Method and device for quantifying chemical and physical erosion of rock

Abstract

The present invention discloses a method and device for quantifying chemical and physical erosion of rocks, which relates to the fields of geological science and engineering technology, and includes: Step 1, establishing a rock model with fractures by using real rocks; Step 2, detecting the parameters of the initial fractures and calculating the initial volume of the fractures; Step 3, conducting erosion tests and collecting the leachate; Step 4, calculating the volume of the chemically corroded part by detecting the amount of soluble minerals in the leachate; Step 5, recording the relevant parameters of the fractures in the final state and calculating the final volume of the fractures; Step 6, calculating the volume parameter of the physically eroded part according to the final volume of the fractures, the initial volume of the fractures and the volume of the chemically corroded part. The present invention also provides a device for quantifying chemical and physical erosion of rocks. The solution provided by the present invention realizes the purpose of quantifying chemical and physical erosion of rocks, and further can quantify the relationship between the physical erosion rate and the chemical corrosion rate of rocks.

Description

Technical Field

[0001] The present invention relates to the field of geological science and engineering technology, and particularly to a method and device for quantifying the chemical and physical erosion of rocks. Background Art

[0002] The weathering and erosion of rocks are closely related to the evolution of the topography of the earth's surface, the development of karst caves in karst areas, the durability and stability of engineering buildings, the global carbon cycle and climate change, and the release and migration of underground pollutants. Since rocks are aggregates of multiple minerals formed under complex geological processes, there are obvious differences between the strong cementation state between mineral particles and the weak cementation state between soil particles. At present, the measurement method for soil erosion mainly calculates its physical erosion rate by monitoring the change in soil volume. The degree of chemical reaction between soil particles and fluid is relatively low and is often ignored. For rocks, the erosion of rocks by the external environment (such as fluid action) is divided into two categories: physical erosion and chemical dissolution. Among them, chemical dissolution mainly refers to the chemical reaction of soluble minerals in rocks with water and carbon dioxide in the atmosphere, inducing the dissolution of rock minerals and destroying the cementation between minerals; physical erosion refers to the processes such as abrasion and migration of rock mineral particles under the shear action of fluid. Under seepage conditions, rocks will be affected by both chemical dissolution and physical erosion. At present, the measurement methods for rock erosion rate often rely on the method of scanning and reconstructing the morphology of the rock wall surface. By comparing the geometric morphology differences of the rock wall surface before and after erosion, the wall recession rate and the overall rock erosion rate are calculated. However, this method can only measure the overall rock erosion rate (including chemical dissolution and physical erosion), and it is difficult to separate the two.

[0003] Due to the significant differences in the mineral composition and distribution of different rocks, how to quickly quantify the contributions of the chemical dissolution rate and physical erosion rate of rocks to the total rock erosion rate in the laboratory is of great significance for the accurate calculation of the erosion degree in karst areas, the precise prediction of the evolution of the earth's morphology, and the time assessment of the development of underground rock leakage channels. For example, during the geological sequestration of carbon dioxide, the injected CO 2 will react with the original brine in the sequestration site to generate carbonic acid (H 2 CO 3 ), and then erode the fractured rock (CaCO 3 +H 2 CO 3 =Ca 2+ +2HCO 3 -). Currently, classical theories often only consider the chemical dissolution rate and it is difficult to accurately predict the physical erosion rate, thus underestimating the total erosion rate and resulting in potential risks in the process of CO 2 geological sequestration.

[0004] Based on this, there is an urgent need for a new solution to solve the above problems, so as to quickly quantify the chemical and physical erosion volumes of rocks in the laboratory, and then quantify the rock erosion rate, and achieve the goal of calibrating the internal relationship between the physical erosion rate and the chemical dissolution rate in different rocks. Summary of the Invention

[0005] The object of the present invention is to provide a method and device for quantifying rock chemical and physical erosion, so as to solve the problems existing in the above-mentioned prior art, quickly quantify the chemical and physical erosion volumes of rocks in the laboratory, and then quantify the rock erosion rate, and achieve the goal of calibrating the internal relationship between the physical erosion rate and the chemical dissolution rate in different rocks.

