CN114062410A - Sample preparation device and method suitable for determining vitrinite reflectivity by image method - Google Patents
Sample preparation device and method suitable for determining vitrinite reflectivity by image method Download PDFInfo
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- CN114062410A CN114062410A CN202010791052.0A CN202010791052A CN114062410A CN 114062410 A CN114062410 A CN 114062410A CN 202010791052 A CN202010791052 A CN 202010791052A CN 114062410 A CN114062410 A CN 114062410A
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Abstract
The invention discloses a sample preparation device and a method suitable for determining the reflectivity of a vitrinite by an image method, wherein the device comprises the following components: the sample platform is provided with a sample groove at the top, and the sample groove is used for bearing a sample to be detected; the plurality of standard sample grooves are uniformly distributed in the sample groove; and each standard sample tube is inserted into one standard sample groove and is used for accommodating a standard sample. The sample preparation device suitable for determining the reflectivity of the vitrinite by the image method is characterized in that the standard sample tube filled with the standard sample is inserted into the standard sample groove of the sample groove, and the sample to be tested is uniformly laid on the sample groove except the area of the standard sample groove, so that the sample to be tested is uniformly laid around the standard sample, the standard sample and the sample to be tested are uniformly dispersed and prepared, the device is convenient to assemble and disassemble, the standard sample can be recycled, the method is simple, and the testing efficiency is high.
Description
Technical Field
The invention belongs to the field of oil-gas exploration, and particularly relates to a sample preparation device and method suitable for determining vitrinite reflectivity by an image method.
Background
At present, there are two main methods for testing vitrinite reflectivity: photometry and imaging. The conventional photometric method is to measure the percentage of the intensity of the reflected light on the surface of the vitrinite to the intensity of the incident light, and to compare the photoelectric signal value between the vitrinite and a standard sample with known reflectivity in the sample under an optical microscope with fixed intensity of the incident light to determine the reflectivity value of the sample (SY/T5124-. The calibration needs to be frequently carried out by using a standard sample in the test process, the time is long, the efficiency is low, and the operator is easy to fatigue (fly in the white direction, 2011) when observing the eye lens for a long time. The image method is to obtain a relation function between a standard sample reflectivity value and gray scale by measuring the gray scale value of a standard vitrinite by utilizing a gray scale image analysis technology, then perform surface scanning on a fixed area on a sample, preferably perform fitting calculation on the gray scale value data and a standard sample gray scale curve, and further obtain the reflectivity (inverted cloud peak, 2017) of the sample vitrinite. Compared with the traditional photometer method, the tester does not need to look at the eyepiece for a long time for testing, the screen operation can be realized, and the automation degree is improved (wangtau, 2003). However, since the gray value (reflected light intensity) decreases from the center of the image to the periphery (wang, 2017), only one vitrinite at the center of the view field can be taken for gray testing during testing, and the test object outside the center of the view field cannot be taken for points, so that a large number of gray photos need to be obtained for optimization, the testing steps and errors are increased, and the testing efficiency needs to be improved.
Therefore, a sample preparation device and method with simple testing steps and high testing efficiency are particularly needed.
Disclosure of Invention
The invention aims to provide a sample preparation device and a sample preparation method which are simple in testing steps and high in testing efficiency.
In order to achieve the above object, the present invention provides a sample preparation device suitable for measuring reflectance of a vitrinite by an image method, comprising: the sample platform is provided with a sample groove at the top, and the sample groove is used for bearing a sample to be detected; the standard sample grooves are uniformly distributed in the sample grooves; the standard sample tubes are inserted into the standard sample grooves and used for containing standard samples.
Optionally, the sample stage is circular in shape.
Optionally, the sample groove is square in shape.
Optionally, the plurality of standard sample grooves are uniformly distributed in the whole sample groove in an array manner, and the distance between every two adjacent standard sample grooves is the same.
Optionally, the sample to be measured is uniformly laid in the area between every two adjacent standard sample grooves in the sample groove.
Optionally, the standard sample groove is cylindrical and is recessed downwards from the bottom surface of the sample groove; the standard sample tube is a round tube.
Optionally, the standard sample cell has a diameter ranging from 115um to 125 um.
