摘要
近年兴起的海上拖缆全方位地震采集技术可高效地采集到全方位角地震记录,提高了复杂地质构造的成像质量。本文从圆形采集路径的公式推导出发,进行海上全方位圆形采集路径观测系统的设计;并从覆盖次数、炮检距、方位角、采集脚印等方面对全方位圆形采集和窄方位直线形采集路径做均匀性分析;然后以M深水区三维典型地质模型为实例,利用射线追踪照明技术对比了圆形采集路径观测系统与宽方位观测系统在目的层的模拟偏移振幅。均匀性分析和射线追踪照明对比的结果均表明:全方位圆形采集路径观测系统比常规平行采集观测系统更具优势。
High-efficiency streamer seismic acquisitions can be carried out with recently developed full-azimuth geometry,and better complex structure images can be obtained from this full-azimuth data.We design and evaluate full-azimuth circular geometry for marine seismic in the paper.First we derivate equations of circular tracks,and design a fullazimuth circular geometry.Then we analyze the uniformity for coverage,offset,azimuth,and footprint by comparing full-azimuth circular geometry with narrow azimuth straight line geometry.After that,based on a typical geological model of the deep water area M,we use a circular geometry and a wide-azimuth geometry,and ray tracing illumination to compare their simulated migrated amplitude at targets.Both uniformity analysis and illumination results show that full-azimuth circular geometry have more advantages than conventional parallel geometry.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2015年第6期1042-1047,1029,共6页
Oil Geophysical Prospecting
基金
国家重大科技专项课题“南海深水区油气勘探地球物理关键技术”(2011ZX05025-001)
水利部“984”课题(201409)资助