[0006] To achieve the above object, the present invention provides the following solution:

[0007] The present invention provides a method for quantifying rock chemical and physical erosion, including:

[0008] Step 1: Establish a rock model with fractures using real rocks;

[0009] Step 2: Detect the parameters of the initial fractures and calculate the initial volume of the fractures;

[0010] Step 3: Inject an erosion liquid into one end of the fracture to conduct a fracture erosion test. The erosion liquid flows out from the other end of the fracture and takes out the insoluble minerals physically eroded and the soluble minerals chemically eroded to form a dissolution liquid;

[0011] Step 4: Calculate the volume of the chemically eroded part by detecting the amount of soluble minerals in the dissolution liquid;

[0012] Step 5: Record the relevant parameters of the fracture in the final state and calculate the final volume of the fracture;

[0013] Step 6: Calculate the volume parameter of the physically eroded part according to the final volume of the fracture, the initial volume of the fracture, and the volume of the chemically eroded part.

[0014] Preferably, in Step 1, the rock model is encapsulated in a microfluidic chip, and both ends of the fracture are respectively communicated with the liquid inlet channel and the liquid outlet channel of the microfluidic chip.

[0015] Preferably, in Step 2, before encapsulating the rock model, measure the fracture length, denoted as h 0 , after encapsulation, observe the cross-sectional image of the fracture using a microscope with a camera, and collect the cross-sectional image data of the fracture into a data acquisition computer, and calculate the cross-sectional area A of the rock fracture according to the image 0 , and then obtain the initial volume of the rock fracture, denoted as V 0 = A 0 * h 0 .

[0016] Preferably, in step three, the microfluidic chip is placed on a visualization experiment platform for the fracture erosion test. An erosion liquid doped with a fluorescent agent is injected into the microfluidic chip by an injection pump to erode the rock fracture. During the injection process, the erosion liquid will erode the rock and carry out minerals. After the erosion has proceeded for a period of time Δt, the injection is stopped. Subsequently, air is injected by the injection pump to discharge all the dissolved liquids remaining in the microfluidic chip, and the discharged dissolved liquid is collected at the outlet with a liquid collection tube. A filter is arranged between the liquid collection tube and the outlet of the microfluidic chip to filter out the insoluble mineral particles of physical erosion.

[0017] Preferably, during the experiment, a data acquisition computer and an inverted fluorescence microscope are used to record the geometric structure images of the rock fractures in real time.

[0018] Preferably, in step four, an ion chromatograph is used to measure the molar amounts of various ions in the liquid collection tube. According to the molar amounts of each ion measured by the ion chromatograph and combined with the known soluble mineral composition of the rock, the molar amounts N i , where i represents the i-th mineral, and then the volume of the chemically eroded part of the rock is calculated: V chemical =∑N i ·V mol,i , V mol,i is the molar volume of the i-th mineral.

[0019] Preferably, in step five, a fluorescence microscope and a data acquisition computer are used to record the relevant parameters of the rock fracture in the final state and calculate the area A f of the rock fracture, calculate the final fracture volume V f =A f *h 0 , and then calculate the total volume V tot of the rock eroded by the acid solution = V f -V 0 *h 0 .

[0020] Preferably, in step six: calculate the physical erosion volume of the rock and establish the proportional relationship between the physical erosion and the chemical erosion volume: V physical =V tot -V chemical , C correction =V physical / V chemical .

[0021] Preferably, the chemical erosion rate, the physical erosion rate, and the total erosion rate are calculated by combining the erosion time and the erosion volume.

[0022] The present invention also provides a device for quantifying the chemical and physical erosion of rocks, including:

[0023] A liquid delivery device for delivering an erosive liquid into the fissures of a rock model;

[0024] A filter for filtering insoluble mineral particles in the erosive liquid discharged from the fissures;

[0025] An ion chromatograph for measuring the molar amount of soluble minerals in the filtered erosive liquid; and

[0026] A fissure state detection device for measuring the initial state and the final state of the fissures.

