A new determination method for coal metamorphism degree
/ 0
- Details
- Category: Geology
- Last Updated on 29 June 2019
- Published on 13 June 2019
- Hits: 2317
Authors:
K.A.Bezruchko, Dr. Sc. (Geol.), Senior Research Fellow,orcid.org/0000-0002-3818-5624,Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
L.I.Pymonenko, Dr. Sc. (Geol.), Senior Research Fellow,orcid.org/0000-0002-5598-6722,Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
O.K.Balalaiev, Cand. Sc. (Biol.), Senior Research Fellow,orcid.org/0000-0002-9389-4562,Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
V.I.Baranovskyi, orcid.org/0000-0002-0409-5292, Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract:
Purpose. Development and approbation of a new method for determining the degree of coal metamorphism by the index of gray shade intensity of macerals for microphotographs of lump sections of coal samples.
Methodology. Optical spectroscopy using a video-optical complex: MBI – 11, HB 200, followed by digital computer processing (Scope photo software) of microphotographs of coal substance samples upon lump sections.
Findings. A new method is proposed for determining the degree of coal substance metamorphism, the essence of which is the use of optical microscopy of lump sections of coal samples, followed by digital processing of the obtained data. The method was tested on coal samples of various ranks – from long-flame to anthracite. To characterize the degree of coal metamorphism, a new index of the gray shade intensity of macerals was applied on the photographic images of the lump sections of coal samples microscopically. Correlation of the proposed index with the classical ones of the degree of coal metamorphism – vitrinite reflectance is shown.
Originality. For the first time, a digital processing of photographic images of the lump sections of coal samples using a new index of gray shade intensity of macerals was applied to characterize the degree of coal metamorphism.
Practical value. The proposed method can be used for practical application in order to assess the degree of coal metamorphism. This method differs by its operability and simplicity from the currently widely used one for determining the degree of coal metamorphism by vitrinite reflectance. The method can also be applied to assess the recoverability of coals and calculation of their maceral composition.
References.
1. ASTM D388-18a. Standard Classification of Coals by Rank. ASTM International. West Conshohocken. PA. (2018). Retrieved from www.astm.org.
2. ISO 11760:2018(en) Classification of coals(n.d.). Retrieved from https://www.iso.org/obp/ui/#iso:std:iso: 11760:ed-2:v1:en.
3. SS 3472:2015 Bevey coal, stone and anthracite. Classification 01.08.2016. (2016). Retrieved from http://document.ua/vugillja-bure-kamE28099jane-ta-antracit_-klasifikacija-nor29387.html.
4. Hackley, P. (2014). Standardization of vitrinite reflectance measurements in shale petroleum systems: how accurate are my Ro data? Online Journal for E&P Geoscientists. AAPG Annual Convention and Exhibition. Houston. TX. Retrieved from http://www.searchanddiscovery.com/abstracts/html/2014/90189ace/abstracts/1841915.htm.
5. American Society for Testing and Materials (ASTM). (2011). Standard test method for microscopical determination of the reflectance of vitrinite dispersed in sedimentary rocks: West Conshohocken. PA. ASTM International. Annual book of ASTM standards: Petroleum products. lubricants. and fossil fuels; Gaseous fuels; coal and coke, 5(5.06. D7708-11), 823-830. DOI: 10.1520/D7708-11.
6. Jennifer M.K. O’Keefe, Achim Bechtel, Kimon Christanis, & Shifeng Dai. (2013). On the fundamental difference between coal rank and coal type. International Journal of Coal Geology, 118, 58–87.
7. ScopePhotoImageSoftware(n.d.). Retrieved from http://labx.narod.ru/documents/scope_photo_image_software.html.
8. Bezruchko, K.A., & Baranovskiy, V.I. (2014). Marks of gas-generation processes in Donbas coal. Coal of Ukraine, 11, 31-33.
9. Bezruchko, K., & Matrofailo, M. (2014). Formation dynamics of coal seams morphostructure of the deep-seated horizons of the L'viv-Volyn' basin. Progressive Technologies of Coal. Coalbad Methane. Ores Mining. London: Taylor & Francis Group. 201-207.
10. Jmicrovisionsoftware(n.d.). Retrieved from https://www.jmicrovision.com/. html.
11. ImageJsoftware(n.d.). Retrieved from //rsb.info.nih.gov/ij/. html.
12. NAFE software(n.d.). Retrieved from http://www.zam.fme.vutbr.cz/~druck/Nafe/Index.htm.
Archive