder it goes down, which leads to the selected well point drilling The success rate is very low, and it is generally believed that "the measurement is not accurate", which greatly affects the work of finding water by electrical measurement

Method used

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  • Ground water duplex electric testing method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0053] (1), first determine the possible water-rich section according to the geological analysis, and any measuring point O in this section is used as the sounding point:

[0054] a. If figure 1 As shown, the measuring electrodes M, N and the power supply electrodes A, B are symmetrically arranged on both sides of the measuring point O, M, N remain relatively fixed, and the power supply electrode C is located on the mid-perpendicular line of A, B, and is also located on the measuring electrode On the vertical line of M and N, the potential difference caused by C pole to M and N is O, the power supply electrodes A and B are connected to the A interface of the electric measuring instrument successively, and the measuring electrodes M and N are also connected to the electric measuring instrument M respectively. , N interface is connected, the power supply electrode C is connected to the B interface of the electrical tester, and the electrical tester is turned on for measurement....

example 1

[0068] Zhayang Village, Zhuqiao Town, Laizhou City belongs to the quartzite area. The rock is hard, the water content is low, and the static water level is 16 meters. There are more than a dozen large wells with a depth of more than 30 meters and a water output of about 20 cubic meters per day. Invention method, lay out 6 measuring points, carry out electrical measurement, as attached image 3 Shown, measuring point 1, the measured The curve is distorted at 20-25 meters, and then the measuring point is translated 5 meters in the direction of A, measuring point 2, the measured The curve distortion disappears, and the identification shows the measuring point before the translation The distortion of the line is the vertical distortion.

[0069] It is verified by actual well drilling: the rock above 26 meters is relatively broken, and the water output reaches 100 cubic meters per day and night. Continue to carry out electric survey with the inventive method, find a well dept...

example 2

[0071] as attached Figure 9 , first determine the gneiss section with good water content according to the geological analysis, take any measuring point 1 in this section as the sounding point, and conduct electrical survey, and point g at 25 meters east of this point is the distortion inflection point. Point O1 moves 5 meters to W, and the O1 curve is measured, and this inflection point is determined to be the lateral distortion inflection point. The measuring point 2 is arranged at the g point on the O1 electrical measurement curve, and the east and west curves are measured, and the 25m-30m of the E line is a distortion section. The measuring point O2 was moved eastward by a polar distance of 5 meters, and the distortion section was found to have disappeared in the O2 electrical survey curve, which proved that its nature was vertical distortion, so the well was fixed at measuring point 2.

[0072] It is verified by actual well drilling: the well depth is 50 meters, the 0-45...

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Abstract

The invention relates to a groundwater duplex electrometric method which can identify the curve distortion property accurately in a bedrock water-shortage area, fix the well location through the analysis of the electrometric curve distortion, overcome the problem of the water exploration in the bedrock area based on the symmetric-quadrupole electrometric sounding method, and effectively eliminatethe lateral impact, therefore, the duplex electrometric method has the advantages of simplicity, low misjudgment rate and greatly improved well forming rate.

Description

technical field [0001] The invention relates to a geophysical prospecting method for hydrogeological prospecting, in particular to a duplex electrical survey method for detecting groundwater, which is mainly applicable to finding out underground geological structures and rock properties in bedrock areas and searching for groundwater. Background technique [0002] Electric prospecting, referred to as electric prospecting or electric survey, is a kind of geophysical prospecting, often used in the survey of groundwater or other minerals. Resistivity sounding methods include four-pole symmetrical electric sounding, hereinafter referred to as SD method electric sounding, dipole electric sounding, three-pole electric sounding, etc. Among them, SD electric sounding is the most widely used, which was developed by the former Soviet Union in the 1930s and has rarely been improved for decades. The premise of using this method is that all kinds of rock formations are distributed in lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/20
CPCY02A90/30
Inventor 杨佃俊杨树华杨树伟
Owner 杨佃俊