摘要
涠西地区断层发育,构造复杂,地层横向变化大,各向异性明显。各向异性介质中地震波有特殊的传播方式,各向同性偏移方法在解决偏移归位问题上效果差,成像质量不能确保。因此,基于各向同性的叠前深度偏移数据对小断层刻画不清楚,导致储层精细刻画难度大,砂体预测、流体预测的准确度不够高。为了解决各向同性存在的问题,文章研究方法基于各向异性偏移理论,利用各向异性建模技术可以提高成像精度、落实多级断层和构造、提高资料信噪比和分辨率、满足目的层储层预测和精细油藏研究认识需要。通过对靶区各向异性叠前深度偏移处理,效果对比各向同性,边界断层成像更加清晰,断层与周围地层的接触关系更加清楚,波组特征更活跃,小断裂更加干脆,内幕细节更丰富,基底刻画更合理。断裂和基底部分各向异性处理效果十分明显,为精细地质解释和反演提供了更好的地震资料。
In Weixi area,there are lots of faults developing,with its structures complex,strata transverse change great and anisotropy obvious.In anisotropic media,seismic waves have special propagation laws.Isotropic migration methods are ineffective in solv-ing migration problems,and image quality can not be guaranteed.Therefore,it’s hard to identify the tiny faults based on isotropic prestack depth migration data.Consequently,the description of the sand body and fluid prediction is inaccurate.Anisotropic velocity modeling could be used to solve this problem,which can improve the S/N ratio,resolution,image quality and well describe faults and structure.Finally,the demand of reservoir prediction and detailed reservoir geology research could be met.The anisotropic prestack depth migration processing results in Weixi area is better than that of isotropy results.The image quality of the boundary faults is bet-ter and the contact relationship between the faults and the surrounding strata is clearer.The wave features are more active,the inner structure details are richer and the basement description is more reasonable.In sum,the improvement of processing results provides better seismic data for detailed reservoir geological interpretation and inversion.
作者
李振伟
全心怡
张天炬
杨鹏程
LI Zhenwei;QUAN Xinyi;ZHANG Tianju;YANG Pengcheng(Institute of Exploration and Development,SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai 200120,China)
出处
《海洋石油》
CAS
2019年第3期21-26,共6页
Offshore Oil
关键词
各向异性
叠前深度偏移
速度建模
涠西
anisotropy
prestack depth migration
velocity modeling
Weixi area