[0027] Preferably, the liquid delivery device is an injection pump; the fissure state detection device is a microscope with a camera.

[0028] The present invention has achieved the following technical effects compared with the prior art:

[0029] The solution provided by the present invention achieves the purpose of quantifying the chemical and physical erosion of rocks, and further enables the quantification of the relationship between the physical erosion rate and the chemical dissolution rate of rocks.

[0030] In addition, the present invention conducts a seepage-erosion experiment in a microfluidic model. Compared with the in-situ rock erosion experiment, this microfluidic experimental method is fast and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of a device for quantifying the chemical and physical erosion of rocks provided by an embodiment of the present invention;

[0033] In the figure: 1 - injection pump; 2 - microfluidic chip; 3 - filter; 4 - liquid collecting tube; 5 - ion chromatograph; 6 - data acquisition computer; 7 - inverted fluorescence microscope. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0035] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] As Figure 1 shown, a structural schematic diagram of a device for quantifying rock chemical and physical erosion is provided, which is used for the following method of quantifying rock chemical and physical erosion.

[0037] The present invention provides a method for quantifying rock chemical and physical erosion, including:

[0038] Step 1: Establish a rock model with fractures using real rocks;

[0039] Step 2: Detect the parameters of the initial fractures and calculate the initial volume of the fractures;

[0040] Step 3: Inject an erosion liquid into one end of the fracture for a fracture erosion test. The erosion liquid flows out from the other end of the fracture and carries out the insoluble minerals physically eroded and the soluble minerals chemically eroded to form a leachate;

[0041] Step 4: Calculate the volume of the chemically corroded part by detecting the amount of soluble minerals in the leachate;

[0042] Step 5: Record the relevant parameters of the fracture in the final state and calculate the final volume of the fracture;

[0043] Step 6: Calculate the volume parameter of the physically eroded part according to the final volume of the fracture, the initial volume of the fracture, and the volume of the chemically corroded part.

[0044] The solution provided by the present invention achieves the purpose of quantifying rock chemical and physical erosion, and further can quantify the relationship between the physical erosion rate and the chemical corrosion rate of rocks.

[0045] Using the present invention to test different rocks can achieve the goal of calibrating the internal relationship between the physical erosion rate and the chemical corrosion rate in different rocks.

[0046] In some embodiments, in Step 1, the rock model is encapsulated in the microfluidic chip 2 and both ends of the fracture are respectively communicated with the liquid inlet channel and the liquid outlet channel of the microfluidic chip 2. It can be understood that at least part of the microfluidic chip 2 is made of a transparent material to facilitate observing the change of the fracture state on the rock model outside the microfluidic chip 2.

[0047] It can be understood that the liquid inlet channel and the liquid outlet channel of the microfluidic chip 2 have interface structures to facilitate liquid inlet and outlet by connecting with pipelines.

[0048] In this embodiment, seepage-erosion experiments are carried out in a microfluidic model. Compared with in-situ rock erosion experiments, this microfluidic experimental method is fast and economical.

[0049] In some embodiments, the scheme of establishing a rock model and encapsulating the rock model in the microfluidic chip 2 can be fabricated by the method of Chinese Patent Application CN201910238487.X - A Microfluidic Chip 2 for the Study of Chemical Corrosion in Geological Processes. Before encapsulating the microfluidic chip 2, the thickness of the rock model slice, that is, the length of the crack, is measured and denoted as h. 0 Among them, the rock model in this scheme is the microfluidic chip body in Chinese Patent Application CN201910238487.X.

