Occurrences and forms of hydraulic fractures in drilling wells are analyzed for extraction of coalbed methane(CBM). The determination basis of dips, strikes and shapes of the fractures are presented.

对钻井水力压裂开采煤层气时，所形成的裂缝产状和形态进行了理论分析。提出了裂缝倾角、走向和形状的确定依据。

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The result from the diagram analyse would be useful to determination of the possible location of spontaneous combustion and the possible direction of methane flow in the goaf.

图解的结果，对分析采空区内的瓦斯流动方向和可能发生自燃的位置是有益的。

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