Research and application of seismic forward simulation technology in deep reflection seismic profile detection
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摘要: 地震波正演模拟技术广泛应用于浅层勘探,此方法可以将地质模型和地震模型有机结合起来,验证和指导地震资料的采集、处理和解释。基于石油反射地震技术发展起来的深反射地震剖面探测技术,经过几十年的发展及应用,已经非常成熟,但到目前为止,地震波正演技术在深反射地震剖面探测中的应用却很少。本文利用跨越四川盆地深反射地震剖面来开展正演研究,通过对比拟合正演模拟数据和实际地震数据的层位到时,不断修正速度、层位等参数,建立最终深度域地质模型,为构造剖面提供较为准确的地壳厚度、莫霍面深度等地层信息。通过深度域地质模型,揭示出扬子板块西北缘新元古代古俯冲的角度约30°,俯冲的深度达到60 km。Abstract: Seismic wave forward modeling technology is widely used in shallow exploration.This method can combine geological model and seismic model organically to verify and guide the acquisition,processing and interpretation of seismic data.The deep reflection seismic profile detection technology based on the oil reflection seismic technology has been very mature after decades of development and application.But up to now,the application of seismic wave forward modeling in deep reflection seismic profile is very insufficient.In this paper,the deep reflection seismic profile across Sichuan Basin was used to carry out forward modeling.By comparing and fitting the horizon of forward simulation data and actual seismic data,the parameters such as velocity and horizon were constantly modified,and the final depth domain geological model was established,which provides more accurate stratigraphic information such as crustal thickness and Moho depth for structural profile.Through the geological model in depth domain,it is revealed that the angle of Neoproterozoic paleosubduction in the northwest margin of Yangtze plate was about 30 °,and the depth of subduction reached 60 km.
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Key words:
- forward modeling /
- deep reflection seismic /
- geological model /
- ray tracing /
- Moho
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