Device and method for measuring and calculating content of gravel-grade particles in rock slice

Abstract

The invention relates to the technical field of rock slice identification methods, in particular to a device and method for measuring and calculating the content of gravel-grade particles in rock slices. Comprising a hollow transparent box body, a containing cavity is formed in the box body, a separating device is movably arranged in the box body and divides the containing cavity into a measuring cabin cavity and a magnetic powder cabin cavity, and the measuring cabin cavity and the magnetic powder cabin cavity are arranged side by side in the vertical direction; one end of the separating device extending out of the box body is connected with the box body through a locking device; the magnetic powder is used for copying all areas of particles in any shape in a one-to-one mode, and limitation of the shapes of the particles is avoided; after all the gravel-grade particles are copied, the areas of all the gravel-grade particles are rapidly measured and calculated after the magnetic powder in the measuring cabin cavity is shaken to be in a regular shape, namely, the irregular area is rapidly converted into the regular area for convenient calculation; the overall precision is high, and convenience and rapidness are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of rock slice identification methods, and in particular to a device and method for measuring gravel-grade particle content in rock slices. Background Art

[0002] Rock debris particles are categorized by particle size, including both gravel-sized (≥2 mm) and sand-sized (<2 mm). Rock thin section identification complies with the People's Republic of China Petroleum and Natural Gas Industry Standard "SY / T 5368-2016 Rock Thin Section Identification," 6.1.6.4 d) and 6.1.7.3, both of which stipulate that clastic rocks should be designated based on their gravel content, including gravelly sandstone, gravelly sandstone, conglomerate, sandy conglomerate, and sandy conglomerate. These different rock types correspond to varying reservoir heterogeneities, requiring different development methods and drill bit types during subsequent oil and gas production. Therefore, quantitative analysis of gravel-sized debris particles in rock thin sections plays a crucial role in determining rock lithology, accurately understanding reservoir heterogeneity, and selecting subsequent oil and gas development and drilling strategies. It is an essential component of the exploration and development of clastic oil and gas reservoirs.

[0003] The prior art invention, "Device and Method for Counting Granular Particle Content in Rock Thin Sections," describes a device that utilizes a bracket to secure a transparent plate with multiple equally divided grids to a computer screen. The thin section is then placed under an optical microscope for examination, producing a photograph of the section. This photograph is then opened on a computer connected to the microscope, and the device for counting granular particle content in the rock thin section is secured to the computer screen. The specific method for counting granular particle content involves identifying different types of target particles using the thin section photographs, classifying the target particles into multiple categories, and then performing grid marking and counting. If a target particle is completely covered by a grid, the grid is considered valid and marked. If a target particle is not covered by a grid but occupies more than 1 / 2 of the grid area, it is also considered a valid grid and marked. If a target particle is covered by a grid but less than 1 / 2 of the grid area, the grid is considered invalid and discarded. After marking, the markings are counted.

[0004] 1) Because most rock particles are irregular in shape, existing techniques primarily use a square grid to mark target particles. This allows for the complete calculation of the area of ​​particles that fully occupy a single square grid. However, for irregular areas that do not completely fill a single square grid, if the area exceeds 1 / 2 of the grid area, this technique considers the grid to be valid, resulting in a higher calculated area than the actual area. If the area is less than 1 / 2 of the grid area, the technique considers the grid to be invalid and discards it. This irregular area is not included in the calculation, resulting in a lower calculated result than the actual area. Consequently, this technique results in significant errors in the area calculation of irregularly shaped particles. The core issue is that when a thin rock slice contains multiple irregularly shaped particles, it is impossible to accurately calculate the actual area of ​​these irregular particles and perform rapid statistics.

[0005] 2) When identifying rock thin sections, only the rock within the range of the cover glass needs to be identified. The Petroleum and Natural Gas Industry Standard of the People's Republic of China, "SY / T 5913-2021 Rock Sectioning Methods", 4.1.2 d) specifies the cover glass sizes for commonly used rock thin sections. The smallest cover glass is 18mm x 18mm, or 324mm. 2 Under the microscope, the field of view of the eyepiece with the lowest magnification of 2.5 times is about 5.5mm in diameter, which means that the maximum area of ​​a field of view of the microscope is π×(5.5÷2)2, which is about 23.76mm. 2 Therefore, a single microscope photo cannot cover an entire rock slice. The rock slice on the stage must be moved at least 14 times, with 14 photos taken, to piece together the entire rock slice. This process, coupled with overlapping and missing fields of view, reduces the accuracy of the content calculation and is time-consuming. Summary of the Invention

[0006] To overcome the shortcomings of existing methods in estimating particle content in rock thin sections, such as low accuracy and long time consumption, the present invention provides a device and method for measuring the content of gravel-sized particles in rock thin sections, which can restore the area of ​​gravel-sized particles on a one-to-one basis and accurately and quickly estimate their content ratio in rock thin sections. This provides an accurate basis for the accurate classification of clastic rocks and subsequent oil and gas exploration and development.

