【摘要】 在塔里木盆地奥陶系碳酸盐岩储集层识别中,地震波"串珠状"反射是十分重要的响应特征之一。通过波动方程正演模拟技术,分别从溶洞形状、观测系统、溶洞组合方式变化等方面设计不同模型,分析了溶洞响应形成机理及对响应的影响因素。分析结果表明,随溶洞宽度的增加,"串珠"响应振幅增强,但响应纵向长度不变;随着溶洞高度的增加",串珠"振幅呈先增大后减小的趋势;高密度采集较常规观测系统对小尺度溶洞体有较好的成像效果,分辨率较高;溶洞不同的叠置方式对应不同的地震响应特征。这些认识,为进一步研究溶洞的响应机理、溶洞形状与"串珠"特征的关系提供了一种手段。更多还原

【Abstract】 The "string beads" reflection characteristic is one of important seismic phenomena in identification of carbonation reservoirs of the Ordovician in Tarim basin.Base on forward modeling of wave equation,the difference models for karst cave shape,observation system,cave mode are designed,and the mechanism and its influence factors of the cavern seismic response are analyzed.The result shows that amplitude of "string beads" response is enhanced with cave width increasing,but the length of "string beads" doesn’t change;the amplitude of "string beads" first increases and then decreases with cave height increasing;High-density acquisition has better imaging performance and resolution to the small-sized body compared with the conventional observation system.Different response characteristics are corresponding with different patterns of superimposed caves.These understandings provide a means for studying the relationship between the response mechanism and shape of karst cave and the characteristic of "string beads".更多还原