构造煤的测井曲线判识——以柿庄北区块为例

Analysis of Identifying Deformed Coal by Logging Curve in Shizhuang North Block,Qinshui Basin,China

为定量判识构造煤并获取其分布信息,以测井曲线技术为指导研究了构造煤的地球物理特征。总结了煤体结构测井参数变化规律并做出了测井曲线模版,并应用此原理对柿庄北区块煤体结构进行了研究。结果显示:构造煤具有自然伽马负异常、声波时差正异常、低电阻率、井径扩径、人工伽马高幅值等特征;人工伽马与声波时差组合对于煤体结构划分具有较好的判识性。柿庄北区块15号煤构造煤(46%)比3号煤更为发育(13%),为制约15号煤煤层气产量的关键因素;柿庄北区块东北部与西南部构造煤发育,主要受西部NE-NNE向断层及褶皱的控制。

Deformed coal is very important for coal mine gas outburst and coalbed methane（ CBM） development. In order to quantitatively identify and obtain the layout of deformed coal,the geophysical characteristics and coal structure of Shizhuang area（ Qinshui basin,China） were studied with logging applied technology. The characteristics of logging curve and the template which can be used directly in identifying deformed coal have been put forward for the study and it will be a very a practical way in coal mine and CBM development. Findings are as follows：deformed coal has low GR amplitude,high interval transit time,low resistivity,①expanding well diameter and increasing LSD amplitude in logging curve;②3 type coals（ undeformed coal-transitional coal-deformed coal） are arranged from lower-left corner to top right corner in order in AC and LSD diagram; ③The deformed coal proportion of No. 15 coal（ 46%） is significantly higher than No. 3 coal（ 13%） and it maybe the main restricting development factor; ④The northeast and southwest of Shizhuang block have more deformed coal which is controlled by fault zone or fold belt（ NE-NNE）.