摘要
随着琼东南盆地深水区油气勘探不断深入,过去单块地震资料因采集、处理技术不同造成各块资料品质差异,无法满足勘探整体评价的要求。针对上述问题,从炮集资料出发,采用统一的技术流程,使用组合多次波衰减技术压制深水多次波,进行全区连片匹配处理,统一资料品质,改善中深层信噪比。在较高信噪比基础上,基于深水沉积结构、地层速度规律等约束条件建立叠前深度偏移(PSDM)初始速度模型,运用高精度网格层析速度反演技术更新速度场,最终得到合理、高精度的PSDM速度场,有效改善了叠前深度偏移成像质量。该技术有效解决了深水区三维资料品质不统一的问题,改善了中深层成像效果,并在生产实践中取得了显著的应用效果。
With the progress of oil and gas exploration in deep water areas of the western South China Sea, single pieces of 3-D seismic data, which have inconsistent quality caused by different acquisition factors and processing techniques, is no longer able to meet the requirements of overall exploration and resource evaluation. To solve the problem, we applied the matching and concatenating processing technique combined with multiple suppression technique to unify data quality and improve the signal to noise ratio for the middle to deep layer. Initial velocity modeling, which is constrained by strata velocity in deep water area, was then established on this basis. Grid tomography of high precision was applied to improve imaging accuracy. The results showed that the problem of inconsistent data quality in deep water area was solved and the imaging of the middle to deep layer was much improved.
作者
宋爱学
王利杰
杨金海
刘明珠
SONG Aixue;WANG Lijie;YANG Jinhai;LIU Mingzhu(Zhanjiang Branch of CNOOC, Zhanjiang 524057, Guangdong, China;South China Sea Institute of Oceanology, Chinese Academy of Science, Guangzhou 510301, China;Geohysical Department, E~-D Research Institute, Energy Technology ＆ Services Co. , CNOOC Zhanjiang Ltd. ,Zhanjiang 524057, Guangdong, China)
出处
《海洋地质前沿》
CSCD
2018年第7期56-64,76,共10页
Marine Geology Frontiers
基金
国家科技重大专项"琼东南盆地深水区大中型气田形成条件及勘探关键技术"(2016ZX05026-002)
关键词
深水区
匹配连片处理
组合多次波压制
速度模型
网格层析速度反演
琼东南盆地
deep water area
matching and concatenating processing
combination of multiple suppres-sion technique
velocity modeling
Grid tomography
Qiongdongnan Basin
