An analysis of reservoir conditions and responses in longwall panel overburden during mining and its effect on gob gas well performance
An analysis of reservoir conditions and responses in longwall panel overburden during mining and its effect on gob gas well performance
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DOI：
10.1016/j.enggeo.2012.01.002
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发表时间：
2012-02-24
影响因子：
7.4
通讯作者：
Goodman, Gerrit V. R.
中科院分区：
文献类型：
--
作者：
Schatzel, Steven J.;Karacan, C. Ozgen;Goodman, Gerrit V. R.
NIOSH进行了一项合作研究，以提供对长壁面板覆盖层中不断变化的储层条件的直接测量。现场测量记录了渗透率、甲烷浓度、流体压力的变化，以及相邻采空区瓦斯通风孔（GGV）对研究小组中NIOSH钻孔的影响。NIOSH钻孔监测了三种不同的地层。结果表明，采空区瓦斯喷口裂隙网络形成于工作面前方24 ~ 46 m（80 ~ 150 ft）处。在相同的覆盖层试验区的覆盖层渗透率是类似的1 MD前，破坏，增加到数百或数千MD在破坏。渗透性测量后7个月的破坏显示额外的增加。讨论了油藏条件变化、工作面位置变化和地表移动之间的关系。建议通过评估采矿产生的沉降变化来优化GGV性能，从而产生对诱导裂缝渗透率产生重大影响的岩石应力。报告了解释所观察到的储层条件变化的机制。由爱思唯尔公司出版
NIOSH conducted a cooperative research study to provide direct measurements of changing reservoir conditions in longwall panel overburden. The field measurements documented changes in permeabilities, methane concentrations, fluid pressures, and the effects of adjacent gob gas ventholes (GGVs) on NIOSH boreholes drilled in the study panel. Three different stratigraphic horizons were monitored by the NIOSH boreholes. Results indicated that the gob gas venthole fracture network formed 24 to 46 m (80 to 150 ft) ahead of the mining face. Overburden permeabilities within the same overburden test zones were similar to 1 md prior to undermining, increasing to hundreds or thousands of md during undermining. Permeabilities measured seven months after undermining showed additional increases. The relationship between changing reservoir conditions, longwall face position, and surface movement is discussed. Recommendations are made to optimize GGV performance by evaluating changes in subsidence produced by mining, resulting in rock stresses that substantially influence induced fracture permeability. Mechanisms to account for the observed changes in reservoir conditions are reported. Published by Elsevier B.V.