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新疆库拜煤田A5煤层含气量建模方法

2017-10-21王月江杨明明张娜

价值工程 2017年32期

王月江+杨明明+张娜

摘要: 煤层气是一种优质、高效、环保的洁净能源,煤层含气量是评价煤层气区块优劣的重要指标,也是煤层气资源储量计算的重要参数。本文采用地质多元统计分析,对新疆庫拜煤田A5煤层的埋深、灰分、水分、镜质组反射率等含气量因素进行筛选,并对主要因素进行多元回归,建立煤层含气量模型,通过验证,误差平均为-1.52%,效果较好,有利于在库拜煤田进行含气量预测,对煤层气选区具有指导意义。

Abstract: Coalbed methane is a kind of high quality, high efficiency and environmentally friendly clean energy. Methane content is an important index to evaluate the quality of coalbed methane block, and it is also an important parameter of coalbed methane reserve. In this paper, the geology and multivariate statistical analysis was used to screen the gas content of the buried seam, ash, moisture and vitrinite reflectance of the A3 coalbed in Xinjiang, and the main factors were analyzed by multiple factors. The coalbed gas content model is established. Through verification, the average error is -1.52% and the effect is good, which is conducive to the gas prediction in Kubai coalfield. It is of guiding significance for coalbed methane region selection.

关键词: 库拜煤田;A5煤层;含气量预测;多元统计

Key words: Kubai coalfield;A5 coalbed;methane content prediction;multivariate statistics

中图分类号:P641.4+61 文献标识码:A 文章编号:1006-4311(2017)32-0157-03

0 引言

煤层含气量是指吨煤中含甲烷、二氧化碳、氮气及少量一氧化碳和稀有气体所占的体积[1]。其主要成分以甲烷含量最高,是煤储层储集性能的基本指标,是煤层气选区评价的重要指标,也是煤层气资源/储量计算的重要参数。

目前获取含气量的方法主要为实测法、推测法和类比法。实测法:通常采用参数井进行钻孔取芯进行含气量测试确定其实测数值,但参数井数量有限,无法对全区进行含气量的全面分析。推测法:还可根据已获得的浅部计算单元内含气量与深度关系为前提,推算地质条件相似的深部计算单元内的含气量值;类比法:在缺乏煤层含气量实测值的计算单元,可以类比相邻或地质条件相似、具有相同埋深范围的区块的含气量值。其共同的缺点就是只能表达空间上一个变量和含气量之间的关系,不够贴切实际,无法满足空间上储层各个因素的精细描述[3]。……

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