煤炭高密度空间采样地震勘探方法研究及应用效果
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摘要
高密度空间采样地震勘探技术在野外采用单点激发、单点接收,可有效避免野外组合时差对高频的影响及组合产生的接收各向异性问题,并有利于室内对规则干扰进行压制。通过开展高密度空间采样试验,对高密度勘探技术中空间采样密度与分辨率的关系,高密度激发技术、静校正、高保真室内组合方法、噪声压制方法及三维去噪最小数据集抽取方法等关键技术进行了总结。以HNDJ区的高密度地震勘探项目为例,高密度地震勘探获得的新剖面,其各煤层的反射特征都比过去普通三维资料有明显提高,特别是T4波。对该区的高密度空间采样数据利用多种地震属性对断层进行识别,新发现6～8m的断层2条,尤其2m断距的断层显示的也非常清晰,实例表明高密度空间采样地震勘探技术,可提高地震勘探的成像精度。
Single point shooting and receiving are used in high density spatial sampling seismic prospecting in field,thus can avoid field composite moveout impact on high frequency and composite receiving produced anisotropic issues,and in favor of indoor regular interference suppression.Through high density spatial sampling,have summed up key technologies of relation between spatial sampling density and resolution,high density shot,statics and high fidelity indoor composite method,noise suppression method,and 3D denoising minimum data set extraction method.To take the high density seismic prospecting project in HNDJ area as an example,characteristics of each coal seam reflection are obviously improved than past ordinary 3D data,especially the T4 wave.Using multiple seismic attribution technique to identify fault from high density spatial sampled data in the area,has found 2 new faults with 6-8m throw,especially presentation of fault with 2m throw is also very clear.The example has demonstrated that the high density spatial sampling technique can improve imaging precision.
Single point shooting and receiving are used in high density spatial sampling seismic prospecting in field,thus can avoid field composite moveout impact on high frequency and composite receiving produced anisotropic issues,and in favor of indoor regular interference suppression.Through high density spatial sampling,have summed up key technologies of relation between spatial sampling density and resolution,high density shot,statics and high fidelity indoor composite method,noise suppression method,and 3D denoising minimum data set extraction method.To take the high density seismic prospecting project in HNDJ area as an example,characteristics of each coal seam reflection are obviously improved than past ordinary 3D data,especially the T4 wave.Using multiple seismic attribution technique to identify fault from high density spatial sampled data in the area,has found 2 new faults with 6-8m throw,especially presentation of fault with 2m throw is also very clear.The example has demonstrated that the high density spatial sampling technique can improve imaging precision.
引文
[1]Gi js J.O.Vermeer,3-D Seismic Survey Design,Society of Exploration Geophysicists Tulsa,Oklahoma,2002.
[2]Mike Galbraith(*),a new methodology for 3D survey design,Seismic Image Software-A Division of GEDCO
[2]Mike Galbraith(*),a new methodology for 3D survey design,Seismic Image Software-A Division of GEDCO
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