[0050] Specifically, the microfluidic chip 2 in this embodiment includes a microfluidic chip body (i.e., the rock model) with microchannels arranged horizontally in parallel, and also includes an upper base layer, a middle base layer, a lower base layer, an upper adhesive layer, and a lower adhesive layer; the upper base layer, the upper adhesive layer, the middle base layer, the lower adhesive layer, and the lower base layer are arranged horizontally in parallel with the chip body from top to bottom. The middle base layer horizontally penetrates the chip body and divides it into an upper half and a lower half. The upper base layer and the upper adhesive layer are both located above the middle base layer; the lower adhesive layer and the lower base layer are both located below the middle base layer; there are also a liquid injection port, a liquid outlet port, and a drainage channel (an inlet liquid channel and an outlet liquid channel) arranged horizontally in the middle base layer; the liquid injection port and the liquid outlet port both vertically penetrate the upper base layer, the upper adhesive layer, and the middle base layer, and are both communicated with the drainage channel (the inlet liquid channel and the outlet liquid channel).

[0051] Both the upper adhesive layer and the lower adhesive layer are made of ultraviolet photosensitive glue; the material of the microfluidic chip body is a rock slice.

[0052] In some embodiments, in step two, before encapsulating the rock model, the crack length is measured and denoted as h. 0 , after encapsulation, the cross-sectional image of the crack is observed by a microscope with a camera, and the cross-sectional image data of the crack is collected into the data acquisition computer 6. According to the image, the cross-sectional area A of the rock crack is calculated. 0 , and then the initial volume of the rock crack is obtained and denoted as V. 0 =A 0 *h 0 . When establishing the crack, the cross-section of the crack is set to be the same everywhere, which is beneficial to calculating the crack volume.

[0053] In some embodiments, a high-precision CT can also be used to replace the microscope with a camera to detect the cross-sectional image information of the crack.

[0054] In some embodiments, in step three, the microfluidic chip 2 is placed on a visualization experiment platform for a fracture erosion test. An erosion liquid doped with a fluorescent agent is injected into the microfluidic chip 2 by an injection pump 1 to erode the rock fracture. During the injection process, the erosion liquid will erode the rock and carry out minerals. When the erosion has proceeded for a period of time △t, the injection is stopped. Subsequently, air is injected by the injection pump 1 to discharge all the dissolved solutions remaining in the microfluidic chip 2, and the discharged dissolved solution is collected at the outlet with a liquid collecting tube 4. A filter 3 is arranged between the liquid collecting tube 4 and the outlet of the microfluidic chip 2 to filter out insoluble mineral particles of physical erosion. During the experiment, a data acquisition computer 6 and an inverted fluorescence microscope 7 are used to record the geometric structure images of the rock fracture in real time.

[0055] In some embodiments, in step four, an ion chromatograph 5 is used to measure the molar amounts of various ions in the liquid collecting tube 4. According to the molar amounts of each ion measured by the ion chromatograph 5, combined with the known soluble mineral composition of the rock, the molar amounts Ni of various soluble minerals are analyzed, where i represents the i-th mineral. Furthermore, the volume of the chemically eroded part of the rock is calculated: Vchemical = ∑Ni·Vmol,i, where Vmol,i is the molar volume of the i-th mineral. In some embodiments, the measurement of the concentrations or molar amounts of various ions in the liquid collecting tube 4 can also be changed to detect by measuring the pH. However, the accuracy of pH measurement will be affected by external conditions. By measuring the pH to first measure the amount of hydrogen ions, and then calculating the total amounts of calcium, magnesium and other ions, and further calculating the volume of the chemically eroded part of the rock.

[0056] In some embodiments, in step five, a fluorescence microscope and a data acquisition computer 6 are used to record the relevant parameters of the rock fracture in the final state and calculate the area A of the rock fracture f , calculate the final fracture volume V f = A f * h 0 , and further calculate the total volume V of the rock eroded by the acid solution tot = V f - V 0 * h 0 .

[0057] In some embodiments, in step six: calculate the physical erosion volume of the rock and establish a proportional relationship between the physical erosion and the chemical erosion volume: V physical = V tot - V chemical , C correction = V physical / V chemical .

[0058] In some embodiments, the chemical erosion rate, the physical erosion rate and the total erosion rate are calculated by combining the erosion time and the erosion volume.