[0007] The present invention provides a device for measuring the gravel-grade particle content in rock slices, comprising a hollow transparent box body, wherein a accommodating chamber is provided in the box body, and a partition device is movably provided in the box body, one end of the partition device protruding from the box body, and the partition device divides the accommodating chamber into a measuring chamber and a magnetic powder chamber, wherein the measuring chamber and the magnetic powder chamber are arranged side by side in a vertical direction; One end of the separator extending out of the box body is connected to the box body through a locking device, and the separator is pulled so that the measuring chamber and the magnetic powder chamber are connected or separated from each other; The bottom of the measuring chamber is matched with a transparent plate, and rectangular grid lines are set on the transparent plate; The magnetic powder cabin is filled with magnetic powder; Also included is a pencil-shaped magnet for attracting and moving magnetic powder.

[0008] Preferably, the partition device is a partition, which is vertically arranged in the accommodating chamber, and one end of which is connected to a handle after extending out of the box body.

[0009] Preferably, the locking device includes a buckle plate and a protrusion, the buckle plate and the protrusion are correspondingly arranged, one end of the buckle plate is hinged to the handle, the buckle plate is arranged outside the box body, and a locking groove is provided on the side of the buckle plate facing the box body, and a protrusion is provided on the outer side of the box body, and the locking groove and the protrusion are matched and buckled together.

[0010] Preferably, the gusset plate is hingedly connected to the handle via a pin shaft, and a torsion spring is sleeved on the pin shaft for pressing the gusset plate onto the box body, one end of the torsion spring is connected to the box body, and the other end is connected to the gusset plate.

[0011] Preferably, the two opposite side walls of the box body are respectively provided with card slots, and the two corresponding sides of the partition are movably engaged in the two card slots.

[0012] Preferably, rectangular grid lines of 2 mm×2 mm are provided on the transparent plate.

[0013] Preferably, the cross section of the measurement chamber is triangular or rectangular.

[0014] A method for measuring the content of gravel-sized particles in a rock slice is provided, wherein the method comprises the following steps: Step 1: Place the box body on the rock slice and adjust the position so that the measurement chamber covers the range of the rock slice cover glass. The rock slice consists of three layers from bottom to top: the bottom layer is a rectangular slide, the middle layer is a very thin rock that is approximately square, and the top layer is a square cover glass. The three layers are connected together by gluing. The rock range covered by the cover glass is the effective rock range that needs to be identified; Step 2: Use the rectangular grid lines on the transparent plate to determine the particle size. When a particle occupies one grid or more, it is considered a gravel-sized particle; when a particle does not occupy one grid, it is not included in the measurement. Step 3: Open the partition device and pull the partition device to connect the measurement cabin chamber and the magnetic powder cabin chamber; Step 4: Use a pencil magnet to absorb the magnetic powder in the magnetic powder chamber outside the box, and move it into the measuring chamber, covering the gravel-sized particles. Adjust the position to ensure that all areas of all gravel-sized particles are completely covered. Step 5: Push the partition device so that the partition device completely separates the measurement chamber and the magnetic powder chamber, and connect the partition device to the box body through the locking device; Step 6: Shake the box until the magnetic powder in the measuring chamber is in a regular shape; Step 7, calculate the gravel-grade particle area S 砾 And calculate the rock area S 岩 ; Gravel-grade particle area S 砾 The calculation method is as follows: Measure the side length of the regularly shaped magnetic powder in the measuring chamber and calculate the gravel-grade particle area S 砾 ; Rock area S 岩 The calculation method is as follows: 7.1 Measure the side length of the cover glass and calculate the area of ​​the cover glass, which is the area of ​​the rock slice S. 盖 ; 7.2 When the rock slice fills or exceeds the cover glass, the rock area S 岩 = S 盖 ; 7.3 When the rock section does not completely cover the cover glass: 7.3.1 Open the partition and pull the partition to connect the measurement chamber and the magnetic powder chamber. Tilt the box toward the magnetic powder chamber until all the magnetic powder in the measurement chamber is returned to the magnetic powder chamber. 7.3.2 Lay the box flat and push the partition to leave a gap for moving the magnetic powder, while keeping the measurement chamber and the magnetic powder chamber connected; 7.3.3 Use a pencil magnet to absorb the magnetic powder in the magnetic powder chamber and move it into the measurement chamber, covering all the blank areas under the cover glass. 7.3.4 Push the separator to completely separate the measurement chamber and the magnetic powder chamber, and then use the locking device to lock the separator to the box body; 7.3.5 Shake the box until the magnetic powder in the measuring chamber takes on a regular shape; 7.3.6 Measure the side length of the regularly shaped magnetic powder in the measurement chamber and calculate the blank area S of the rock slice. 空 ; 7.3.7 Calculated rock area S 岩 =S 盖 -S 空 ; Step 8: Based on the gravel particle area S 砾and rock area S 岩 , calculate the gravel-grade rock particle content H in the rock thin section 砾 =(S 砾 / S 岩 )×100%.

