【摘要】 针对三湖地区盐岩区近地表结晶互层多而厚等难点,通过表层精细调查在结晶互层区优选最佳激发井深是提高地震采集资料品质的关键所在。首先定量分析了该区近地表介质的Q值特征;建立了工区实际近地表模型,对结晶互层进行激发模拟。接着介绍了用于该区近地表调查的微测井面积调查方法;研究提出了结合微测井初至时间、波形、能量以及Q值变化进行表层结构精细解释的三步分层法。最后,基于精细近地表分层和正演模拟结果,制定了盐岩区地震采集新的激发井深设计原则。盐岩区表层调查方法和激发井深设计优化技术研究成果在实际资料采集中取得了很好的应用效果,成功解决了复杂盐岩区的激发难题。更多还原

【Abstract】 Salt beds are characterized by much and thick crystal interbedding at the near surface in Sanhu Area.By surface investigation,selecting optimal shooting depth in crystal interbedding area is the key for improving the quality of seismic acquisition data.Firstly,we quantitatively analyze the Q-value of near-surface media,establish the actual near-surface model,and carry out shooting simulation on crystal interbedding area.Then,we describe the uphole areal investigation method for the near-surface investigation in the area,and propose three-step layering method for the fine interpretation of surface structures which combines uphole first break,wave shape,and energy and Q-value variation.Finally,based on the near-sruface fine layered and shooting simulation results,we draw up new design principles for shooting depth in salt beds.The surface investigation and optimal shooting depth design are adopted in actual data acquisition,which obtains good results and successfully solve the shooting difficulty in complex salt beds.更多还原