摘要
山地地区具有复杂的地表地质条件和地下构造,并且地震数据的信噪比较低。山地复杂区块的地震资料处理需要解决三个问题:①建立精确的近地表速度模型,提高静校正精度;②利用多种去噪方法、逐级去噪,在保护有效信号的同时逐步提高信噪比;③结合地质认识构建速度模型,提高速度场精度,改善偏移成像质量。为此,在GeoEast系统上形成了一套以提高静校正精度、信噪比、偏移成像精度等技术为主的成熟处理流程,主要思路是通过变替换速度的高频静校正融合技术,精确反演近地表速度模型,提高静校正高频成像精度;以多方法组合叠前去噪思路为指导,逐步提高资料的信噪比;依据不同构造部位的差异,采用由简单到复杂的建模思路,并结合钻井、测井等资料,开展多信息约束速度建模,提高速度场精度,保证目的层准确成像。
Mountainous areas data is characterized by complex surface and subsurface geological conditions,and relatively low signal-to-noise ratio(SNR).Three problems need to be solved in this kind of areas:(1)Establishing exact near-surface velocity model to improve the statics accuracy;(2)Using various denoising methods to improve the SNR step by step while protecting signals;(3)Combing geological knowledge to build velocitymodel,and improving the velocity field and the migration quality.A processing flow based on improving statics accuracy,SNR,and imaging quality is formed on GeoEast Processing Sub-system.The main steps are as follows:(1)Accurately inversing the near-surface velocity model with high-frequency statics fusion of variable-replacement velocities,and improve the accuracy of high-frequency statics;(2)Improving the SNR gradually by multi denoising methods;(3)According to different structural parts,building multi-information constrained velocity model to improve the velocity field accuracy and ensure target accurate imaging.
作者
臧胜涛
苏勤
王建华
徐兴荣
赵玉合
肖明图
ZANG Shengtao;SU Qin;WANG Jianhua;XU Xingrong;ZHAO Yuhe;XIAO Mingtu(Northwest Branch,Research Institute of Petroleum Exploration&Development,PetroChina,Lanzhou,Gansu 730020,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2018年第A01期62-68,9,共8页
Oil Geophysical Prospecting
关键词
变替换速度
静校正
信噪比
叠前去噪
偏移成像
variable-replacement velocity
statics
signal-to-noise ratio(SNR)
prestack denoising
migration imaging
