观测系统类型及参数对采空区探测的影响
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摘要
常规煤田三维地震勘探观测系统设计时着重于节约采集成本,提高施工效率,往往使用窄方位半束线横向滚动的观测方式,但是对于需精细勘探、采空区发育不规则的矿区,窄方位观测系统对勘探效果的影响还有待分析。笔者采用三维射线追踪算法对采空区进行了正演数值模拟分析,并对不同观测系统在采集脚印、方位角分布、目标采空区的照明度等观测效果进行了深入对比。六种观测系统、九种属性分析结果表明,宽方位45°斜交式观测系统在五个方面都具有较强优势,对采空区地质目标的异常响应最好。
The design of conventional coal mine three-dimensional seismic exploration observation system focuses its attention on saving acquisition cost and improving efficiency of construction,and hence often uses narrow azimuth half beam line horizontal scrolling observation way;nevertheless,for coal mine fine structure exploration in irregularly-developed goaf,the prospecting effect remains doubtful.On the basis of the ray tracing algorithm for three-dimensional goaf numerical model forward based on an analysis of the observation effects of different observation systems in such aspects as acquisition of footprints,azimuth distribution,and target goaf lighting degree,the authors carried out detailed comparison.The analytical results of six kinds of observation systems and nine kinds of attributes show that the wide azimuth 45° oblique type observation system has obvious advantages in five aspects,and its anomaly response to the geological target of the goaf is the best.
The design of conventional coal mine three-dimensional seismic exploration observation system focuses its attention on saving acquisition cost and improving efficiency of construction,and hence often uses narrow azimuth half beam line horizontal scrolling observation way;nevertheless,for coal mine fine structure exploration in irregularly-developed goaf,the prospecting effect remains doubtful.On the basis of the ray tracing algorithm for three-dimensional goaf numerical model forward based on an analysis of the observation effects of different observation systems in such aspects as acquisition of footprints,azimuth distribution,and target goaf lighting degree,the authors carried out detailed comparison.The analytical results of six kinds of observation systems and nine kinds of attributes show that the wide azimuth 45° oblique type observation system has obvious advantages in five aspects,and its anomaly response to the geological target of the goaf is the best.
引文
[1]常锁亮,唐永红,陈强,等.煤田三维地震勘探的观测系统设计现状与讨论[J].中国煤炭地质,2008(9):50-53.
[2]张军华,张帆,郑旭刚,等.地震采集脚印综合评述[J].石油仪器,2007(5):1-4.
[3]赵殿栋,郭建,王咸彬,等.基于模型面向目标的观测系统优化设计技术[J].中国西部油气地质,2006(2):119-122.
[4]郭树祥.地震采集观测系统设计分析与探讨[J].油气地球物理,2009(10):1-11.
[5]高磊,潘树林,尹成,等.复杂地区观测系统分析评价的照明度函数设计[J].地球物理学进展,2012(2):255-262.
[2]张军华,张帆,郑旭刚,等.地震采集脚印综合评述[J].石油仪器,2007(5):1-4.
[3]赵殿栋,郭建,王咸彬,等.基于模型面向目标的观测系统优化设计技术[J].中国西部油气地质,2006(2):119-122.
[4]郭树祥.地震采集观测系统设计分析与探讨[J].油气地球物理,2009(10):1-11.
[5]高磊,潘树林,尹成,等.复杂地区观测系统分析评价的照明度函数设计[J].地球物理学进展,2012(2):255-262.
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