[0015] Beneficial effects of the present invention: The present invention uses magnetic powder to depict the entire area of ​​particles of arbitrary shapes in a one-to-one ratio, without being restricted by the shape of the particles. After depicting all gravel-sized particles, the magnetic powder in the measuring chamber is shaken into a regular shape, and the area of ​​all gravel-sized particles is quickly measured and calculated, which is equivalent to quickly converting the "irregular" area into a "regular" area that is easy to calculate. Overall, the method is highly accurate and convenient.

[0016] The device for measuring the gravel-grade particle content in a rock slice of the present invention is directly covered on the rock slice. During the measurement process, there is no need to move the rock slice, and there is no problem of overlapping or missing fields of view, which further improves the accuracy of the content measurement and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a top view of a device for measuring the content of gravel-grade particles in rock slices according to the present invention.

[0018] Figure 2 Set up the mesh for the transparent plate.

[0019] Figure 3 The present invention is a cross-sectional view of a device for measuring gravel-grade particle content in rock slices in its natural state as viewed along the long axis.

[0020] Figure 4 The present invention is a cross-sectional view of a device for measuring gravel-grade particle content in rock slices in its natural state, viewed along the short axis.

[0021] Figure 5 This is a schematic diagram of a device for measuring gravel-grade particle content in rock slices according to the present invention when the gusset plate is opened and the partition is pulled out.

[0022] Figure 6 Schematic diagram of the process of counting the gravel-size particle content in rock slices according to the present invention.

[0023] Figure 7 This is a schematic diagram of the results of the statistical analysis of gravel-size particle content in rock slices in the present invention.

[0024] Reference numerals: 1 - box body; 2 - measuring chamber; 3 - transparent plate; 31 - grid lines; 4 - partition; 5 - magnetic powder chamber; 6 - magnetic powder; 61 - part of the magnetic powder that depicts the particles; 62 - remaining magnetic powder; 7 - locking device; 71 - buckle plate; 72 - protrusion; 73 - pin shaft; 74 - handle; 8 - magnet; A-1 is the magnetic powder area on the first gravel-size particle; A-2 is the magnetic powder area on the second gravel-size particle; Ai is the magnetic powder area on the i-th gravel-size particle; An is the magnetic powder area on the last gravel-size particle; A is the area of ​​magnetic powder with regular shape in the measuring chamber; B is the area of ​​remaining magnetic powder in the magnetic powder chamber. DETAILED DESCRIPTION

[0025] The present invention will be described below with reference to the accompanying drawings.

[0026] See also Figure 1-Figure 5 As shown, a device for measuring the gravel-grade particle content in rock slices comprises a hollow transparent box 1, wherein a accommodating chamber is provided in the box 1. The device is characterized in that a partitioning device is movably provided in the box 1, one end of the partitioning device extending out of the box 1, and the partitioning device divides the accommodating chamber into a measuring chamber 2 and a magnetic powder chamber 5. The measuring chamber 2 and the magnetic powder chamber 5 are arranged side by side in a vertical direction. One end of the separator extending out of the box body 1 is connected to the box body 1 through a locking device 7. Pulling the separator connects the measuring chamber 2 and the magnetic powder chamber 5 to or separates them from each other. The bottom of the measuring chamber 2 is matched with a transparent plate 3, and rectangular grid lines 31 are provided on the transparent plate 3; The magnetic powder 6 chamber is filled with magnetic powder 6; The device further comprises a pencil-shaped magnet 8 for attracting and moving the magnetic powder 6 .