[0059] Combining the above multiple embodiments, the present invention provides the following more preferred embodiments:

[0060] S1: Prepare the real rock microfluidic chip 2. Use the method in the patent (a method for a microfluidic chip 2 for studying chemical dissolution in geological processes, CN201910238487.X) to fabricate an erodible microfluidic chip 2. Measure the thickness of the rock model slice before encapsulating the microfluidic chip 2, denoted as h 0 .

[0061] S2: Record the relevant parameters of the rock fracture in the initial state: Use an inverted fluorescence microscope 7 with a high-resolution camera to observe the initial geometric structure of the rock fracture, and collect the image data into the data acquisition computer 6. Calculate the area A of the rock fracture according to the image 0 , and then obtain the initial volume of the rock fracture, denoted as V 0 = A 0 * h 0 .

[0062] S3: Conduct a rock fracture seepage-erosion experiment using a visualization experimental platform. Use an injection pump 1 to inject dilute hydrochloric acid into the microfluidic chip 2 to erode the rock fracture. During the injection process, the dilute hydrochloric acid will erode the rock and carry out minerals. After the erosion has proceeded for a period of time △t, stop the injection. Then use the injection pump 1 to inject air to discharge all the solution remaining in the chip, and collect the discharged dissolved solution at the outlet with a liquid collecting tube 4. Place a filter 3 in front of the liquid collecting tube 4 to filter out the insoluble mineral particles of physical erosion. During the experiment, use the data acquisition computer 6 and the inverted fluorescence microscope 7 to record the geometric structure images of the rock fracture in real time.

[0063] S4: Use an ion chromatograph 5 to measure the molar amounts of various ions in the liquid collecting tube 4. According to the molar amounts of each ion measured by the ion chromatograph 5, analyze the molar amounts N i (i represents the i-th mineral) of various soluble minerals in combination with the known soluble mineral composition of the rock, and then calculate the volume of the chemically eroded part of the rock: V chemical = ∑N i · V mol,i , V mol,i is the molar volume of the i-th mineral.

[0064] S5: Record the relevant parameters of the rock fracture in the final state: Use the data acquisition computer 6 and the inverted fluorescence microscope 7 to record the geometric structure image of the rock fracture, calculate the area A of the rock fracture f , calculate the final volume V f = A f * h 0 , and then calculate the total volume V tot of the rock eroded by the acid solution = V f-V 0 *h 0 。

[0065] S6: Calculate the physical erosion volume of the rock and establish the connection between the physical erosion and the chemical dissolution volume: V physical = V tot -V chemical , C correction = V physical / V chemical 。

[0066] The present invention also provides a device for quantifying the chemical and physical erosion of rocks to implement the method for quantifying the chemical and physical erosion of rocks in the above embodiments, including: a liquid delivery device, a filter 3, an ion chromatograph 5, and a fracture state detection device.

[0067] Among them, the liquid delivery device is used to deliver the erosion liquid into the fractures of the rock model; the liquid delivery device is preferably an injection pump 1.

[0068] The filter 3 is used to filter the insoluble mineral particles in the erosion liquid discharged from the fractures.

[0069] The ion chromatograph 5 is used to measure the molar amount of soluble minerals in the filtered erosion liquid.

[0070] The fracture state detection device is used to measure the initial state and the final state of the fractures. The fracture state detection device is preferably a microscope with a camera.

[0071] The present invention is described in detail below through embodiments, but the protection scope of the present invention is not limited to the following description. Without special instructions, the experimental methods used are conventional experimental methods; the reagents and materials used can be obtained through commercial channels. Carbonate rocks (mainly including limestone, dolomite, etc.) are one of the most widely distributed sedimentary rocks on the earth's surface. The erosion rate of carbonate rocks has an important impact on the evolution of karst landforms and the development of karst caves, the migration of groundwater pollutants, the global carbon cycle, and climate change. In the following embodiments, carbonate rocks are used as samples to quantify the physical erosion during the seepage-erosion process.