Optionally, the distance between two adjacent standard sample tubes ranges from 495um to 505 um.
Optionally, the standard sample tube has an inner diameter ranging from 100um to 105 um.
The invention also provides a sample preparation method suitable for measuring the reflectivity of a vitrinite by an image method, which utilizes the sample preparation device suitable for measuring the reflectivity of the vitrinite by the image method, and the method comprises the following steps: step 1: loading a standard sample into each standard sample tube, and uniformly paving the sample to be detected in the area between two adjacent standard sample grooves in the sample groove; step 2: collecting images of a standard sample and a sample to be detected under the same central vision field; and step 3: carrying out gray processing on the image to obtain a gray value of a standard sample and a gray value of a sample to be detected; and 4, step 4: calculating the reflectivity of the sample to be detected based on the gray value of the standard sample, the gray value of the sample to be detected and the reflectivity of the standard sample; and 5: and (4) repeatedly executing the step (2) to the step (4), obtaining the reflectivity of a plurality of samples to be detected, and calculating the average value of the reflectivity of the plurality of samples to be detected.
Optionally, the reflectivity of the sample to be detected is calculated by using the following formula:
wherein R is1As the reflectivity of the sample to be measured, G1Is the gray value of the sample to be measured, R0Reflectance of a standard sample, G0Gray scale values for the standard samples.
The invention has the beneficial effects that: the sample preparation device suitable for determining the reflectivity of the vitrinite by the image method is characterized in that the standard sample tube filled with the standard sample is inserted into the standard sample groove of the sample groove, and the sample to be tested is uniformly laid in the sample groove except the area of the standard sample groove, so that the sample to be tested is uniformly laid around the standard sample, the standard sample and the sample to be tested are uniformly dispersed and prepared, the device is convenient to assemble and disassemble, the standard sample can be recycled, the method is simple, and the testing efficiency is high.
The sample preparation method suitable for determining the reflectivity of the vitrinite by the image method is simple and high in measurement precision.
The present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts throughout.
FIG. 1 shows a top view of a sample preparation device suitable for imaging vitrinite reflectance, according to one embodiment of the present invention.
Fig. 2 shows a cross-sectional view of a sample preparation device suitable for image-wise determination of the reflectivity of a vitrinite body, according to one embodiment of the invention.
Fig. 3 is a partially enlarged view showing a positional relationship between a sample to be measured and a standard sample of a sample preparation device for measuring reflectance of a vitrinite by an image method according to an embodiment of the present invention.
Fig. 4 shows a flow chart of a sample preparation method suitable for measuring the reflectivity of a vitrinite body by an image method according to one embodiment of the invention.
Description of reference numerals:
1. a sample stage; 2. a standard sample cell; 3. a standard sample tube; 4. a sample tank; 5. a sample to be tested; 6. and (4) a standard sample.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
According to the invention, the sample preparation device suitable for measuring the reflectivity of the vitrinite by the image method comprises the following components: the sample platform is provided with a sample groove at the top, and the sample groove is used for bearing a sample to be detected; the plurality of standard sample grooves are uniformly distributed in the sample groove; and each standard sample tube is inserted into one standard sample groove and is used for accommodating a standard sample.
Specifically, the sample stage is an optical sheet base, a groove with a square part integrally sunken downwards by 1mm is arranged in the middle of the sample stage and is called as a sample groove, and the sample groove is used for bearing a standard sample and a sample to be tested. And the sample grooves are also uniformly distributed with a plurality of standard sample grooves, each standard sample tube filled with a standard sample is inserted into one standard sample groove, the samples to be detected are uniformly laid around the standard sample grooves, and the uniformity of the mixed standard sample and the samples to be detected is ensured by fixing the positions of the standard samples.
The standard sample tube is a capillary column and is used for containing the crushed standard sample. The inner diameter of the capillary column is 100um, the wall thickness is 10um, the standard sample is crushed to the particle size of 50-100um and then is injected into the capillary column, the capillary column is plugged into the standard sample groove, and the top of the capillary column is flush with the top of the sample table in height.
