A method for quickly calculating the permeability coefficient of aquifer

Abstract

The present invention discloses a method for quickly obtaining the permeability coefficient of an aquifer, comprising: obtaining a position to be measured; obtaining relevant data of the position to be measured based on the position to be measured; calculating the permeability coefficient of the formation based on the relevant data; and calculating the permeability coefficient of the aquifer based on the permeability coefficient of the formation. The present invention can quickly, conveniently and surely obtain the permeability coefficient K value of the aquifer, solving the problems of the traditional pumping test for solving the permeability coefficient, which is time-consuming, cumbersome, wasteful of groundwater resources, and complex calculation. The method can obtain the permeability coefficients of different lithologies in the aquifer, improving the efficiency of solving the permeability coefficient.

Description

Technical Field

[0001] The invention belongs to the field of groundwater resources in water resources, and in particular relates to a method for quickly obtaining aquifer permeability coefficient. Background Art

[0002] Groundwater is the world's largest freshwater resource and is rapidly depleting. The long-term over-exploitation of groundwater resources in the northern region to maintain economic and social development has caused a continuous decline in regional groundwater levels, forming a large area of ​​shallow / deep groundwater level drop funnels. The first prerequisite for scientific management of groundwater over-exploitation is to understand the recharge, runoff and discharge rules of aquifers. The lateral recharge and discharge of aquifers are an indispensable part of it, and the key to evaluating lateral runoff is the permeability coefficient parameter of the aquifer. Secondly, the management department needs to quickly and accurately obtain the changes in groundwater reserves in the regional aquifers. The key parameter for evaluating the changes in groundwater reserves is also the permeability coefficient of the aquifer. Thirdly, the structural damage of the aquifer caused by groundwater over-exploitation directly affects the permeability coefficient of the aquifer, resulting in the invalidation of the parameters obtained in previous research work. Finally, aquifers often contain different lithological strata, including fine, medium and coarse sand layers, sandy clay layers, etc. The permeability coefficients of different lithological strata are different.

[0003] The permeability coefficient of existing aquifers is obtained by pumping tests. According to the principle of groundwater dynamics, the main pumping wells are divided into complete wells and incomplete wells, and the pumping methods are divided into single well pumping and group well pumping, steady flow pumping and unsteady flow pumping, single drop and three drop. The main pumping well and observation well monitor the water level changes in the well. The entire pumping test process is complicated and time-consuming. In addition, the parameter obtained is the permeability coefficient of the entire aquifer, and the permeability coefficients of different lithologies in the aquifer cannot be obtained. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a method for quickly obtaining the permeability coefficient of an aquifer. The method for obtaining the permeability coefficient of an aquifer in the present invention is different from obtaining parameters in previous pumping tests, and is simple, fast, has low uncertainty, and consumes less time.

[0005] To achieve the above object, the present invention provides a method for quickly obtaining the permeability coefficient of an aquifer, comprising:

[0006] Get the position to be measured;

[0007] Based on the position to be measured, obtaining relevant data of the position to be measured;

[0008] Based on the relevant data, calculating the formation permeability coefficient;

[0009] Based on the formation permeability coefficient, the aquifer permeability coefficient is calculated.

[0010] Optionally, the locations to be measured include: groundwater level detection wells and flow velocity and direction observation wells.

[0011] Optionally, based on the position to be measured, acquiring relevant data of the position to be measured includes:

[0012] Based on the position to be measured, a formation lithology flow velocity and direction observation test is carried out;

[0013] Based on the formation lithology flow velocity and direction observation test, relevant data of the position to be measured is obtained.

[0014] Optionally, the stratum includes: a fine sand layer, a medium sand layer, a coarse sand layer and a sandy clay layer.

[0015] Optionally, the relevant data include: flow velocity and direction data and monitoring well water level data.

[0016] Optionally, the method for calculating the formation permeability coefficient is:

[0017]

[0018] Where K is the formation permeability coefficient, V 达 is the Darcy velocity, L is the horizontal distance between the two wells, and H1 and H2 represent the groundwater levels in groundwater wells 1 and 2, respectively.

[0019] Optionally, the method for calculating the permeability coefficient of the aquifer is:

[0020] K 含 =K1×h1+…Kn×hn / h

[0021] Among them, K 含 is the permeability coefficient of the aquifer, K1,…Kn are the permeability coefficients of different lithological strata, h1,…,hn are the thicknesses of different lithological strata, and h is the total thickness of the aquifer.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects:

[0023] The present invention can quickly, conveniently and accurately obtain the permeability coefficient K value of the aquifer, solving the problems of the traditional pumping test for solving the permeability coefficient, which is time-consuming, cumbersome, wasteful of groundwater resources and complex calculation. The permeability coefficients of different lithologies in the aquifer can be obtained, thus improving the efficiency of solving the permeability coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1This is a flow chart of a method for quickly obtaining the permeability coefficient of an aquifer according to an embodiment of the present invention;

[0026] Figure 2 A diagram showing the aquifer profile and monitoring well locations of an embodiment of the present invention;

[0027] Figure 3 This is a graph showing the results of an intelligent groundwater flow velocity and direction test according to an embodiment of the present invention;

[0028] Figure 4 This is a plan location diagram of a groundwater well according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0031] The present invention proposes a method for quickly obtaining the permeability coefficient of an aquifer. Figure 1 As shown, the specific steps include:

[0032] Get the position to be measured;

[0033] Based on the position to be measured, obtaining relevant data of the position to be measured;

[0034] Based on the relevant data, calculate the formation permeability coefficient;

[0035] Based on the formation permeability, calculate the aquifer permeability.

