三维地震技术在煤层顶板稳定性研究中的应用
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摘要
龙固井田为全隐蔽的华北型煤田,位于巨野煤田中部,其首采扩大区主采煤层为3号煤层。考虑3煤层顶板稳定性主要受其顶板的构造信息和岩性信息影响,因此首先依据三维地震勘探综合解释成果及波阻抗反演解释成果对二者进行定量化,然后对波阻抗数据进行归一化处理,使得波阻抗数据和量化后的构造数据具有相同的变化范围及等量贡献。在此距离范围内构造和岩性的权值各为0.5,依此生成综合因素煤层顶板稳定性隶属度。分析3煤层顶板以上10m、20m处的综合因素煤层顶板稳定性隶属度图可以发现,该区3煤层顶板稳定性比较好,且其稳定性主要是受构造因素控制,岩性因素相对影响较小。
The Longgu minefield is in the middle part of Juye coalfield,a fully covered North China typed coalfield,the No.3 coal is the main mineable coal seam in extended initial winning district.In view of No.3 coal roof stability is mainly influenced by roof structure and lithology,therefore quantizing the two factors first,through 3D seismic prospecting comprehensive interpretation and wave impedance inversion interpretation,then normalized wave impedance data,made the impedance data and quantized structure data have identical range of variation and equal contribution.In this distance range,structural and lithological weights are each 0.5,on this ground produced composite factorial coal roof stability membership grade.Analyzed the composite factorial coal roof stability membership grade curves of 10m,20m above No.3 coal roof can find out that the stability of No.3 coal roof is rather good and mainly controlled by structural factors,while lithological factors have relatively less influences.
The Longgu minefield is in the middle part of Juye coalfield,a fully covered North China typed coalfield,the No.3 coal is the main mineable coal seam in extended initial winning district.In view of No.3 coal roof stability is mainly influenced by roof structure and lithology,therefore quantizing the two factors first,through 3D seismic prospecting comprehensive interpretation and wave impedance inversion interpretation,then normalized wave impedance data,made the impedance data and quantized structure data have identical range of variation and equal contribution.In this distance range,structural and lithological weights are each 0.5,on this ground produced composite factorial coal roof stability membership grade.Analyzed the composite factorial coal roof stability membership grade curves of 10m,20m above No.3 coal roof can find out that the stability of No.3 coal roof is rather good and mainly controlled by structural factors,while lithological factors have relatively less influences.
引文
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[5]沈财余,江洁,赵华,等.测井约束地震反演解决地质问题能力的探讨[J].石油地球物理勘探.2002,37(4).
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