According to an exemplary embodiment, the sample preparation device suitable for determining the reflectivity of the vitrinite body by the image method is characterized in that a standard sample tube filled with a standard sample is inserted into a standard sample groove of a sample groove, the sample to be tested is uniformly laid on the sample groove except for the area of the standard sample groove, so that the sample to be tested is uniformly laid around the standard sample, the sample preparation of the standard sample and the sample to be tested in a uniformly dispersed mode is realized, the device is convenient to assemble and disassemble, the standard sample can be recycled, the method is simple, and the testing efficiency is high.
Alternatively, the sample stage is circular in shape.
Alternatively, the sample well is square in shape.
Alternatively, a plurality of standard sample grooves are uniformly distributed in an array manner in the whole sample groove, and the distance between every two adjacent standard sample grooves is the same.
Specifically, the plurality of standard sample tubes are arranged in the whole sample groove in an array form of a plurality of rows and columns, namely, the plurality of standard sample tubes are uniformly arranged in the whole sample groove along the transverse direction and the longitudinal direction, the shape of each sample tube is the same as that of the sample groove, the sample tubes are also square, and the distance between every two adjacent standard sample grooves is the same.
Alternatively, the sample to be measured is uniformly spread in the area between every two adjacent standard sample grooves in the sample groove.
Specifically, the sample to be tested is uniformly laid on the area except for the plurality of standard sample grooves in the sample groove, that is, the sample to be tested is laid on the sample groove area between two adjacent standard sample grooves, and the sample to be tested is laid around each standard sample groove.
Alternatively, the standard sample cell is cylindrical and is recessed downward from the bottom surface of the sample cell; the standard sample tube is a round tube.
Specifically, the standard sample groove is a cylinder which is recessed downwards from the bottom surface of the sample groove, so that a standard sample tube can be conveniently inserted and placed.
Alternatively, the standard sample cell has a diameter ranging from 115um to 125 um.
In one example, the standard sample cell has a pore size in the range of 120 um.
Alternatively, the spacing between two adjacent standard sample tubes ranges from 495um to 505 um.
Specifically, the distance between two adjacent standard sample tubes is preferably 500um, so that one group of standard samples and samples to be tested or multiple groups of adjacent standard samples and samples to be tested can be acquired under the same central vision field.
Alternatively, the standard sample tube has an inner diameter in the range of 100um to 105 um.
Specifically, the inner diameter of the standard sample tube is ensured to be capable of being inserted into the standard sample groove and also ensuring that standard sample particles can be placed into the standard sample groove.
The invention also provides a sample preparation method suitable for measuring the reflectivity of the vitrinite by the image method, which utilizes the sample preparation device suitable for measuring the reflectivity of the vitrinite by the image method and comprises the following steps: step 1: loading a standard sample into each standard sample tube, and uniformly paving the sample to be detected in the area between two adjacent standard sample grooves in the sample groove; step 2: collecting images of a standard sample and a sample to be detected under the same central vision field; and step 3: carrying out gray processing on the image to obtain a gray value of a standard sample and a gray value of a sample to be detected; and 4, step 4: calculating the reflectivity of the sample to be detected based on the gray value of the standard sample, the gray value of the sample to be detected and the reflectivity of the standard sample; and 5: and (5) repeatedly executing the step (2) to the step (4) to obtain the reflectivity of the plurality of samples to be detected, and calculating the average value of the reflectivity of the plurality of samples to be detected.
Specifically, compared with the conventional sample preparation method, the standard sample is mixed in the sample to be detected, so that the gray values of the sample to be detected and the standard sample can be simultaneously obtained when the vitrinite reflectivity is measured by using an image method. And when the gray scale is measured, one or more groups of samples to be measured and standard samples of the same central vision field are selected for photographing, the reflectivity value of the samples to be measured is calculated according to the linear relation between the reflectivity value of the standard samples and the gray scale, the steps are repeated to obtain images of different samples to be measured and standard samples, the average value of the reflectivity of the samples to be measured is calculated, and the average value is used as the final reflectivity of the samples to be measured.