[0072] S1: Prepare the carbonate rock microfluidic chip 2. The main minerals of carbonate rocks are soluble minerals such as calcite (CaCO 3 ), magnesite (MgCO 3 ), etc., and insoluble minerals such as quartz and clay. Use the method in the patent (a method for a microfluidic chip 2 for studying chemical dissolution in geological processes, CN201910238487.X) to make the erodible microfluidic chip 2. Place the polished carbonate rock slice in the microfluidic chip 2. Measure the thickness of the rock slice before encapsulating the microfluidic chip 2, denoted as h 0 = 0.2 mm.

[0073] S2: Record the relevant parameters of the rock fracture in the initial state: Use an inverted fluorescence microscope 7 (ZEISS Axio Observer) with a high-resolution camera (Axiocam305color) to observe the initial geometric structure of the rock fracture, and collect the image data into the data acquisition computer 6. Calculate the area A of the rock fracture based on the image. 0 = 0.64 mm 2 Furthermore, obtain the initial volume of the rock fracture, denoted as V. 0 = A 0 * h 0 = 0.128 mm 3 .

[0074] S3: Conduct a rock fracture seepage-erosion experiment using a visualization experimental platform. Use an injection pump 1 to inject dilute hydrochloric acid (pH = 1) into the microfluidic chip 2 at a flow rate of Q = 1 mm 3 / min to erode the rock fracture. During the injection process, the dilute hydrochloric acid will erode the rock and carry out the minerals. After the erosion has proceeded for a period of time Δt (10 min), stop the injection. Then, use the injection pump 1 to inject 2 mL of air to discharge all the solutions remaining in the chip, and collect the discharged eluate at the outlet with a collecting tube 4. A filter 3 (filter diameter 0.1 μm) is placed in front of the collecting tube 4 to filter out the insoluble mineral particles (particle diameter greater than 0.1 μm) of physical erosion. During the experiment, use the data acquisition computer 6 and the inverted fluorescence microscope 7 to record the geometric structure images of the rock fracture in real time.

[0075] S4: Measure the molar amounts of various ions in the collecting tube 4 using an ion chromatograph 5 (Metrohm Eco IC). Based on the molar amounts of each ion measured by the ion chromatograph 5, analyze the molar amount N of calcite in combination with the known soluble mineral composition of the rock. CaCO3 = 3.2×10 -3 mmol, N MgCO3 = 1.1×10 -3 mmol, and then calculate the volume of the chemically eroded part of the rock: V chemical = 3.2×10 -3 mmol × 36.93 mm 3 / mmol + 1.1×10 -3 mmol × 28.10 mm 3 / mmol = 0.118 mm 3 + 0.031 mm 3 = 0.149 mm 3 , where 36.93 mm 3 / mmol is the molar volume of CaCO 3 , and 28.10 mm3 / mmol is the molar volume of MgCO 3 .

[0076] S5: Record the relevant parameters of the rock fractures in the final state: Use the data acquisition computer 6 and the inverted fluorescence microscope 7 to record the geometric structure images of the rock fractures, and calculate the area A of the rock fractures f = 1.62 mm 2 , calculate the initial volume image V f = A f * h 0 = 0.324 mm 3 , and then calculate the total volume V of the rock eroded by the acid solution tot = V f - V 0 × h 0 = 0.196 mm 3 .

[0077] S6: Calculate the physical erosion volume of the rock and establish the relationship between the physical erosion and chemical dissolution volumes: V physical = V tot - V chemical = 0.047 mm 3 , C correction = V physical / V chemical = 39.8%. This test takes a short time, and the accuracy of the erosion rate measurement can be improved by the method of taking the average value through multiple measurements.

