地震技术在长治经纺矿区煤储层研究中的应用
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摘要
基于长治经纺矿区勘探程度较低,又是沁水盆地煤层气勘探开发的潜在区域。利用三维地震技术方法,掌握该矿区3号主采煤层发育的小于5 m的小型断层及陷落柱等构造的分布规律。在研究区中部和北部识别出走向东西的12条正断层和1条逆断层,在南部识别出多处陷落柱。将地震属性和钻孔测井参数结合,通过相干性比较提取了平均反射强度、最大波峰、均方根振幅和瞬时频率4种地震属性,定量地分析了煤厚、含气量和孔隙度的发育规律,对地质构造和储层物性等的综合分析,探明了煤层气的富集区和最有利开发区域位于研究区中部。
Due to the low explorationextent in Jingfang Mining Area of Changzhi and the potential area of the coal bed methane exploration and development in Qinshui Basin,the 3D seismic technology method was applied to master the distribution laws of the less than 5 m small fault,sink hole and other structures developed in No.3 main mining seam in the mining area.There were 12 normal faults and 1 reverse fault with a strike from east to west were identified in the meddle and north part of the study are and several sink holes were identified in the south part of the study area.In combination with the seismic attribute and the borehole logging parameters,in comparison with the coherency,the mean reflection strength,there were four seismic attributes of the mean reflection intensity,the max wave peak,the mean square root and instantaneous frequency collected.The seam thickness,gas content and porosity development law was quantitatively analyzed.With the comprehensive analysis on the geological structure and reservoir properties,the enriched zone and the favorable development zone of the coal bed methane were verified at the middle part of the study area.
Due to the low explorationextent in Jingfang Mining Area of Changzhi and the potential area of the coal bed methane exploration and development in Qinshui Basin,the 3D seismic technology method was applied to master the distribution laws of the less than 5 m small fault,sink hole and other structures developed in No.3 main mining seam in the mining area.There were 12 normal faults and 1 reverse fault with a strike from east to west were identified in the meddle and north part of the study are and several sink holes were identified in the south part of the study area.In combination with the seismic attribute and the borehole logging parameters,in comparison with the coherency,the mean reflection strength,there were four seismic attributes of the mean reflection intensity,the max wave peak,the mean square root and instantaneous frequency collected.The seam thickness,gas content and porosity development law was quantitatively analyzed.With the comprehensive analysis on the geological structure and reservoir properties,the enriched zone and the favorable development zone of the coal bed methane were verified at the middle part of the study area.
引文
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[2]孟召平,郭彦省,潘结南,等.基于地震属性的煤层厚度预测模型及其应用[J].地球物理学报,2006,49(2):512-517.
[3]Antonio C B Ramos.在煤层甲烷储层中应用三维AVO分析和模拟作裂缝探测[J].朱海龙,译.石油物探译丛,1998(6):59-72.
[4]彭苏萍,高云峰,杨瑞召,等.AVO探测煤层瓦斯富集的理论探讨和初步实践:以淮南煤田为例[J].地球物理学报,2005,48(6):1475-1485.
[5]董守华.煤弹性各向异性系数测试与P波方位各向异性裂缝评价技术[D].徐州:中国矿业大学,2004.
[6]常锁亮,刘大锰,王明寿.煤层气勘探开发中地震勘探技术的作用及应用方法探讨[J].中国煤层气,2008,5(2):23-27.
[7]郭彦省,孟召平,杨瑞昭,等.地震属性及其在煤层厚度预测中的应用[J].中国矿业大学学报,2004,33(5):557-562.
[8]Chen Q,Sidney S.Seismic Attribute Technology for Reservoir Forecasting and Monitoring[J].The Leading Edge,1997,16(5):445-450.
[9]乐友喜.利用模型技术研究地震属性的地质意义[J].物探与化探,2001,25(3):191-197.
[10]马延君,于莉莉,唐学民,等.利用测井方法估算渗透系数[J].中国煤炭地质,2008,20(12):24-25.
[11]Yao Y,Liu D,Tang D,et al.A Comprehensive Model for E-valuating Coalbed Methane Reservoirs in China[J].Acta Geo-logica Sinica,2008,82(6):1253-1270.
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