[0036] Furthermore, the locations to be tested include: groundwater detection wells and flow velocity and direction observation wells.

[0037] Furthermore, based on the position to be measured, obtaining relevant data of the position to be measured includes:

[0038] Based on the location to be tested, conduct formation lithology flow velocity and direction observation tests;

[0039] Based on the formation lithology, flow velocity and direction observation test, relevant data of the location to be tested are obtained.

[0040] Furthermore, the stratum includes: a fine sand layer, a medium sand layer, a coarse sand layer and a sandy clay layer.

[0041] Specifically, Figure 2As shown in the figure, a certain aquifer contains fine sand layer, medium sand layer, coarse sand layer and sandy clay layer, and groundwater flows from well 1 to well 2. The water levels are H1 and H2 respectively, and the distance is L. H1 and H2 represent the groundwater levels in groundwater wells 1 and 2 respectively (m), and L represents the horizontal distance between wells 1 and 2 (m).

[0042] Furthermore, the relevant data include: flow velocity and direction data and monitoring well water level data.

[0043] Specifically, if there is another groundwater well in the line connecting Well 1 and Well 2, and the groundwater flow direction is consistent with the direction of the line, it is necessary to place intelligent groundwater flow velocity and direction monitors in different lithological strata. After 10 minutes of stillness, start observing the colloid movement in the water. The observation time is about 20 minutes. The samples obtained can represent the actual flow velocity V of the water in the well. The test results are as follows: Figure 3 As shown, the flow velocity in the groundwater well is 1.289 m / d and the flow direction is 167.0°.

[0044] Furthermore, the method for calculating the formation permeability coefficient is:

[0045] The Darcy velocity V in the lithologic formation is the actual velocity multiplied by the effective porosity of the formation, as shown in the following formula:

[0046] V 达 =V 实 ×n

[0047] n is the effective porosity of different lithological formations.

[0048] The permeability coefficient K of different lithology formations can be directly solved according to Darcy's law, as shown in the following formula:

[0049]

[0050] Where K is the formation permeability coefficient, V 达 is the Darcy velocity, L is the horizontal distance between the two wells, and H1 and H2 represent the groundwater levels in groundwater wells 1 and 2, respectively.

[0051] Furthermore, the method for calculating the permeability coefficient of the aquifer is:

[0052] The permeability coefficient of the aquifer can be obtained by weighting the permeability coefficients of different lithological formations as follows:

[0053] K 含 =K1×h1+…Kn×hn / h

[0054] Among them, K 含 is the permeability coefficient of the aquifer, K1,…Kn are the permeability coefficients of different lithological strata, h1,…,hn are the thicknesses of different lithological strata, and h is the total thickness of the aquifer.

[0055] When there is no suitable groundwater well between well 1 and well 2, you can find a groundwater well nearby. Figure 4 As shown, the groundwater flow rate tested in the groundwater observation well needs to be converted to flow direction, as shown in the following formula:

[0056] Vreal'=Vreal×cosθ

[0057] Where Vreal' is the flow velocity between well 1 and well 2.

[0058] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for quickly obtaining the permeability coefficient of an aquifer, characterized in that: include: Get the position to be measured; Based on the position to be measured, obtaining relevant data of the position to be measured; Based on the relevant data, calculating the formation permeability coefficient; When there is another groundwater well in the line connecting Well 1 and Well 2, and the groundwater flow direction is consistent with the direction of the line, it is necessary to place intelligent groundwater flow velocity and direction monitors at different lithological strata. The samples obtained can represent the actual flow velocity Vreal of the water in the well. When there is no groundwater well in the middle of the straight line connecting Well 1 and Well 2, a groundwater well can be found nearby, and the groundwater flow velocity tested in the groundwater observation well needs to be converted; The method for calculating the formation permeability coefficient is: The Darcy velocity V in the lithologic formation is equal to the actual velocity multiplied by the effective porosity of the formation, as shown in the following formula: V 达 =V 实 ×n n is the effective porosity of different lithological formations; The permeability coefficient K of different lithology formations can be directly solved according to Darcy's law, as shown in the following formula: Where K is the formation permeability coefficient, V 达 is the Darcy velocity, L is the horizontal distance between the two wells, H1 and H2 represent the groundwater levels in groundwater well 1 and well 2, respectively; Calculating the permeability coefficient of the aquifer based on the formation permeability coefficient; The method for calculating the permeability coefficient of the aquifer is: K 含 =K1×h1+…Kn×hn / h Among them, K 含 is the permeability coefficient of the aquifer, K1,…Kn are the permeability coefficients of different lithological strata, h1,…,hn are the thicknesses of different lithological strata, and h is the total thickness of the aquifer.

2. A method for quickly obtaining the permeability coefficient of an aquifer according to claim 1, characterized in that: The locations to be measured include: a groundwater level detection well and a flow velocity and direction observation well.

3. The method for quickly obtaining the permeability coefficient of an aquifer according to claim 1, characterized in that: Based on the position to be measured, obtaining relevant data of the position to be measured includes: Based on the position to be measured, a formation lithology flow velocity and direction observation test is carried out; Based on the formation lithology flow velocity and direction observation test, relevant data of the position to be measured is obtained.

4. A method for quickly obtaining the permeability coefficient of an aquifer according to claim 3, characterized in that: The stratum comprises a fine sand layer, a medium sand layer, a coarse sand layer and a sandy clay layer.

5. The method for quickly obtaining the permeability coefficient of an aquifer according to claim 1, characterized in that: The relevant data include: flow velocity and direction data and monitoring well water level data.

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