高密度三维地震观测系统炮检距均匀性评价  

Evaluation of high-density 3D seismic layout offset distance uniformity

作　　者：王超越 董守华[1] WANG Chao-yue;DONG Shou-hua(School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学资源与地球科学学院,徐州221116

出　　处：《地球物理学进展》2020年第6期2220-2227,共8页Progress in Geophysics

基　　金：国家重点研发计划课题(2018YFC0807803)资助。

摘　　要：炮检距均匀性是评价观测系统重要指标之一,均匀的炮检距有利于压制和衰减噪声干扰,有利于接收浅、中、深层反射波,并能提高速度分析精度,炮检距的均匀性可用炮检距的均匀度来评价.在煤田高密度三维地震观测系统设计中提出一种炮检距均匀度计算方法,在定性分析单个面元炮检距均匀性基础上,为了能够定量分析所有面元炮检距分布和采集脚印均匀性,提出了炮检距均方根均匀度、平均均匀度、修正标准差均匀度、最小的和最大的均匀度指标与计算方法.对杨柳矿高密度三维地震区5种观测系统方案的炮检距均匀度分析,试验结果表明,若均方根均匀度和平均均匀度两项指标均为最大值,同时修正标准差均匀度指标为较小值,该观测系统炮检距均匀性是最优的.The offset distance uniformity is one of the important index for evaluating the layout. The uniform offset distance is conducive to suppressing and attenuating noise interference, is favorable for receiving shallow, medium and deep reflection waves, and can improve the accuracy of velocity analysis. The offset distance uniformity can be evaluated by the homogeneous degree of the offset distance. In the design of coalfield high-density three-dimensional(3 D) seismic layout, a method for calculating the homogeneous degree of offset distance is proposed. The offset distance uniformity of single binning is first qualitatively analyzed. Then,calculation methods of the root-mean-square uniformity, average uniformity, corrected standard deviation uniformity, minimum and maximum uniformity for offset distance are proposed. Therefore, it is possible to quantitatively analyze the distribution of offset distance for all binning and the uniformity of the footprints in acquisition. Through the analysis for the offset distance uniformity of 5 layout schemes in the high-density 3 D seismic area of Yangliu Coal Mine. The test results show that when the two indexes of the root mean square uniformity and average uniformity of a layout are the maximum, the standard deviation uniformity index of the correction is the smaller value. The offset distance uniformity of the layout is optimal.

关 键 词：煤田 高密度 炮检距 均匀度 

分 类 号：P631[天文地球—地质矿产勘探]