地震勘探技术在煤层气富集区预测中的探索性研究
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摘要
实际测试表明:煤层气富集区区域在物性特征及地震响应上与煤层气含量较低区域有显著不同,煤层气富集区的地震波速度约为正常煤层的4/5。地震正演模拟结果显示:煤层气富集区地段在地震资料上出现地震波至时间加长、振幅减弱、频率降低的特征。本文以此理论为基础,利用波阻抗反演、频谱分解技术,对某矿区煤层气富集区进行了尝试性预测,实际抽采资料表明:这些方法预测的煤层气富集区与实际抽采的结果基本吻合。这些方法的应用为后续的煤层气开发奠定了基础。
It is proved that there are significantly differences in physical characteristics and seismic response between CBM-riched regions and low CBM regions,and the velocity of seismic wave in the former is about 4/5 of that in the latter.The seismic forward modeling showed that the seismic wave arrival time was delayed,the seismic amplitude was weakened and the seismic frequency was reduced in CBM-riched regions.Based on these characteristics,the CBM-riched region in some coal mine was forecast by using wave impedance inversion and spectral decomposition.The prediction of CBM-riched region was consistency with the results from the actual extraction.The applications of these methods could provide a foundation for the development of CBM.
It is proved that there are significantly differences in physical characteristics and seismic response between CBM-riched regions and low CBM regions,and the velocity of seismic wave in the former is about 4/5 of that in the latter.The seismic forward modeling showed that the seismic wave arrival time was delayed,the seismic amplitude was weakened and the seismic frequency was reduced in CBM-riched regions.Based on these characteristics,the CBM-riched region in some coal mine was forecast by using wave impedance inversion and spectral decomposition.The prediction of CBM-riched region was consistency with the results from the actual extraction.The applications of these methods could provide a foundation for the development of CBM.
引文
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[2]崔若飞,陈同俊,钱进等.利用地震P波确定煤层瓦斯富集带的分布[J].煤田地质与勘探,2007(6)
[3]汤红伟,程健远.深层煤矿床的煤岩样物性测试结果与分析[J].中国煤炭,2009(9)
[4]王兆丰,袁军伟,贾东旭.煤矿高瓦斯带超前判识技术研究[J].河南理工大学学报,2005(1)
[5]李辛子,郭全仕.煤层气地球物理技术研究综述[A].2008年煤层气学术研讨会论文集[C].北京:地质出版社,2008
[6]程五一,张序明,吴福昌.煤与瓦斯突出区域预测理论及技术[M].北京:煤炭工业出版杜,2005
[7]傅学海,秦勇.多项介质煤层气储层渗透率预测理论与方法[M].徐州:中国矿业大学出版社,2003
[8]杨双安,宁书年,张会星.基于双相介质理论的煤层甲烷预测技术[J].煤炭学报,2005(增刊)
[9]刘洪林等.中国高煤阶地区的煤层气勘探理论与实践石油实验地质[J].石油实验地质,2004(5)
[10]Yanghua Wang.Seismic time 2frequency spectral de-composition by matching pursuit[J].Geophysics,2007(1)
[11]徐丽英,徐鸣洁,陈振岩.利用谱分解技术进行薄储层预测[J].石油地球物理勘探,2006(3)
[12]龚洪林,王振卿,李录明.利用地震分频技术预测碳酸盐岩储层[J].地球物理学进展,2008(1)
[13]李劲松,李艳东,张盺.地震谱分解技术在岩性油气藏描述中的应用[J].石油天然气学报,2008(2)
[14]孙鹏远.AVO技术新进展[J].勘探地球物理进展,2005(6)
[15]郭建,宋玉龙.SEG第70届年会论文概要[C].北京:石油工业出版社,2000
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