Method for manufacturing rock slice of glass chips in fine-grain mixed clastic rock
By using wedge -shaped rock chips in fine -grained mixed fragments, the problem of unable to observe its shape was solved by the method of making the glass dander overlap, and the accurate identification of the boring dandruff in the fine -grained chip rock was realized.
Patent Information
- Application Number
- CN202310918093.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-25
- Publication Date
- 2025-01-28
AI Technical Summary
The prior art is difficult to accurately identify the appearance of tiny glass chips in fine-grained mixed clastic rocks, because the glass chips are superimposed on each other, so it is impossible to observe clearly under a polarizing microscope.
By cutting the rock specimen into a rock of the appropriate size, the bottom surface and the glass slide are bonded, and it is polished to obtain a rock piece with a thickness of 0.03mm to 0.05mm. The tape is covered with glass slices, and the bubbles are discharged to get the rock thin slices.
The stacked stacked state that was originally stacked with each other was exposed, and a single glass debris was exposed. Under the polarized microscope, the shape of the glass chop can be clearly observed, thereby achieving accurate identification of minerals in the rock thin slices.
Smart Images
Figure CN119374978A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of oil and gas exploration, and is a method for making a rock slice of glass fragments in fine-grained mixed clastic rock. Background Art
[0002] In recent years, with the continuous advancement of oil and gas exploration technology, oil and gas resources have been found in fine-grained clastic rocks at home and abroad. Shale oil and fine-grained mixed shale reservoirs have become one of the new exploration targets; rock thin section identification technology is an important basic skill in the oil industry. Nowadays, the oil industry is developing rapidly, and companies are gradually increasing their requirements for rock thin section identification. The market for upgrading thin section identification technology and means is highly competitive. Fine-grained mixed shale is a transitional type of rock between fine-grained volcanic clastic rock and fine-grained sedimentary rock. Identifying whether there are glass fragments in fine-grained mixed clastic rock under a polarizing microscope is an important basis for judging the reservoir sedimentary environment and material source. The shale oil resources in the Mabei area under the jurisdiction of the Fengcheng Oilfield Operation Area of Xinjiang Oilfield are 300 million tons. Due to the unclear understanding of the reservoir and the unclear sedimentary environment, the progress of exploration and production is slow.
[0003] To identify glass shavings in rock slices under existing technology, the rock must first be ground into slices with a thickness of only 0.03 mm. Then use a polarizing microscope to observe the shape of the minerals. The shape of glass shavings is curved and angular or pumice-like. Glass shavings can be identified under a polarizing microscope based on their typical shape. Generally, glass shavings larger than 0.05 mm can be identified. Glass shavings that overlap each other cannot be accurately identified. In order to gain a deeper understanding of the characteristics of the fine-grained mixed shale reservoir of the Fengcheng Formation, a rock slice identification method that can identify finer grains and with higher precision is urgently needed. Summary of the invention
[0004] The present invention provides a method for producing rock slices of glass fragments in fine-grained mixed clastic rocks, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem in the prior art that tiny glass fragments overlap each other, resulting in the inability to observe their appearance and accurately identify them.
[0005] The technical solution of the present invention is achieved by the following measures: A method for making a rock slice of glass fragments in fine-grained mixed clastic rock is carried out according to the following steps: The first step is to cut a piece of rock of the required size from the rock specimen; The second step is to grind the bottom surface of the cut rock block, heat the glass slide, and bond the ground bottom surface of the rock block to the glass slide with solid glue, and remove the bubbles between the rock block and the glass slide; The third step is to continue grinding the top surface of the rock block to obtain a rock slice with a thickness of 0.03 mm to 0.05 mm; Step 4: Continue grinding the rock slice to obtain a rock slice with thin edges and thick center. The fifth step is to apply glue on the top surface of the rock slice obtained in the fourth step, cover it with a cover glass, expel the bubbles between the cover glass and the rock slice after heating, remove excess waste glue to obtain a rock slice, and use a polarizing microscope to identify glass fragments in the rock slice.