According to an exemplary embodiment, the sample preparation method suitable for measuring the reflectivity of the vitrinite by the image method of the invention uses the sample preparation device to collect the standard sample and the sample to be measured under the same central vision field, and simultaneously obtains the gray value of the standard sample and the sample to be measured, and the reflectivity value of the sample with the test is calculated according to the linear relation between the reflectivity value of the standard sample and the gray value.
Alternatively, the reflectance of the sample to be measured is calculated using the following formula:
wherein R is1As the reflectivity of the sample to be measured, G1Is the gray value of the sample to be measured, R0Reflectance of a standard sample, G0Gray scale values for the standard samples.
Specifically, the reflectance value of the test sample is calculated through the linear relation between the reflectance value of the standard sample and the gray scale.
Examples
FIG. 1 shows a top view of a sample preparation device suitable for imaging vitrinite reflectance, according to one embodiment of the present invention. Fig. 2 shows a cross-sectional view of a sample preparation device suitable for image-wise determination of the reflectivity of a vitrinite body, according to one embodiment of the invention.
Referring to fig. 1 and 2, the sample preparation device for measuring the reflectivity of a vitrinite by an image method includes: the device comprises a sample table 1, wherein a sample groove 4 is formed in the top of the sample table 1, and the sample groove 4 is used for bearing a sample 5 to be detected; the plurality of standard sample grooves 2 are uniformly distributed in the sample groove 4; a plurality of standard sample tubes 3, each standard sample tube 3 being inserted into one standard sample well 2, the standard sample tubes 3 being for accommodating standard samples 6.
Wherein, the shape of the sample platform 2 is round.
Wherein the sample well 4 is square in shape.
Wherein, a plurality of standard sample grooves 2 are uniformly distributed in the whole sample groove 4 in an array mode, and the distance between every two adjacent standard sample grooves 2 is the same.
Wherein, the sample 5 to be measured is uniformly laid in the area between every two adjacent standard sample grooves 2 in the sample groove 4.
Wherein, the standard sample groove 2 is cylindrical and is downwards sunken from the bottom surface of the sample groove 4; the standard sample tube 3 is a round tube.
Wherein, the diameter range of the standard sample groove 2 is 115um to 125 um.
Wherein, the interval range between two adjacent standard sample tubes 3 is 495um to 505 um.
Wherein, the inner diameter range of the standard sample tube 3 is 100um to 105 um.
Taking a kerogen sample as an example, taking 1 kerogen sample (coal sample), loading the kerogen sample into a sample tank according to the requirement on the particle diameter of a rock sample in the whole rock slide micro-component identification and statistical method of the industry standard, bonding the kerogen sample by using a curing agent, and coating a layer of release agent on the sample tank in advance so as to facilitate the removal of the sample after testing. Selecting a standard sample commonly used in the reflectivity test, grinding the standard sample, preparing the ground standard sample into particles with the particle size of about 100um by using a ball mill, filling the particles into a standard sample tube, firmly bonding the particles by using a curing agent, and then plugging the standard sample tube into a standard sample groove. The whole sample grooves are distributed on the resin optical sheet in a square shape, the side length is 20mm multiplied by 20mm, one standard sample groove is distributed at intervals of 500um, and a sample to be detected can be filled between the two standard sample grooves. The distribution can ensure that at least one standard sample particle and a sample particle to be detected can appear in each vision field under the maximum vision field of the lens, and fully ensures the uniformity of sample mixing so as to realize the gray scale of simultaneously measuring the standard sample and the sample to be detected under the same vision field.
Example two
Fig. 3 is a partially enlarged view showing a positional relationship between a sample to be measured and a standard sample of a sample preparation device for measuring reflectance of a vitrinite by an image method according to an embodiment of the present invention. Fig. 4 shows a flow chart of a sample preparation method suitable for measuring the reflectivity of a vitrinite body by an image method according to one embodiment of the invention.
