摘要
根据风氧化煤中有机质、灰分、挥发分以及固定碳含量等成分的变化,结合氢、氧含量、发热量、视密度、黏结性、测井参数等,讨论风氧化煤地质与地球物理特征:(1)风氧化煤表面C、O原子含量变少,风氧化煤内部的风氧化程度要弱于表面;(2)风氧化煤光泽暗淡,因风氧化作用产生的煤成黏土密度低于黏土;(3)干燥无灰基碳、氧+硫含量在风化煤最低,氢含量反之最高;(4)风氧化煤的有机质绝大多数被破坏,灰分剧增,挥发分及固定碳降低;(5)氧化煤有高自燃性,与之相反风化煤不具有易燃性,反可作为防火预留煤柱。(6)随风化程度的加深,在测井曲线上自然伽马、伽马伽马呈现高幅值,电阻率呈现低幅值;(7)岩浆侵入导致氧化煤其电阻率曲线基本为零,密度变小。
According to content and component variations of organic matter, ash, volatile matter and fixed carbon in the weathered, oxidized coals, combined with hydrogen, oxygen contents, calorific value, apparent density, caking property and well logging parameters etc. have discussed weathered, oxidized coals geological and geophysical features. The results have： ①the coals have less C and O atoms, the internal oxidation degree is weaker than on the surface; ②dull luster, because of weathering oxidation produced coal clay density is lower than the clay; ③dry and ash free basis carbon, oxygen and sulfur contents are the lowest, while hydrogen highest on the contrary;④most of organic matter have been destroyed, ash content increasing dramatically, volatile matter and fixed carbon lowering down; ⑤the oxidized coal has high spontaneous combustibility, while the weathered coal without inflammability, instead, can be used as fire barrier-pillar; ⑥along with weathering degree deepening, gamma-ray and gamma-gamma on well logging traces present high amplitude, resistivity low amplitude; ⑦magmatic intrusion caused oxidized coal resistivity is basically zero, density minified.
作者
孙伟涛
胡莹
Sun Weitao;Hu Ying(The First Exploration Bureau,CNACG,Handan,Hebei 056107)
出处
《中国煤炭地质》
2018年第A02期70-73,共4页
Coal Geology of China
关键词
风氧化煤
地质特征
地球物理特征
煤成黏土
测井曲线
weathered
oxidized coals
geological features
geophysical features
coal clay
logging trace