[0006] The following are further optimizations and / or improvements to the above technical solutions: In the first step, the size of the rock block is 10 mm to 30 mm in width, 10 mm to 40 mm in length, and 1 mm to 3 mm in thickness.
[0007] In the third step above, the thickness of the rock slice is 0.03 mm.
[0008] In the second step above, when the bottom surface of the rock block is flattened, 180#, 500#, and 1200# diamond sand are used for grinding in sequence.
[0009] In the third step above, when grinding the top surface of the rock block, 180#, 500#, and 1200# diamond abrasives are used in turn.
[0010] In the fourth step, the thickness of the edge of the rock slice is 0.01 mm and the thickness of the center is 0.03 mm.
[0011] In the fourth step above, 1200# diamond sand is used for grinding.
[0012] In the fifth step, the rock slices obtained in the fourth step are coated with liquid glue.
[0013] The present invention removes the overlapping state of glass fragments that were originally overlapped with each other, exposes the overlapped glass fragments individually, and the appearance of individual glass fragments can be observed under a polarizing microscope, thereby accurately identifying minerals in rock slices. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Attached Figure 1 This is a schematic diagram of the rock thin section identification glass fragments of Example 9 of the present invention.
[0015] Attached Figure 1 Middle: 1 is a glass slide, 2 is a cover glass, 3 is liquid gum, 4 is a wedge-shaped rock piece, and 5 is glass shavings.
[0016] Attached Figure 2 This is a polarizing microscope observation image of the rock slice with a thickness of 0.03 mm in Example 10.
[0017] Attached Figure 3 This is a polarizing microscope observation image of a rock slice made by the method of the present invention in Example 10.
[0018] Attached Figure 4 This is a polarizing microscope observation image of the rock slice with a thickness of 0.03 mm in Example 11.
[0019] Attached Figure 5 This is a polarizing microscope observation image of a rock slice made by the method of the present invention in Example 11. DETAILED DESCRIPTION
[0020] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical scheme of the present invention and actual conditions. Unless otherwise specified, the various chemical reagents and chemicals mentioned in the present invention are all known and commonly used chemical reagents and chemicals in the prior art.
[0021] The present invention will be further described below in conjunction with embodiments: Embodiment 1: The method for preparing a rock slice of glass fragments in the fine-grained mixed clastic rock is carried out according to the following steps: The first step is to cut a piece of rock of the required size from the rock specimen; The second step is to grind the bottom surface of the cut rock block, heat the glass slide, and bond the ground bottom surface of the rock block to the glass slide with solid glue, and remove the bubbles between the rock block and the glass slide; The third step is to continue grinding the top surface of the rock block to obtain a rock slice with a thickness of 0.03 mm to 0.05 mm; Step 4: Continue grinding the rock slice to obtain a rock slice with thin edges and thick center. The fifth step is to apply glue on the top surface of the rock slice obtained in the fourth step, cover it with a cover glass, expel the bubbles between the cover glass and the rock slice after heating, remove excess waste glue to obtain a rock slice, and use a polarizing microscope to identify glass fragments in the rock slice.
[0022] The following are further optimizations and / or improvements to the above technical solutions: Embodiment 2: As an optimization of the above embodiment, in the first step, the size of the rock block is 10 mm to 30 mm in width, 10 mm to 40 mm in length, and 1 mm to 3 mm in thickness.
[0023] Embodiment 3: As an optimization of the above embodiment, in the third step, the thickness of the rock slice is 0.03 mm.
[0024] Embodiment 4: As an optimization of the above embodiment, in the second step, when the bottom surface of the rock block is flattened, 180#, 500#, and 1200# corundum are used for grinding. The existing conventional slice making uses 240#, W20, and W7 corundum to grind the surface. In order to make the surface finish of the rock block sufficiently high and adapt to rocks of different hardness, the present invention uses 180#, 500#, and 1200# corundum to grind one side of the bottom surface of the cut rock block.
