摘要
陆架浅水区是我国海洋油气勘探的主战场.对于陆架浅水区地震资料,自由表面多次波为主要的多次波类型.浅水区自由表面多次波能量强、周期短、阶次高,近偏移距处直达波和海底反射难以区分的特点使得基于反馈迭代的自由表面多次波压制方法或是基于多次波周期性的预测反褶积方法应用效果不佳.本文将自由表面多次波分为水层(海面和海底间)多次波和非水层多次波.对于水层多次波,使用确定性水层多次波压制方法,该方法能够适应浅水区较差的近偏移距插值结果.阐述了方法原理及实现过程.在水层多次波压制后切除海底,使用传统的反馈迭代多次波压制方法来压制非水层自由表面多次波.来自东海陆架盆地的实际数据处理结果表明这一处理思路能较好地压制自由表面多次波,有助于提升陆架浅水区地震资料的成像质量.
The shallow continental shelf is the main area of marine hydrocarbon resource exploration in china. The main type of multiple in this area is surface-related multiple. The surface-related multiple in the shallow water area has the characteristic of strong amplitude,short period and high order. we can＇t recognize the seabed reflection from the direct wave in the near offset range. Neither the Surface-Related Multiple Elimination（SRME）based on feedback iteration approach nor the predictive deconvolution based on the periodicity of multiple is effective to the surface-related multiple. The surface-related multiple can be divided into water-layer multiple（downward and upward path between the sea surface and bottom） and non-water-layer multiple. The Deterministic Water-layer Demultiple （DWD） method,which adapted to the poor extrapolate result in the near offset range,can be used to suppress the water-layer multiple. We described the main principles and implementation of DWD method. After the water-layer multiple removal with DWD approach, we muted the seafloor reflection and then suppressed the rest part with the traditional SRME. The actual data processing results from the east china sea shelf basin showed that the surface-related multiple can be suppressed effectively combined with DWD and SRME and the seismic imaging quality from shallow water area of continental shelf was improved.
出处
《地球物理学进展》
CSCD
北大核心
2017年第2期902-910,共9页
Progress in Geophysics
基金
国家自然科学基金(41476053
41506084)
国土资源部海洋油气资源和环境地质重点实验室基金(MRE201314)
中国地质调查项目(DD20160152)共同资助
关键词
海洋地震勘探
自由表面多次波
确定性水层多次波
陆架浅水区
marine seismic exploration
surface-related multiple
deterministic water-layer multiple
shallow water area of continental shelf
