济阳坳陷深部煤层吸附效应及含气性特征

发布时间：2018-01-23 01:23

本文关键词： 深部煤层吸附效应转折深度石炭系—二叠系煤层含气性济阳坳陷　出处：《中国石油勘探》2017年05期 　论文类型：期刊论文

【摘要】：深部煤层气是中国目前煤层气勘探开发的一个新的研究领域,以模拟深部条件下的煤层等温吸附实验为研究方法,分析煤层气在温度、压力控制条件下的吸附效应,指出了济阳坳陷石炭系—二叠系煤层含气性临界深度,通过回归分析预测了济阳坳陷深部煤层的吸附量,揭示出深部环境(2000m)温度、压力和煤级共同控制的煤层含气性特征。研究结果表明:济阳坳陷深部煤层的含气性临界深度在800m至1200m之间,该深度以深,温度、压力的协变效应使得吸附量随埋深增加而减小;基于朗格缪尔模型的深部煤层吸附量预测结果显示,埋深4000m条件下高煤级煤仍具有较高吸附量,预测吸附量为12.29cm~3/g,而低煤级煤仅为1.83cm~3/g;在深部高温热效应下煤级随埋深增加而升高,深部煤层吸附气量在温度、压力和煤级"三重效应"控制下于3000~3500m出现转折,该深度以下,吸附量随着埋深增加而增加。
[Abstract]:Deep coalbed methane is a new research field in the exploration and development of coal bed methane in China. The isothermal adsorption experiment of coal seam under simulated deep conditions is used as a research method to analyze the temperature of coal bed methane. Under the condition of pressure control, the critical gas-bearing depth of Carboniferous and Permian coal seams in Jiyang depression is pointed out, and the adsorption capacity of deep coal seam in Jiyang depression is predicted by regression analysis. It is revealed that the temperature of deep environment is 2000m. The research results show that the critical depth of gas-bearing property of deep coal seam in Jiyang depression is between 800m and 1200m, and the depth is deep and temperature. The covariant effect of pressure makes the adsorption amount decrease with the increase of buried depth. The prediction results of adsorption capacity in deep coal bed based on Langmuir model show that the adsorption capacity of high rank coal is still high under the condition of 4000m buried depth, and the predicted adsorption capacity is 12.29 cm ~ (-1) / g. The low rank coal is only 1.83 cm ~ (-1) / g; The coal rank increases with the increase of buried depth under the effect of deep high temperature heat, and the amount of gas adsorbed in deep coal seams turns under the control of temperature, pressure and "triple effect" of coal grade at 3000m or 3500m, which is below this depth. The adsorption capacity increases with the increase of buried depth.
【作者单位】：中国矿业大学煤层气资源与成藏过程教育部重点实验室;中国矿业大学资源与地球科学学院;
【基金】：国家自然科学基金项目“煤层气—煤型气叠合型气藏成藏机理与地质预测方法研究”(41272154)
【分类号】：P618.13
【正文快照】： 中国深部煤层气资源量丰富[1-3],埋深在1500~3000m的煤层气地质资源量约30.37×1012m3[4],占总资源量的55%左右。20世纪80年代以来,美国皮森斯盆地、犹他盆地、大绿河盆地、汉纳盆地以及加拿大的艾伯塔盆地相继成功展开了深部煤层气的商业开发[5],近年来中国相继在鄂尔多斯盆

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