贵州省清镇市新店勘查区煤储层含气性及其地质控制
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摘要
本文对新店勘查区煤层气得化学组成、煤层含气量的分布特征和控制煤层含气性的地质因素进行初步分析。本区煤层气成分甲烷浓度不高,平均值为73.76%;等温吸附特征随着绝对瓦斯压力增加,吸附瓦斯量增速较快,绝对瓦斯压力继续增加,则吸附瓦斯量增速减慢;含气量及分布,全区同一煤层甲烷含量在层域上有从上至下逐渐增加的趋势;含煤地层极弱的富水性和透水性,是新店勘查区煤层气在较浅埋深条件下整体得以富集的一个重要原因。
The paper preliminarily analyzes the chemical composition of CBM in Xindian Exploration Area,as well as the distribution characteristics of gas content,and the geological factors controlling the gasbearing properties.The methane concentration of CBM in this area is not high,with the average value of73.76%.The characteristics of isothermal adsorption is indicated to be variable with absolute gas pressure.When the absolute gas pressure increase,the volume of adsorbed gas grows rapidly,and if the gas pressure continues to increase,the adsorbed gas volume will slow down.The gas as content and distribution shows a tendency of increasing gradually from top to bottom in the same coal seam.The coal bearing strata is extremely weak in water abundance and permeability in this area,which makes it an enrichment area as the whole with such a shallow buried condition of CBM.
The paper preliminarily analyzes the chemical composition of CBM in Xindian Exploration Area,as well as the distribution characteristics of gas content,and the geological factors controlling the gasbearing properties.The methane concentration of CBM in this area is not high,with the average value of73.76%.The characteristics of isothermal adsorption is indicated to be variable with absolute gas pressure.When the absolute gas pressure increase,the volume of adsorbed gas grows rapidly,and if the gas pressure continues to increase,the adsorbed gas volume will slow down.The gas as content and distribution shows a tendency of increasing gradually from top to bottom in the same coal seam.The coal bearing strata is extremely weak in water abundance and permeability in this area,which makes it an enrichment area as the whole with such a shallow buried condition of CBM.
引文
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[9]Mover M J.Measurement and evaluation of isothermal absorbing data of coal[M].SPE20728,1990:157-170.
[10]傅雪海,秦勇,韦重韬.煤层气地质学[M].徐州:中国矿业大学出版社,2007.
[2]陈振宏,王一兵,宋岩,等.不同煤阶煤层气吸附、解吸特征差异对比[J].天然气工业,2008,28(3):30-32.
[3]傅雪海.多相介质煤岩体(煤储层)物性的物理模拟与数值模拟[D].中国矿业大学,2001.
[4]傅雪海,秦勇,王万贵,等.煤储层水溶气研究及褐煤含气量预测[J].天然气地球科学,2005,16(2):153-156.
[5]傅雪海,秦勇,杨永国,等.甲烷在煤层水中溶解度的实验研究[J].天然气地球科学,2004,15(4):345-348.
[6]傅雪海,秦勇,王文峰,等.沁水盆地中~南部水文地质控气特征[J].中国煤田地质,2001,13(1):31-34.
[7]傅雪海,王爱国,陈锁忠,等.沁水盆地寿阳—阳泉勘查区控气水文地质条件分析[J].天然气工业,2005,25(1):33-36.
[8]苏现波,林晓英.煤层气地质学[M].北京:煤炭工业出版社,2007.
[9]Mover M J.Measurement and evaluation of isothermal absorbing data of coal[M].SPE20728,1990:157-170.
[10]傅雪海,秦勇,韦重韬.煤层气地质学[M].徐州:中国矿业大学出版社,2007.
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