[0027] In one embodiment, the partition device is a partition 4 , which is vertically arranged in the accommodating chamber, and one end of which extends out of the box body 1 and is connected to a handle 74 .

[0028] In one embodiment, the locking device 7 includes a buckle plate 71 and a protrusion 72, and the buckle plate 71 and the protrusion 72 are correspondingly arranged. One end of the buckle plate 71 is hinged to the handle 74. The buckle plate 71 is arranged outside the box body 1, and a locking groove is provided on the side of the buckle plate 71 facing the box body 1. A protrusion 72 is provided on the outer side of the box body 1, and the locking groove and the protrusion 72 are matched and buckled together.

[0029] In one embodiment, the buckle plate 71 is hingedly connected to the handle 74 via a pin 73 , and a torsion spring is sleeved on the pin 73 to press the buckle plate 71 onto the box body 1 . One end of the torsion spring is connected to the box body 1 , and the other end is connected to the buckle plate 71 .

[0030] In one embodiment, corresponding slots are provided on opposite sides of the two side walls of the box body 1 , and the corresponding two sides of the partition 4 are movably engaged in the two slots.

[0031] In one embodiment, a 2 mm×2 mm rectangular grid line 31 is provided on the transparent plate 3 .

[0032] The cross section of the measurement chamber 2 is triangular or rectangular in order to facilitate the calculation of the area.

[0033] A method for measuring the content of gravel-sized particles in a rock slice is provided, wherein the method comprises the following steps: Step 1: Place the box body 1 on the rock slice and adjust the position so that the measurement chamber 2 covers the range of the rock slice cover glass. The rock slice consists of three layers from bottom to top: the bottom layer is a rectangular slide, the middle layer is a very thin rock that is approximately square, and the top layer is a square cover glass. The three layers are connected together by gluing. The rock range covered by the cover glass is the effective rock range that needs to be identified; Step 2: Use the rectangular grid lines 31 on the transparent plate 3 to determine the particle size. When a particle occupies one grid or more, it is considered a gravel-sized particle; when a particle does not occupy one grid, it is not included in the measurement. Step 3, open the partition device and pull the partition device to connect the measurement cabin chamber 2 and the magnetic powder cabin chamber 5; Step 4: Use a pen-shaped magnet 8 to absorb the magnetic powder 6 in the magnetic powder chamber 5 outside the box body 1 and move it into the measuring chamber 2 to cover the gravel-sized particles. Adjust the position to ensure that all areas of all gravel-sized particles are completely covered. The moved magnetic powder 6 is the part of the magnetic powder 61 that depicts the particles; A-1, A-2, Ai, and An are obtained. The area of ​​the remaining magnetic powder 62 in the magnetic powder chamber 6 is B, as shown in FIG. Figure 6 As shown; Step 5: Push the partition device so that the partition device completely separates the measurement chamber 2 and the magnetic powder chamber 5, and connect the partition device to the box body 1 through the locking device 7; Step 6: Shake the box body 1 until the magnetic powder 6 in the measuring chamber 2 is in a regular shape, such as a rectangle. Figure 7 As shown; Step 7, calculate the gravel-grade particle area S 砾 And calculate the rock area S 岩 ; Gravel-grade particle area S 砾 The calculation method is as follows: Measure the side length of the regular-shaped magnetic powder 6 in the measuring chamber 2 and calculate the gravel-grade particle area S 砾; Rock area S 岩 The calculation method is as follows: 7.1 Measure the side length of the cover glass and calculate the area of ​​the cover glass, which is the area of ​​the rock slice S. 盖 ; 7.2 When the rock slice fills or exceeds the cover glass, the rock area S 岩 = S 盖 ; 7.3 When the rock section does not completely cover the cover glass: 7.3.1 Open the separator and pull it to connect the measurement chamber 2 and the magnetic powder chamber 5. Tilt the box body 1 toward the magnetic powder chamber 5 until all the magnetic powder 6 in the measurement chamber 2 returns to the magnetic powder chamber 5. 7.3.2 Lay the box body 1 flat and push the partition device to leave a gap for moving the magnetic powder 6, while keeping the measurement chamber 2 and the magnetic powder chamber 5 connected; 7.3.3 Use the pencil magnet 8 to absorb the magnetic powder 6 in the magnetic powder chamber 5 and move it into the measurement chamber 2, covering all the blank areas under the cover glass. 7.3.4 Push the separator to completely separate the measurement chamber 2 and the magnetic powder chamber 5, and then use the locking device 7 to lock the separator to the box body 1; 7.3.5 Shake the box body 1 until the magnetic powder 6 in the measuring chamber 2 assumes a regular shape; 7.3.6 Measure the side length of the regularly shaped magnetic powder 6 in the measurement chamber 2 and calculate the blank area S of the rock slice. 空 ; 7.3.7 Calculated rock area S 岩 =S 盖 -S 空 ; Step 8: Based on the gravel particle area S 砾 and rock area S 岩 , calculate the gravel-grade rock particle content H in the rock thin section 砾 =(S 砾 / S 岩 )×100%. Example

