反演技术在解决煤层顶板岩性应用中的几个重要环节
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摘要
淮南矿区煤层为石炭二叠纪煤层,13-1煤属下石盒子组,煤层全区稳定,平均厚度为3.5m。由于该区视电阻率曲线在砂岩及煤层反映为高电阻率,而泥岩电阻率相对平缓,针对这个特点,利用约束稀疏脉冲反演方法,结合地震数据,重构富含顶底板砂泥岩信息的波阻抗曲线,得到了联井波阻抗剖面及煤层顶板属性切片图,该成果图可清晰反映13-1煤层及顶板以上10m范围内的砂、泥分布。通过该实例的应用,对如何建立地质模型、重构波阻抗的方法、子波估算方法及稀疏脉冲反演中的λ值的选择等几个重要环节进行了剖析。
Coal seams in the Huainan mining area belong to Permo-Carboniferous coal measures.The No.13-1 coal seam is in the Xiashihezi Formation,coal seams in the whole area are stable,average thickness3.5m.Based on apparent resistivity curves of sandstone and coal seam in the area appear as high resistivity,while resistivity of mudstone relatively gentle.In allusion to this character,using constrained sparse pulse inversion combined with seismic data,reconstructed wave impedance curves with rich roof and floor sandstone and mudstone information to get well tie wave impedance sections and coal roof attribution slices.The resulting graph has clearly reflected sandstone and mudstone distribution in No.13-1 coal seam and to 10m above the roof.Through the practical application,has analyzed several important links of how to set up geological model,methods to reconstruct wave impedance,wavelet estimation and λ value selection in constrained sparse pulse inversion.
Coal seams in the Huainan mining area belong to Permo-Carboniferous coal measures.The No.13-1 coal seam is in the Xiashihezi Formation,coal seams in the whole area are stable,average thickness3.5m.Based on apparent resistivity curves of sandstone and coal seam in the area appear as high resistivity,while resistivity of mudstone relatively gentle.In allusion to this character,using constrained sparse pulse inversion combined with seismic data,reconstructed wave impedance curves with rich roof and floor sandstone and mudstone information to get well tie wave impedance sections and coal roof attribution slices.The resulting graph has clearly reflected sandstone and mudstone distribution in No.13-1 coal seam and to 10m above the roof.Through the practical application,has analyzed several important links of how to set up geological model,methods to reconstruct wave impedance,wavelet estimation and λ value selection in constrained sparse pulse inversion.
引文
[1]邹振醒,杨文采.地震道的广义线性反演[J].石油地球物理勘探,1987,22(4):363-376.
[2]李庆忠.论地震约束反演的策略[J].石油地球物理勘探,1998,33(4).
[2]李庆忠.论地震约束反演的策略[J].石油地球物理勘探,1998,33(4).
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