海上全方位观测系统照明  

Illumination of marine full-azimuth survey

作　　者：雷涛[1,2] 顾汉明[1,2] 李列 李添才[4] 方中于[4] 孙波[1,2] 余信江 

机构地区：[1]中国地质大学地球物理与空间信息学院地球内部多尺度成像湖北省重点实验室,武汉430074 [2]中国地质大学构造与油气资源教育部重点实验室,武汉430074 [3]中海石油(中国)有限公司湛江分公司,广东湛江524057 [4]中海油能源发展股份有限公司工程技术物探技术研究所,广东湛江524057

出　　处：《地球物理学报》2016年第2期693-703,共11页Chinese Journal of Geophysics

基　　金：国家重大科技专项(2011ZX05023-004-001)资助

摘　　要：全方位观测系统是目前海上一种可以实现连续环状采集的地震观测系统,它有效扩大目标层上面元的采集方位范围,能够更全面地反映地下构造信息,具有极高的生产效率.本文在波前构建法三维射线追踪技术的基础上,通过获得模拟偏移振幅强度作为照明量,来衡量目标层对不同观测系统的照明响应,为评价和优化不同观测系统提供指导依据.测试结果表明:与平行观测系统相比,全方位观测系统在目标层上的照明能量的连续性和均匀性最好,能够有效地改善平行观测系统下照明阴影区的照明效果,是一种理想的观测系统,可以广泛适用于海上复杂地质环境下的地震采集工作.Full-azimuth survey is a new acquisition geometry that can run continuously linked circles with little or no nonproductive time.It can expand the acquisition azimuth range for the target strata,providing more complete illumination of the subsurface and having very high production efficiency.This work is based on 3Dray modeling by wavefront construction,and then numerically simulated migration amplitude（SMA）.By treating the strength of SMA as illumination intensity,the seismic response of the target layer is measured.Further,we can obtain the level of contribution from different acquisition geometries in the target area.And thismethod can be used to estimate and optimize various acquisition geometries.The result of the numeric model test demonstrates that the illumination of the target strata collected by full azimuth survey has much better continuity and uniformity,improving the illumination intensity at the shadow area acquired by parallel geometries.So the full azimuth survey is a kind of ideal marine surveys,and can be widely used in complex geological environments in offshore exploration.

关 键 词：全方位观测系统 波前构建法 模拟偏移振幅 照明 非生产时间 

分 类 号：P631[天文地球—地质矿产勘探]