The main purpose is to identify the macerals of shale, carbonate rock and coal slick
The polished rock slice made of representative rock samples is placed under the reflective microscope, and white light and fluorescence are used alternately. The microscopic components are identified according to the color, intensity, structural morphology, protuberance, internal reflection, occurrence of reflected light and the color, morphology and intensity of fluorescence. The percentages of macerals and minerals were calculated by point counting method or visual estimation method. The main macerals are as follows:Sapropelic formation (structural algae, stratiform algae, asphaltite), vitrinite (hydrogen rich vitrinite, normal vitrinite, recirculating vitrinite), inertinite (mycelium, coarse grain, fungi, inertinite), secondary organic matter (hydrocarbon, asphaltic, microsomal, anisotropic), animal organic clastic group (animal clastic, animal mollusc), mineral asphalt matrix.
Binocular polarizing light, reflector light microscope, and equipped with reflector fluorescence device. Calculator, immersion
Rock samples or crushed, no fluorescent binder + rock crushed to make photographic samples
4.1 First open the high pressure pump lamp, then open the white aperture, and check whether the switching device between white and fluorescent lamp is normal.
4.2 Place the flattened light plate on the platform, drop oil immersion, focus the microscope, and correct the center of the objective lens; Adjust aperture aperture and view aperture to make view brightness centered, light uniform and image clear.
4.3 Determine the step distance and row space of the moving ruler of the carrying platform, and it is appropriate to use 0.4-0.6mm. More than 800 effective measuring points should be ensured to be evenly spread throughout the film. Step space and row space are determined according to the following formula:
S = 1/2dmax…… 、、、、、、、、、、、、、、、、、、、、、、、、(1)
In the formula: S — step space, line space, mm;
Dmax — the diameter of the largest particle in the light sheet, mm.
4.4 Fix the platform, starting from one end of the sample, identify the microscope component or mineral belonging to the effective substance under the cross wire intersection of the eyepiece, and count it into the corresponding counting key, then move along the fixed direction gradually according to the predetermined step length, if the cross wire intersection falls on the cement (such as epoxy resin, etc.). The cell cavity, cavity, fissure and unidentifiable small particles in the microscope components shall be regarded as invalid points and shall not be counted. When the intersection point of the cross wire falls on the boundary of different components, starting from the upper right quadrant, the substance in the quadrant where the boundless boundary exists is selected in clockwise order as the identification object.
4.5 After each line is counted, make the optical plate move one step in a fixed direction (perpendicular to the previous step direction) with the reserved line space, and continue the statistics of another line until the statistics of the entire optical plate is finished.
4.6 During observation and identification, white light and fluorescence should be used alternately to accurately identify macerals.
5.1 The total effective point of each sample statistic：There are not less than 50 consecutive viewport components or more than 800 valid measuring points. among which the total number of maceral points should not be less than 16, otherwise the measurement results are only for reference.
5.2 The volume fractions of the various macerals and minerals are expressed as a percentage of their statistical points to the effective points and are approximated to one decimal place.
SY/T6414—1999 Maceral analysis on polished surface of whole rocks