煤与瓦斯突出地球化学成因的岩石热裂解分析

O. Panova, V. Pryvalov, R. Sachsenhofer
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引用次数: 0

摘要

目的。从地球化学角度探讨煤与瓦斯突出的发生条件。方法。本文从煤与瓦斯突出的角度,对煤与瓦斯突出安全区和危险区用岩石热分析法测定沥青和氢指标的结果进行了检验和分析。结果。结果表明,在安全开采煤层上,煤样处于油窗内,煤体微裂缝中可能仍含有吸附的沥青组分(液态烃)膜,这抵消了弹性变形能量的积累和瓦斯聚集的局部化。然而,从液态烃生成区向气窗区过渡导致生烃气体体积急剧增加,这主要是由于液态烃的裂解作用,即出现了煤与瓦斯突出局部化的地球化学触发器。科学的新奇。顿涅茨克盆地煤层的沥青和氢指数的新实验测定值,以及它们与安全和危险开采煤层的结果的比较,表明了这样一个事实,即所有研究的煤样品都来自易突出地区,在几何上位于天然气窗口区域。从已经形成的液态烃裂解开始,随后由于高碳化合物的热降解首先生成干烃气体(主要是甲烷),然后是低碳化合物(湿烃气体)和直接从干酪根基质生成。现实意义。建立了地球化学判据,确定了煤矿开采过程中煤与瓦斯突出气动力现象发生的条件。关键词:煤与瓦斯突出,沥青指数,氢指数,微裂缝,生烃,气窗
本文章由计算机程序翻译,如有差异,请以英文原文为准。
GEOCHEMICAL TRIGGERS OF COAL AND GAS OUTBURSTS DERIVED FROM ROCK-EVAL THERMOLYTIC ANALYSIS
Purpose. Investigation of the conditions for the occurrence of coal and gas outbursts from a geochemical point of view. Methodology. The paper examines and analyses the results of determining bituminous and hydrogen indices using the Rock-Eval thermolytic analysis method on safe and dangerous areas of coal seams in terms of coal and gas outbursts. Results. It was established that on safe mining seams, coal samples are within the oil window, where microcracks in the coal mass may still contain films of sorbed bituminous components (liquid hydrocarbons), which counteract the accumulation of energy of elastic deformations and the localization of gas accumulation. However, the transition from the area of liquid hydrocarbon generation to the gas window leads to a sharp increase in the volume of generated hydrocarbon gases, mainly due to the cracking of liquid hydrocarbons, that is, the emergence of geochemical triggers for the localization of coal and gas outbursts during coal mining. Scientific novelty. The new experimentally determined values of bituminous and hydrogen indices for coal seams of the Donetsk basin, and their comparison with the results within safe and dangerous mining seams, demonstrate the fact that all the studied coal samples from outburst-prone areas geometrically lie in the area of the gas window, starting from the moment of cracking of already formed liquid hydrocarbons and subsequent generation of dry hydrocarbon gases (mainly methane) due to the thermal degradation of higher carbon compounds first, and then low carbon compounds (wet hydrocarbon gases) and direct generation from the kerogen matrix. Practical significance. Established geochemical criteria that determine the conditions for the occurrence of gas-dynamic phenomena - outbursts of coal and gas during coal mining. Key words: coal and gas outbursts, bitumen index, hydrogen index, microcracks, hydrocarbon generation, gas window.
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