【摘要】 针对四川盆地大邑地区复杂的地下构造,构建了该区的地球物理正演模型,利用射线追踪正演及全波场波动方程的正演模拟分析,进行了地震采集参数的论证和三维观测系统的优化选择,进而讨论了采集方法的适应性。研究结果表明,优选的观测系统,能极大地改善剖面的品质和提高地下复杂地质体成像精度。更多还原

【Abstract】 Dayi area in Sichuan basin is characterized by complicated subsurface structures.In the previous exploration,the seismic observation system was not effectively designed for the oil-enriched object area,leading to inconspicuous event set and fault points on the seismic profile and failing to understand structures.In order to clarify the occurrence,property and distribution of two major faults in this area,this paper presents the geophysical forward model of this area,conducts the seismic data acquisition demonstration and the optimization design/selection of the 3-D seismic observation system using ray tracing forward modeling and full wave field equation analysis and discusses the suitability of the data acquisition.The results show that the 3-D seismic observation system optimization design and selection can be able to greatly improve the quality of the seismic profile and the imaging accuracy of geologic bodies in this area.更多还原