[0025] Embodiment 5: As an optimization of the above embodiment, in the third step, when grinding the top surface of the rock block, 180#, 500#, and 1200# corundum are used in sequence for grinding.
[0026] Embodiment 6: As an optimization of the above embodiment, in the fourth step, the thickness of the rock slice is 0.01 mm at the edge and 0.03 mm at the center. The wedge-shaped body enables the ground slice to be used for conventional mineral identification and appraisal at the center and for effective identification of fine glass chips at the edge.
[0027] Embodiment 7: As an optimization of the above embodiment, in the fourth step, 1200# diamond abrasive is used for grinding.
[0028] Example 8: As an optimization of the above example, in the fifth step, the rock slice obtained in the fourth step is coated with liquid gum. At present, the conventional process uses solid fir gum, which needs to be heated and liquefied during the operation. Bubbles are easy to generate during the process, and it is difficult to completely drive out the bubbles, which affects the quality of the slices and further affects the identification results. In addition, when driving out the bubbles, the ground rock slices are easy to break, resulting in rework and re-grinding. Liquid gum does not need to be heated, and there are very few bubbles when covering the slices.
[0029] Example 9: A method for preparing a rock slice of glass fragments in the fine-grained mixed clastic rock is carried out according to the following steps: In the first step, a small piece of 20 mm × 30 mm × 2 mm in size is cut from the rock specimen using a slicer equipped with 150# corundum.
[0030] The second step is to grind the bottom surface of the cut rock block, heat the slide over an alcohol lamp and apply solid glue on it, then place the ground bottom surface of the rock block on it and heat it again to squeeze out and flatten the bubbles between the rock block and the slide.
[0031] The third step is to continue grinding the top surface of the rock block with 180#, 500#, and 1200# diamond sand to obtain a rectangular rock piece with a width of 20mm, a length of 30mm, and a thickness of 0.03mm; Step 4: Use 1200# diamond sand to continue grinding the rectangular rock piece to obtain a wedge-shaped rock piece with a thickness of 0.03mm in the center and 0.01mm in the short side. The fifth step is to apply liquid gum on the top surface of the wedge-shaped rock slice, cover it with a coverslip, heat it with an alcohol lamp to squeeze out the bubbles between the coverslip and the rock, scrape off the surrounding waste gum, wash it with alcohol to obtain a rock slice, and use a polarizing microscope to identify the glass fragments in the rock slice.
[0032] Example 10: Application of the rock thin section preparation method of glass fragments in fine-grained mixed clastic rocks in the lithology identification of fine-grained sedimentary layers of the Fengcheng Formation of the Permian System in Fengcheng Oilfield.
[0033] There has been much controversy over the lithology of the fine-grained sedimentary layer of the Permian Fengcheng Formation in Fengcheng Oilfield. Some researchers believe it is tuff, some believe it is sedimentary tuff, and some believe it is tuffaceous fine-grained rock. To solve this problem, the method of the present invention is used to grind and make rock thin sections, and typical tuff materials are identified and quantified in the rock thin sections, which clarifies that the lithology of the Fengcheng Formation in the study area is tuff and sedimentary tuff as interlayers, and the fine-grained sandstone contains oil-bearing tuffaceous. Figure 2 This is a polarizing microscope observation image of a rock slice made by conventional method. The thickness of the rock slice is 0.03mm. It is impossible to confirm whether there are glass fragments in this image. Figure 3 This is a polarizing microscope observation picture of a rock slice made by the method of the present invention, wherein the edge thickness of the short side of the wedge-shaped rock slice is 0.01 mm, and typical tuff glass fragments can be seen in the picture.
[0034] Example 11: Application of the rock thin section preparation method of glass fragments in fine-grained mixed clastic rocks in the lithology identification of mixed rocks in the Lucaogou Formation.