[0034] Two rock thin sections from Well 96G02 in the conglomerate reservoir of Karamay Oilfield, Xinjiang, were selected. The cover glass dimensions of both thin sections were 24 mm × 24 mm × 0.17 mm. The rocks in the interlayer exceeded the range of the cover glass. The specific depths are shown in Table 1.

[0035] The gravel content measurement device and method for rock thin sections invented in this invention calculates the gravel content in this rock thin section as follows: (1) Place the gravel content measuring section of the rock slice of this invention above the rock slice and adjust the position so that the measuring chamber 2 covers the range of the rock slice cover glass; (2) Use the rectangular grid lines 31 on the transparent plate 3 to determine the particle size. When a particle occupies one grid or more than one grid, it is considered a gravel-grade particle and is marked on the transparent plate 3 above the particle with a red marker. When a particle does not occupy one grid, it is not included in the measurement and is not marked. (3) Open the partition device and pull the partition device to connect the measurement cabin chamber 2 and the magnetic powder cabin chamber 5; (4) Use the pen-shaped magnet 8 to absorb the magnetic powder 6 in the magnetic powder chamber 5 outside the box body 1, and move it into the measuring chamber 2 to cover the gravel-sized particles. Adjust the position to ensure that all areas of all marked gravel-sized particles are completely covered; (5) Push the separating device so that it completely separates the measuring chamber 2 and the magnetic powder chamber 5, and connect the separating device to the box body 1 through the locking device 7; (6) Shake the box body 1 until the magnetic powder 6 in the measuring chamber 2 is rectangular; (7) Using a ruler, measure the side lengths of the rectangular magnetic powder 6 in the chamber to be 26 mm and 16.8 mm respectively. Calculate the gravel-sized particle area S gravel = 26 mm × 16.8 mm = 436.8 mm 2 ; (8) Since the rock in the middle layer has exceeded the range of the cover glass, according to the known size of the cover glass, calculate Srock = Scover = 24 mm × 24 mm = 576 mm 2 ; (9) Calculate the gravel-grade rock particle content in this rock slice: H gravel = (S gravel / S rock) × 100% = (436.8 / 576) × 100% = 75.8%.

[0036] Using this method, the gravel-size particle content of another rock thin section was measured, as shown in Table 1.

[0037] Table 1 Measurement results of the embodiment hashtag Depth (m) Gravel content in rock slices calculated by the method of the present invention (%) 96G02 248.3 75.8 96G02 249.53 82

Claims

1. A device for measuring the content of gravel-grade particles in rock slices, comprising a hollow transparent box with a chamber provided therein, characterized in that: A partition device is movably provided in the box body, one end of which extends out of the box body. The partition device divides the accommodating chamber into a measuring chamber and a magnetic powder chamber. The measuring chamber and the magnetic powder chamber are arranged side by side in a vertical direction. One end of the separator extending out of the box body is connected to the box body through a locking device, and the separator is pulled so that the measuring chamber and the magnetic powder chamber are connected or separated from each other; The bottom of the measuring chamber is matched with a transparent plate, and rectangular grid lines are set on the transparent plate; The magnetic powder cabin is filled with magnetic powder; Also included is a pencil-shaped magnet for attracting and moving magnetic powder.

2. A device for measuring gravel-grade particle content in rock slices according to claim 1, characterized in that: The partition device is a partition, which is vertically arranged in the accommodating chamber, and one end of the partition is connected to a handle after extending out of the box body.

