地震反演技术在煤田勘探中的应用探讨
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摘要
煤炭企业对地质安全保障的期望越来越高,特别是对查清煤层赋存形态、构造、煤层厚度、煤层顶底板条件、岩浆岩侵蚀范围等方面的要求已远超规范。以岩心、测井为约束条件的波阻抗反演,可有效提高目标地质体的预测精度。Jason反演所导出的结果是一宽频带的反射系数序列和宽频带的波阻抗数据,同时加入了低频分量,使反演结果能正确地反映地层变化规律。实例表明,在波阻抗剖面上,不仅可以预测出煤层厚度的变化趋势,而且可以反映煤层夹矸及围岩的变化规律及煤层受岩浆岩侵蚀的范围。
The expectations of geological security safeguards from coal enterprises are getting higher and higher,especially in aspects of identifying coal seam hosting pattern,structure,coal thickness,coal roof and floor conditions,magmatic intrusion range etc.are far beyond prospecting specification requirements.The wave impedance inversion taking the coal and rock cores,well logging as the constrained conditions can improve target geologic body prediction accuracy.The Jason inversion derived results have wide-band reflection coefficient sequence and wide-band wave impedance data,together with low-frequency constituents,thus the results can reflect strata variation pattern exactly.Examples demonstrated that,on the wave impedance section,not only can predict coal thickness variation trend,but also can reflect coal seam gangue,surrounding rock variation pattern and the range of magmatic intrusion into coal seam.
The expectations of geological security safeguards from coal enterprises are getting higher and higher,especially in aspects of identifying coal seam hosting pattern,structure,coal thickness,coal roof and floor conditions,magmatic intrusion range etc.are far beyond prospecting specification requirements.The wave impedance inversion taking the coal and rock cores,well logging as the constrained conditions can improve target geologic body prediction accuracy.The Jason inversion derived results have wide-band reflection coefficient sequence and wide-band wave impedance data,together with low-frequency constituents,thus the results can reflect strata variation pattern exactly.Examples demonstrated that,on the wave impedance section,not only can predict coal thickness variation trend,but also can reflect coal seam gangue,surrounding rock variation pattern and the range of magmatic intrusion into coal seam.
引文
[1]林建东,霍全明,吴奕峰.多井约束三维地震反演技术在煤厚预测中的应用[J].中国煤田地质,2003,15(3):43-45.
[2]崔若飞,孙学凯,崔大尉.基于地震反演方法的奥陶系顶部含隔水层探测[J].岩石力学与工程学报,2009,28(2):319-323.
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[5]许崇宝,测井约束地震反演分辨率及反演策略探讨[J].中国煤炭地质.2010.22(8):39-41.
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[2]崔若飞,孙学凯,崔大尉.基于地震反演方法的奥陶系顶部含隔水层探测[J].岩石力学与工程学报,2009,28(2):319-323.
[3]赵铭海.常用叠后波阻抗反演技术评析[J].油气地质与采收率,2004,11(1):36-38.
[4]冯斌.Jason测井约束反演在桩106地区河道含油气砂体预测中的应用[J].浙江大学学报(工学版),2003,37(6):707-710.
[5]许崇宝,测井约束地震反演分辨率及反演策略探讨[J].中国煤炭地质.2010.22(8):39-41.
[6]陆基孟.地震勘探原理[M].北京:石油大学出版社,2001.
[7]陈民振.中国煤矿物探研究[M].北京:地质出版社,2006.
[8]李增学,马兴祥.实用矿井地质研究[M].北京:地质出版社,1993.
[9]崔若飞,孙学凯,崔大尉.地震反演———煤田地震勘探的新进展[J].中国煤炭地质,2008,18(06).
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