Abstract
The comprehensive summary of the distribution and coal quality evaluation of China's Cenozoic coal re-sources is helpful for the efficient and clean utilization of coal resources.The overall distribution of China's Cenozoic coal resources in the Southwest,Northeast,Central South,East China and North China regions were elaborated in this paper.The resource distribution of Cenozoic coal of Yunnan Province and Sichuan Province,and the resource distribution of Cenozoic coal of Liaoning Province,Jilin Province and Heilongjiang Province were focused,the coal quality characteristics and utilization pathways of the main Cenozoic coal measures in China were analyzed too.The research shows that:China's Cenozoic coal is uneven in different regions,the proven geological reserves of coal in different periods of the Cenozoic era are approximately 28 billion tons,the proven geological reserves of Cenozoic coal in the Southwest region are 16.3 billion tons,the Southwest region accounts for maximum proportion of the proven ge-ological reserves of Cenozoic coal in China,other major regions such as Northeast China and East China have varying degrees of distribution.Large scale lignite mining areas which was buried shallowly and has extremely thick coal seam,represented by Xiaolongtan and Zhaotong,have formed during the Neogene period,they are more suitable for open-pit mining.The coal fields such as Fushun,Shenyang,Meihe,and Longkou in Shandong,which had already been formed in Paleogene period,produce more No.41 long flame coal,as well as some lignite and a small amount of gas coal.Neogene and Paleogene lignite account for approximately 2/3 and 1/3 of China's Cenozoic coal.The main coal quality characteristics of China's Paleogene and Neogene coal is generally high total moisture content,sig-nificant changes occurred in ash and sulfur content.From terrestrial sedimentary ultra-low sulfur coal of lacustrine fa-cies to middle and high sulfur coal of marine land interaction facies and shallow marine facies,the coal all exists.The Qnet,ar is generally low.The instability of coal quality in the Cenozoic coal measures in China is related to the dif-ferent geological conditions of coal formation in different regions and eras,there are also significant differences in the indicators of coal macerals,humic acid yield,PM and coal ash melting temperature between Paleogene and Neogene coal.The average vitrinite content of Paleogene coal is higher than that of Neogene coal.The Al2 O3 content in the ash of Paleogene coal is higher than that of Neogene coal,the ash melting temperature of Neogene coal is significantly lower than that of Paleogene coal,which means that Neogene coal is more prone to slagging.When studying the changes in coal quality of the Cenozoic coal series,it is found that the volatile matter(Vdaf)of coal seams in the same coalfield decreases with increasing burial depth,which indicates a deeper degree of coalification.No.41 long flame coal,mainly from the Cenozoic Paleogene,is mostly found in terrestrial sedimentary coalfields,it basically belongs to low sulfur coal,however,many of the Neogene lignite in Yunnan and other provinces are marine terrestrial or shallow marine deposits,they have high sulfur content.The Cenozoic high sulfur coal in China is mainly concentrated in the Neogene lignite of Yunnan Province,high sulfur coal accounts for over 20%of coal production,its high mois-ture content and low calorific value make it difficult to be dehydrated,desulfurized and ash reduced,it is not suit-able for standalone combustion,it is suggested the measures such as sulfur reduction and ash removal should be used to enhance its utilization value.关键词
新生代/煤炭资源/煤质特征/古近纪/新近纪/探明地质储量/长焰煤/褐煤/气煤Key words
Cenozoic era/coal resources/coal quality characteristics/Paleogene/Neogene/the proven geolog-ical reserves of coal/long flame coal/lignite/gas coal分类
地球科学
