煤田地质与勘探2023，Vol.51Issue(12)：83-92,10.DOI:10.12363/issn.1001-1986.23.10.0629
复杂地形深地震反射数据采集参数优化
Optimization of data acquisition parameters for deep seismic reflection surveys in complex terrain
摘要
Abstract
Fujian,located in the orogen region of the coastal areas of southeast China,exhibits well-developed struc-tures and complex surface conditions,which make deep seismic reflection surveys challenging.In response to the di-versity and complexity of seismogeological conditions in Fujian,this study optimized the seismic excitation means based on previous deep seismic surveys.Specifically,the combination of large,medium,and small guns was transitioned into the layout of normal guns(spacing of shot points:600 m)and large shots(spacing of shot points:15 km),leading to en-hanced folds of large shots.Through simulation analysis,this study calculated the spacing of combined boreholes,aim-ing to concentrate the excitation energy and generate seismic elastic waves with the maximum efficiency.It optimized the dominant frequency of the nodal seismometers for data acquisition,reducing it from 10 Hz to 5 Hz to improve the resolution of data on the middle-deep crust in seismic records.Furthermore,this study increased the number of receiv-ing channels from 1 200 to 2 400,achieving a maximum offset of 36 km.This value exceeds the depth of the Moho in Fujian,allowing for the acquisition of the reflection signals of deeper parts.After the optimization of the seismic acquisi-tion parameters,the obtained original single-shot seismic records and initially stacked time sections featured high signal-to-noise ratios.The optimization also contributed to clear reflected waves of the middle-deep crust and the Moho,as well as high imaging accuracy of the crustal structure.As a result,the expected geological survey effects were achieved.The newly obtained data parameters can provide a reference for deep seismic reflection surveys in similar areas.关键词
复杂地形/深地震反射/采集参数/观测系统/莫霍面/福建Key words
complex terrain/deep seismic reflection/acquisition parameter/observation system/Moho/Fujian分类
天文与地球科学引用本文复制引用
晏云翔,贾晋,李培,智敏,刘建达,王子琛,张颖,裴跟弟,李林元,牟棋..复杂地形深地震反射数据采集参数优化[J].煤田地质与勘探,2023,51(12):83-92,10.基金项目
中煤科工西安研究院(集团)有限公司科技创新项目(2022XAYJS07) （集团）
