深煤层中原地吸附/游离气体演变的定量表征:核磁共振流体探测和地质时间模拟的启示

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
Yanbin Yao , Feng Wang , Dameng Liu , Xiaoxiao Sun , Hui Wang
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引用次数: 0

摘要

准确量化吸附瓦斯含量和游离瓦斯含量的共存,对于估算瓦斯就地资源量和预测瓦斯生产动态具有极其重要的意义。在这项研究中,我们对沁水盆地南部郑庄区块三号煤层的应力约束岩心样品进行了实时等温吸附实验和核磁共振流体监测。我们的重点是评估不同压力和温度(P/T)条件下煤炭中的多相甲烷气体含量。通过将实验结果与吸附势理论和 SDR 吸附模型相结合,我们建立了吸附、游离和总瓦斯含量与 P/T 和水/瓦斯体积饱和度函数的综合模型。利用这些模型,我们预测了煤层内吸附瓦斯含量和游离瓦斯含量的垂直变化。我们的研究结果表明,储层压力正效应和储层温度负效应之间的相互作用对吸附和游离甲烷气体都有影响。随着埋藏深度的增加,压力对吸附气体的影响逐渐减弱,而温度的影响则更加明显。相反,游离气体含量则明显受储层压力的影响,温度的影响微乎其微。此外,我们还进行了数值模拟,以重建 3 号煤层的热历史、埋藏轨迹和储层压力演变。模拟结果为了解原位储层中游离和吸附瓦斯含量在不同地质时代的演变提供了基础数据。我们的研究结果揭示了吸附瓦斯含量和游离瓦斯含量的四阶段演化过程,与煤层的隆起和下沉相关联。总之,我们的研究提供了一个概念模型,阐明了不同地质时代多相气体错综复杂的深时演化过程和机制。这项研究的意义对于准确评估瓦斯就地资源、指导深部煤层气资源的勘探和开发至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantitative characterization of the evolution of in-situ adsorption/free gas in deep coal seams: Insights from NMR fluid detection and geological time simulations

Accurate quantification of the coexistence of adsorbed and free gas content holds the utmost significance for estimating gas-in-place resources and predicting gas production dynamics. In this study, we conducted real-time isothermal adsorption experiments and NMR fluid monitoring on stress-confining core samples, from the Zhengzhuang Block's No.3 coal seam in the southern Qinshui Basin. Our focus was on assessing multi-phase methane gas contents within coal under various pressure and temperature (P/T) conditions. By integrating experimental findings with adsorption potential theory and the SDR adsorption model, we developed comprehensive models for adsorbed, free, and total gas contents as functions of P/T and water/gas volume saturation. Utilizing these models, we predicted vertical variations in adsorbed and free gas contents within the coal seam. Our results revealed that the interplay between positive reservoir pressure effects and adverse reservoir temperature effects influenced both adsorbed and free methane gases. With increasing burial depth, the influence of pressure on adsorbed gas diminished, while temperature effects became more pronounced. Conversely, free gas content responded noticeably to reservoir pressure, with temperature exerting a marginal influence. Additionally, we performed a numerical simulation to reconstruct the thermal history, burial trajectory, and evolution of reservoir pressure for the No.3 coal seam. The simulation results served as foundational data for understanding the evolution of free and adsorbed gas contents across different geological epochs within the in-situ reservoir. Our findings unveiled a four-stage evolutionary progression in both adsorbed and free gas contents, correlating with the uplift and subsidence of the coal seam. In conclusion, our study provides a conceptual model elucidating the intricate, deep-time evolution process and mechanisms governing the occurrence of multiphase gases across distinct geological epochs. The implications of this research are crucial for accurately evaluating gas-in-place resources and guiding the exploration and development of deep coalbed methane resources.

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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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