With reference to fig. 3 and 4, the sample preparation method for measuring the reflectivity of a microscopic body by an image method, which uses the sample preparation device for measuring the reflectivity of a microscopic body by an image method, includes:
step 1: loading a standard sample into each standard sample tube, and uniformly paving the sample to be detected in the area between two adjacent standard sample grooves in the sample groove;
step 2: collecting images of a standard sample and a sample to be detected under the same central vision field;
and step 3: carrying out gray processing on the image to obtain a gray value of a standard sample and a gray value of a sample to be detected;
and 4, step 4: calculating the reflectivity of the sample to be detected based on the gray value of the standard sample, the gray value of the sample to be detected and the reflectivity of the standard sample;
and 5: and (5) repeatedly executing the step (2) to the step (4) to obtain the reflectivity of the plurality of samples to be detected, and calculating the average value of the reflectivity of the plurality of samples to be detected.
Wherein, the reflectivity of the sample to be measured is calculated by adopting the following formula:
wherein R is1As the reflectivity of the sample to be measured, G1Is the gray value of the sample to be measured, R0Reflectance of a standard sample, G0Gray scale values for the standard samples.
Two adjacent groups of the same central field of view are selected for photographing when testing the gray scale, taking the two adjacent groups of particles in fig. 3 as an example. The gray scale of the standard sample is measured to be G0Gray scale of the sample to be measured is G1Since the reflectance of the standard sample is known as R0The Gray level Gray and the reflectance Ro of the standard sample are in a linear relationship, and the Gray level G passes through the Gray level Gray and the reflectance Ro0、G1And reflectance R of the standard sample0Three parameters can be used for calculating the reflectivity R of the sample to be measured2The same method can be used for calculating the reflectivity values of a plurality of samples to be measured, and the average value of the reflectivity values of the plurality of samples to be measured is calculated to obtain the final reflectivity value of the sample to be measured.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A sample preparation device suitable for measuring the reflectivity of a vitrinite body by an image method is characterized by comprising the following components:
the sample platform is provided with a sample groove at the top, and the sample groove is used for bearing a sample to be detected;
the standard sample grooves are uniformly distributed in the sample grooves;
the standard sample tubes are inserted into the standard sample grooves and used for containing standard samples.
2. The apparatus as claimed in claim 1, wherein the sample stage is circular and the sample groove is square.
3. The apparatus according to claim 1, wherein the plurality of standard sample wells are uniformly arranged in an array throughout the sample wells, and the distance between every two adjacent standard sample wells is the same.
4. The apparatus according to claim 3, wherein the sample to be measured is uniformly laid in the sample well in the area between every two adjacent standard sample wells.
5. The apparatus according to claim 1, wherein the standard sample well is cylindrical and is recessed downward from the bottom surface of the sample well; the standard sample tube is a round tube.
6. The apparatus according to claim 5, wherein the standard sample groove has a diameter ranging from 115um to 125 um.
7. The apparatus according to claim 6, wherein the spacing between two adjacent standard sample tubes is in the range of 495um to 505 um.
8. The apparatus of claim 6, wherein the standard sample tube has an inner diameter ranging from 100um to 105 um.
9. A sample preparation method for measuring the reflectivity of a vitrinite by an image method, which is implemented by using the sample preparation device for measuring the reflectivity of a vitrinite by an image method according to any one of claims 1 to 8, and comprises the following steps:
step 1: loading a standard sample into each standard sample tube, and uniformly paving the sample to be detected in the area between two adjacent standard sample grooves in the sample groove;
step 2: collecting images of a standard sample and a sample to be detected under the same central vision field;
and step 3: carrying out gray processing on the image to obtain a gray value of a standard sample and a gray value of a sample to be detected;
and 4, step 4: calculating the reflectivity of the sample to be detected based on the gray value of the standard sample, the gray value of the sample to be detected and the reflectivity of the standard sample;
and 5: and (4) repeatedly executing the step (2) to the step (4), obtaining the reflectivity of a plurality of samples to be detected, and calculating the average value of the reflectivity of the plurality of samples to be detected.
10. The sample preparation method for determining the reflectivity of the vitrinite according to the image method of claim 9, wherein the reflectivity of the sample to be measured is calculated by using the following formula:
wherein R is1As the reflectivity of the sample to be measured, G1Is the gray value of the sample to be measured, R0Reflectance of a standard sample, G0Gray scale values for the standard samples.
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| CN202010791052.0A CN114062410A (en) | 2020-08-07 | 2020-08-07 | Sample preparation device and method suitable for determining vitrinite reflectivity by image method |
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