海拉尔盆地铜钵庙南地区三维地震资料叠前深度偏移处理

Pre-stack Depth Migration Processing of 3D Seismic Data for Tongbo Temple Southern Area in Haila'er Basin

海拉尔盆地铜钵庙南地区构造破碎、断块发育、地层倾角大、速度横向变化大,导致地震成像难度大,储层纵横向变化快、油水关系复杂,在常规地震资料处理结果上难以准确识别构造,无法满足解释要求,三维叠前深度偏移技术成为提高该地区地震资料成像精度的首选技术。分析了该区域的地质特征及勘探面临的问题及地震资料的特点和成像难点,并给出相应技术对策,即剩余静校正技术、偏移速度模型建立技术及三维叠前深度偏移的参数选取,展示了三维叠前深度偏移技术应用效果。结果表明,三维地震资料深度成像技术能够大幅度提高地震成像质量,有利于构造识别。

Tongbo temple southern area in Haila'er basin is characterized by kataclastic structure,fault block development,large dip angle and significant horizontal velocity variation,resulting in difficult seismic imaging,significant horizontal reservoir variation,and complex oil-water relationship.The previous characteristics have made it hard to interpret the structure accurately with the conventional seismic data processing;hence the pre-stack depth migration processing of 3D seismic data is preferred.According to the geologic characteristics,exploration issues and seismic data properties and imaging difficulty,the corresponding technical solution is advanced,that is,residual correction technique,migration velocity model technology and parameter selection for pre-stack depth migration,demonstrating the effective results of pre-stack depth migration.It indicates that pre-stack depth migration processing of 3D seismic data greatly improves seismic image quality.