3. The device for measuring gravel-grade particle content in rock slices according to claim 1, characterized in that: The locking device includes a buckle plate and a protrusion, the buckle plate and the protrusion are correspondingly arranged, one end of the buckle plate is hinged to the handle, the buckle plate is arranged outside the box body, and a locking groove is provided on the side of the buckle plate facing the box body, and a protrusion is provided on the outer side of the box body, and the locking groove and the protrusion are matched and buckled together.

4. A device for measuring gravel-grade particle content in rock slices according to claim 3, characterized in that: The buckle plate is hingedly connected to the handle via a pin shaft, and a torsion spring is sleeved on the pin shaft to press the buckle plate onto the box body. One end of the torsion spring is connected to the box body, and the other end is connected to the buckle plate.

5. The device for measuring gravel-grade particle content in rock slices according to claim 2, characterized in that: The two sides of the box body that are opposite to each other are respectively provided with card slots, and the two sides of the partition that are corresponding to each other are movably engaged in the two card slots.

6. The device for measuring gravel-grade particle content in rock slices according to claim 1, characterized in that: The transparent plate is provided with rectangular grid lines of 2 mm×2 mm.

7. The device for measuring gravel-grade particle content in rock slices according to claim 1, characterized in that: The cross section of the measurement chamber is triangular or rectangular.

8. A method for measuring the content of gravel-sized particles in a rock slice, using the device for measuring the content of gravel-sized particles in a rock slice as claimed in claim 1, characterized in that: The method comprises the following steps: Step 1: Place the box body on the rock slice and adjust the position so that the measurement chamber covers the range of the rock slice cover glass. The rock slice consists of three layers from bottom to top: the bottom layer is a rectangular slide, the middle layer is very thin rock, and the top layer is a square cover glass. The three layers are connected together by gluing; Step 2: Use the rectangular grid lines on the transparent plate to determine the particle size. When a particle occupies one grid or more, it is considered a gravel-sized particle; when a particle does not occupy one grid, it is not included in the measurement. Step 3: Open the partition device and pull the partition device to connect the measurement cabin chamber and the magnetic powder cabin chamber; Step 4: Use a pencil magnet to absorb the magnetic powder in the magnetic powder chamber outside the box, and move it into the measuring chamber, covering the gravel-sized particles. Adjust the position to ensure that all areas of all gravel-sized particles are completely covered. Step 5: Push the partition device so that the partition device completely separates the measurement chamber and the magnetic powder chamber, and connect the partition device to the box body through the locking device; Step 6: Shake the box until the magnetic powder in the measuring chamber is in a regular shape; Step 7, calculate the gravel-grade particle area S 砾 And calculate the rock area S 岩 ; Gravel-grade particle area S 砾 The calculation method is as follows: Measure the side length of the regularly shaped magnetic powder in the measuring chamber and calculate the gravel-grade particle area S 砾 ; Rock area S 岩 The calculation method is as follows: 7.1 Measure the side length of the cover glass and calculate the area of ​​the cover glass, which is the area of ​​the rock slice S. 盖 ; 7.2 When the rock slice fills or exceeds the cover glass, the rock area S 岩 = S 盖 ; 7.3 When the rock section does not completely cover the cover glass: 7.3.1 Open the partition and pull the partition to connect the measurement chamber and the magnetic powder chamber. Tilt the box toward the magnetic powder chamber until all the magnetic powder in the measurement chamber is returned to the magnetic powder chamber. 7.3.2 Lay the box flat and push the partition to leave a gap for moving the magnetic powder, while keeping the measurement chamber and the magnetic powder chamber connected; 7.3.3 Use a pencil magnet to absorb the magnetic powder in the magnetic powder chamber and move it into the measurement chamber, covering all the blank areas under the cover glass. 7.3.4 Push the separator to completely separate the measurement chamber and the magnetic powder chamber, and then use the locking device to lock the separator to the box body; 7.3.5 Shake the box until the magnetic powder in the measuring chamber takes on a regular shape; 7.3.6 Measure the side length of the regularly shaped magnetic powder in the measurement chamber and calculate the blank area S of the rock slice. 空 ; 7.3.7 Calculated rock area S 岩 =S 盖 -S 空 ; Step 8: Based on the gravel particle area S 砾 and rock area S 岩 , calculate the gravel-grade rock particle content H in the rock thin section 砾 =(S 砾 / S 岩 )×100%.

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