非零井源距VSP成像方法的改进
|
摘要
非零井源距VSP成像通常采用VSPCDP转换和叠加方法。由于该方法采用射线法深度域建模,并基于层状均匀介质假设和下行波初至,故此法存在以下不足:①很难建立准确的深度域模型;②实际地层存在非均质性,模型地层划分越厚,和实际相差越大;③仅考虑下行波初至的处理方法有可能出现上行波和实际资料传播方向不一致的情况。针对这些问题,本文对非零井源距VSP成像方法作了三点改进:①将最浅检波点以上的均匀层状介质模型改为非均匀连续介质模型;②把深度域建模改为时间域构造格架控制成像;③将单个测点的单独成像改为两个测点联合成像。改进后的非零井源距VSP成像在原理上更加合理、方法上易于实现,其工作效率和成像效果都有明显提高。
The VSPCDP transform and stack method are commonly used for non-zero offset VSP imaging.Since the method uses ray method for model building in depth domain and is on the basis of the hypothesis of layered and uniform medium and down-going first breaks,the method has following shortcomings: ①it is difficult to create accurate model in depth domain;②there is non-homogeneity in practical bed,the thicker the modeled bed is divided,the larger different to real case;③the processing method only considering down-going first breaks may appear the situation that there is non-consistent propagating direction between up-going waves and of real data.In face of these issues,the paper improved the non-zero offset VSP imaging method in three aspects: ①changing uniform layered medium model into non-uniform continuous medium model for the model above the shallowest geophone point;②changing model building in depth domain into imaging controlled by structural framework in time domain;③changing individual imaging at single survey point into joint imaging at two survey points.The improved non-zero offset VSP imaging is more reasonable in principle and easy to implement in method,and there is evident improvement in both work efficiency and imaging results.
The VSPCDP transform and stack method are commonly used for non-zero offset VSP imaging.Since the method uses ray method for model building in depth domain and is on the basis of the hypothesis of layered and uniform medium and down-going first breaks,the method has following shortcomings: ①it is difficult to create accurate model in depth domain;②there is non-homogeneity in practical bed,the thicker the modeled bed is divided,the larger different to real case;③the processing method only considering down-going first breaks may appear the situation that there is non-consistent propagating direction between up-going waves and of real data.In face of these issues,the paper improved the non-zero offset VSP imaging method in three aspects: ①changing uniform layered medium model into non-uniform continuous medium model for the model above the shallowest geophone point;②changing model building in depth domain into imaging controlled by structural framework in time domain;③changing individual imaging at single survey point into joint imaging at two survey points.The improved non-zero offset VSP imaging is more reasonable in principle and easy to implement in method,and there is evident improvement in both work efficiency and imaging results.
引文
[1]朱光明.垂直地震剖面方法.北京:石油工业出版社,1988
[2]魏修成,刘洋.等效连续速度模型在地震资料处理中的应用.勘探地球物理进展,2003,26(4):260~267
[3]张卫红等.VSP转换波成像技术及实例分析.石油物探,2003,42(1):42~48
[4]张公社等.VSP技术在小断块油气田开发中的应用.石油物探,2005,44(4):367~369
[5]冯万奎等.多方位VSP技术在川东寨沟3井目标选择论证中的应用.天然气工业,2006,26(7):43~45
[6]郭旭光等.垂直地震剖面与地面地震联合成像方法.新疆石油地质,2007,28(4):507~509
[7]郭建.VSP技术应用现状及发展趋势.勘探地球物理进展,2004,27(1):1~8
[8]廖成君.VSP技术在锦612复杂断块油藏开发部署研究中的应用.天然气地球科学,2005,16(1):117~122
[2]魏修成,刘洋.等效连续速度模型在地震资料处理中的应用.勘探地球物理进展,2003,26(4):260~267
[3]张卫红等.VSP转换波成像技术及实例分析.石油物探,2003,42(1):42~48
[4]张公社等.VSP技术在小断块油气田开发中的应用.石油物探,2005,44(4):367~369
[5]冯万奎等.多方位VSP技术在川东寨沟3井目标选择论证中的应用.天然气工业,2006,26(7):43~45
[6]郭旭光等.垂直地震剖面与地面地震联合成像方法.新疆石油地质,2007,28(4):507~509
[7]郭建.VSP技术应用现状及发展趋势.勘探地球物理进展,2004,27(1):1~8
[8]廖成君.VSP技术在锦612复杂断块油藏开发部署研究中的应用.天然气地球科学,2005,16(1):117~122
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心