摘要
在常规地震数据时间域处理中,叠前数据经静校正处理后,数据校正到浮动基准面上。在CMP道集内,炮点、检波点均校正到CMP参考平面上,而参考平面随CMP的位置改变而变化,因而破坏了炮、检点静校正量的地表一致性,造成深度偏移数据与速度模型不匹配,严重影响叠前深度偏移处理效果。为此,应用GeoEast处理系统对叠前数据进行低频剥离反静校正处理、地表小平滑面起始偏移等,将时间域处理过的道集重新反校到地表小平滑面,保留时间域高频静校正的优势,恢复了近地表射线的真实路径,并联合回转波表层精细建模,通过GeoEast PkirDMigOffset模块完成最终的基于起伏地表的叠前深度偏移,极大地改善了陆地起伏地表复杂构造成像效果。
In conventional seismic data processing in the time domain,pre-stack data are corrected onto the floating datum after static correction.In the common-midpoint(CMP)gather,shot and receiver points are both corrected onto the CMP reference datum,However,the variation in the reference datum with CMP location jeopardizes the surface consistency of the statics of the shot and receiver points,which further results in the mismatch between the depth-migrated data and the velocity model and ultimately seriously affects the effect of pre-stack depth migration.In this paper,the Geo-East processing system is applied for inverse static correction of pre-stack data by low-frequency separation and the initial migration of the small smooth surface.In this way,gathers processed in the time domain are corrected back onto the floating datum.The advantages of high-frequency static correction in the time domain are retained,and the actual path of near-surface rays is thereby recovered.Then,fine surface modeling with the turning wave is adopted,and pre-stack depth migration based on the undulating surface is finally implemented with the PkirDMigOffset module of GeoEast.The proposed method greatly improves the imaging effect of complex structures on undulating land surfaces.
作者
徐雷良
凡正才
赵国勇
刘建红
张海新
王淑荣
XU Leiliang;FAN Zhengcai;ZHAO Guoyong;LIU Jianhong;ZHANG Haixin;WANG Shurong(Technical R&D Center,Sinopec Geophysical Corporation R&D Center,Nanjing,Jiangsu 211100,China;Research&Development Center,BGP Inc.,CNPC,Zhuozhou,Hebei 072750,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2022年第S01期37-43,8,共8页
Oil Geophysical Prospecting
基金
国家科技重大专项“大型油气田及煤层气开发”(2017ZX05005004-03)
中国石化科技项目“海量地震数据现场质量分析监控及软件”(JP17036)
中石化石油工程有限公司科技项目“海量地震采集质控系统升级及推广应用”(SG20-60K)联合资助
关键词
地表一致性
高低频分离
小平滑面
起伏地表
深度偏移
surface consistency
high-and low-frequency separation
small smooth surface
undulating surface
depth migration
作者简介
徐雷良,高级工程师,1983年生,2005年毕业于东华理工学院获勘查技术与工程专业学士学位,2014年于中国石油大学(华东)获地质工程专业硕士学位,现为SEG协会会员,就职于中石化石油工程地球物理有限公司胜利分公司,主要从事地震采集技术研究与技术管理工作。江苏省南京市江宁区诚信大道2079号中石化石油工程地球物理有限公司科技研发中心,211100。Email:sl-xull.osgc@sinopec.com
