Geological characteristics and main controlling factors of tar-rich coal in Longdong area
In order to find out the geological characteristics and main controlling factors of tar-rich coal in Longdong area,the geological characteristics of tar-rich coal are examined by referring to the geolog-ical background,coal industry analysis,microscopic coal petrography analysis,the Gray-King low tem-perature dry distillation test and others related tests.Statistical analysis is made to study the linear rela-tionship between coal phase parameters and tar yield,and to explore the main control factors affecting tar-rich coal tar yield in Longdong area.The results show that the fixed carbon content and ash yield appear obviously smaller,and the moisture content and volatile yield obviously larger.The higher the volatile yield is,the higher the tar yield is.The coal rock composition is mainly composed of vitrinite,followed by inertinite,which entirely belongs to tar-rich coal.The tar yield of coal in Longdong area is affected by coal-forming substances and environment of coal formation.The tar yield is positively corre-lated with vitrinite content,which has a negative correlation with inertinite content.It is positively cor-related with the content of Hydrogen and the ratio of H/C atom in coal.The ash component index and the mirror inertness ratio are positively correlated with the tar yield,indicating that the coal-forming en-vironment in Longdong area is wet and anaerobic,which is conducive to the generation of oil from or-ganic matter in coal.The findings lay the foundation for the coal resource exploration and contribute to accurate prediction of tar-rich coal resources in the future.
Longdong areatar-rich coaltar yieldcoal and rock compositioncoal-forming environ-ment
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