用改进方法评估深煤层瓦斯含量及其地质控制因素

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Haiqi Li, Shida Chen, Dazhen Tang, Shuling Tang, Jiaosheng Yang
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引用次数: 0

摘要

根据现场自然解吸曲线,建立了深埋煤反演过程中估算瓦斯含量的改进评价方法。然后比较了美国矿业局(USBM)、多项式拟合、阿莫科和改进的评估方法在预测沁水盆地马壁洞区块深部煤层瓦斯损失量方面的准确性。此外,还比较了这些不同方法根据取芯时间模拟失气量的计算误差。建立了一个新的非线性方程来估算最小误差值,通过将损失时间控制在 16 分钟内,可以减少相关误差。结果表明,改进后的评估能准确、快速地预测深煤层的瓦斯含量。结果表明,深部煤层瓦斯积聚受多种因素影响,包括地质构造、水动力条件、顶板岩性和煤化作用。逆断层和弱地下水径流会阻碍煤层气的逸出,在未来的煤层气勘探和开发中应考虑这些因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Gas content evaluation in deep coal seam with an improved method and its geological controls

An improved evaluation method for estimating gas content during the inversion process of deep-burial coal was established based on the on-site natural desorption curves. The accuracy of the US Bureau of Mines (USBM), Polynomial fitting, Amoco, and the improved evaluation methods in the predicting of lost gas volume in deep seams in the Mabidong Block of the Qinshui Basin were then compared. Furthermore, the calculation errors of these different methods in simulating lost gas content based on coring time were compared. A newly established nonlinear equation was developed to estimate the minimum error value, by controlling the lost time within 16 min, the related errors can be reduced. The improved evaluation was shown to accurately and rapidly predict the gas content in deep seams. The results show that the deep coal bed methane accumulation is influenced by various factors, including geological structure, hydrodynamic conditions, roof lithology, and coalification. Reverse faults and weak groundwater runoff can hinder the escape of methane, and these factors should be considered in the future exploration and development of coalbed methane.

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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
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