The extraction of CBM is impacted by multiple geological factors; main controlling factors are different in different blocks.The Sanjiao block in the Hedong coalfield has simple structures,with respect to other blocks,it has better coal and rock permeability and critical reservoir ratio,good gas-bearing property,thus the preponderant block of CBM extraction,but gas production rate in different wells has great differences.Combined water quality analysis of water from site drainage well with Stiff graphical method,comprehensively analyzed different geological factors,considered that the hydrogeological condition is the main factor of gas control in the block.In addition,the hydrogeological gas control has particularity of positive and negative coupling effects; rational analysis of hydrogeological features is the key to extract CBM successfully.%煤层气的开采受多种地质因素的影响,不同区块的主控因素各不相同.山西河东煤田三交区块构造简单,煤岩渗透率和临储比相对其他区块较优,含气性良好,是煤层气开采的优势区块,但是区内不同气井产气量却相差很大.结合现场排采井采出水的水质分析实验与stiff图解法,综合分析各种地质因素,认为水文条件是该区块控气的主要因素,且水文地质控气存在着正负效应耦合的特殊性,合理分析水文地质特征是成功开采煤层气的关键所在.
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