[0035] In the 1950s, exploration in the Jimusar Depression considered the Lucaogou Formation to be thick mudstone and muddy siltstone. After the Ji-25 well obtained industrial oil and gas flow, researchers determined that it was a fine-grained mixed rock. However, due to the fine particle size, whether there is tuff in the mixed material has always been controversial. No typical tuff material can be observed in the rock thin sections ground by conventional technology (see Figure 4 , the slice thickness is 0.03mm). The method of the present invention was used to grind the controversial rocks of the Lucaogou Formation into wedge-shaped rock slices, and typical tuff material - glass fragments were observed in the rock slices (see Figure 5 ), which confirmed the presence of tuff in the mixed rocks of the Lucaogou Formation in Jimsar.
[0036] In summary, the present invention provides a method for producing rock thin sections of glass fragments in fine-grained mixed clastic rocks. The wedge-shaped rock sections produced by the present invention can solve the problem that the appearance of tiny glass fragments cannot be observed due to the overlapping of each other, so that the originally overlapping glass fragments can be released from the overlapping state, and the overlapping glass fragments can be exposed individually. The appearance of individual glass fragments can be observed under a polarizing microscope, thereby accurately identifying the minerals in the rock thin sections.
[0037] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.
Claims
1. A method for preparing a rock slice of glass fragments in fine-grained mixed clastic rock, characterized in that Follow these steps: The first step is to cut a piece of rock of the required size from the rock specimen; The second step is to grind the bottom surface of the cut rock block, heat the glass slide, and bond the ground bottom surface of the rock block to the glass slide with solid glue, and remove the bubbles between the rock block and the glass slide; The third step is to continue grinding the top surface of the rock block to obtain a rock slice with a thickness of 0.03 mm to 0.05 mm; Step 4: Continue grinding the rock slice to obtain a rock slice with thin edges and thick center. The fifth step is to apply glue on the top surface of the rock slice obtained in the fourth step, cover it with a cover glass, expel the bubbles between the cover glass and the rock slice after heating, remove excess waste glue to obtain a rock slice, and use a polarizing microscope to identify glass fragments in the rock slice.
2. The method for preparing a rock slice of glass fragments in fine-grained mixed clastic rock according to claim 1, characterized in that In the first step, the size of the rock block is 10 mm to 30 mm in width, 10 mm to 40 mm in length, and 1 mm to 3 mm in thickness; or / and, in the third step, the thickness of the rock slice is 0.03 mm.
3. The method for preparing a rock slice of glass fragments in fine-grained mixed clastic rock according to claim 1 or 2, characterized in that In the second step, when the bottom surface of the rock block is flattened, 180#, 500#, and 1200# corundum are used for grinding in sequence; or / and, in the third step, when the top surface of the rock block is ground, 180#, 500#, and 1200# corundum are used for grinding in sequence.
4. The method for preparing a rock slice of glass fragments in fine-grained mixed clastic rock according to claim 1 or 2, characterized in that In the fourth step, the thickness of the rock slice is 0.01 mm at the edge and 0.03 mm at the center.
5. The method for preparing a rock slice of glass fragments in fine-grained mixed clastic rock according to claim 3, characterized in that In the fourth step, the thickness of the rock slice is 0.01 mm at the edge and 0.03 mm at the center.
6. The method for preparing a rock slice of glass fragments in fine-grained mixed clastic rock according to claim 1, 2 or 5, characterized in that In the fourth step, 1200# diamond sand is used for grinding.
7. The method for preparing a rock slice of glass fragments in fine-grained mixed clastic rock according to claim 3, characterized in that In the fourth step, 1200# diamond sand is used for grinding.
8. The method for preparing a rock slice of glass fragments in fine-grained mixed clastic rock according to claim 4, characterized in that In the fourth step, 1200# diamond sand is used for grinding.
9. The method for preparing a rock slice of glass fragments in fine-grained mixed clastic rock according to claim 1, 2 or 5, characterized in that In the fifth step, the rock slices obtained in the fourth step are coated with liquid glue.
10. A method for making a rock slice of glass fragments in fine-grained mixed clastic rock according to claim 3, characterized in that In the fifth step, the rock slices obtained in the fourth step are coated with liquid glue.