[0078] In the present invention, specific examples are used to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for quantifying chemical and physical erosion of rocks, characterized by: include: Step 1: Use real rocks to build a rock model with cracks; Step 2: Detect the parameters of the initial crack and calculate the initial volume of the crack; Step 3: injecting erosion liquid into one end of the fissure to conduct a fissure erosion test, and the erosion liquid flows out from the other end of the fissure and takes out the insoluble minerals removed by physical erosion and the soluble minerals removed by chemical erosion to form a dissolution solution; Step 4: calculating the volume of the chemically dissolved part by detecting the amount of soluble minerals in the dissolution solution; Step 5, record the relevant parameters of the crack in the final state and calculate the final volume of the crack; Step 6: Calculate the volume parameters of the physically eroded part according to the final volume of the crack, the initial volume of the crack and the volume of the chemically eroded part; The chemical erosion rate, physical erosion rate and total erosion rate are calculated by combining the erosion time and erosion volume.

2. The method for quantifying chemical and physical erosion of rocks according to claim 1, characterized in that: In step 1, the rock model is encapsulated in a microfluidic chip and the two ends of the crack are connected to the liquid inlet channel and the liquid outlet channel of the microfluidic chip respectively.

3. The method for quantifying chemical and physical erosion of rocks according to claim 2, characterized in that: In step 2, the length of the crack is measured before packaging the rock model, which is recorded as h0. After packaging, a microscope with a camera is used to observe the cross-sectional image of the crack, and the cross-sectional image data of the crack is collected into a data acquisition computer. The cross-sectional area A0 of the rock crack is calculated based on the image, and the initial volume of the rock crack is obtained, which is recorded as V0=A0*h0.

4. The method for quantifying chemical and physical erosion of rocks according to claim 2, characterized in that: In step three, the microfluidic chip is placed on a visualization experimental platform to carry out a fissure erosion test. An erosion liquid doped with a fluorescent agent is injected into the microfluidic chip by a syringe pump to erode the rock fissures. During the injection process, the erosion liquid will erode the rock and take out the minerals. After the erosion has been going on for a period of time △t, the injection is stopped. Subsequently, air is injected by a syringe pump to discharge all the dissolved liquid remaining in the microfluidic chip, and the discharged dissolved liquid is collected by a collecting tube at the outlet. A filter is set between the collecting tube and the outlet of the microfluidic chip to filter out the insoluble mineral particles caused by physical erosion.

5. The method for quantifying chemical and physical erosion of rocks according to claim 4, characterized in that: In step 4, the molar amount of various ions in the collecting tube is measured by an ion chromatograph. The molar amount of various soluble minerals N is analyzed based on the molar amount of each ion measured by the ion chromatograph and the known soluble mineral composition of the rock. i , i represents the i-th mineral, and then calculate the volume of the chemically dissolved part of the rock: V chemical =∑N i ·V mol,i , V mol,i is the molar volume of the ith mineral.

6. The method for quantifying chemical and physical erosion of rocks according to claim 4, characterized in that: In step 5, the relevant parameters of the rock cracks in the final state are recorded using a fluorescence microscope and a data acquisition computer and the area A of the rock cracks is calculated. f , calculate the final fracture volume V f =A f *h0, and then calculate the total volume V of the rock corroded by the acid tot =V f -V0*h0.

7. The method for quantifying chemical and physical erosion of rocks according to claim 6, characterized in that: Step 6: Calculate the physical denudation volume of the rock and establish the proportional relationship between the physical denudation volume and the chemical dissolution volume: V physical =V tot -V chemical , C correction =V physical / V chemical .

8. A rock chemical and physical erosion quantification device, used to implement the rock chemical and physical erosion quantification method according to any one of claims 1 to 7, characterized in that: include: a liquid delivery device for delivering erosion liquid into the cracks of the rock model; A filter for filtering insoluble mineral particles in the erosion liquid discharged from the fissure; an ion chromatograph for measuring the molar amount of soluble minerals in the filtered erosion liquid; as well as The crack state detection device is used to measure the initial state and final state of the crack.

9. The device for quantifying chemical and physical erosion of rocks according to claim 8, characterized in that: The liquid delivery device is a syringe pump; the crack state detection device is a microscope with a camera.

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