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。