【摘要】 多波多分量地震资料解释工作要开展好,确定PS波地震剖面上的地质层位是致关重要的内容之一.实际多波勘探工区中VSP资料常常不充足,甚至缺乏,此时借助PS波合成记录进行PS波层位标定是标定PS波层位的有效方法.为了在实际多波资料解释工作中确定好PS波地震剖面上的地质层位,对中心角度法、角道集叠加法、偏移距道集叠加法、递推法、波动方程正演及伪转换横波反射系数法6种PS波合成记录方法的原理进行了分析.依据研究区的实际地质情况建立了理论模型,对比了6种方法合成PS波记录的效果,表明各种方法合成的PS波记录的波组波系特征相似,只有少许同相轴有能量、波形差异.在实际PS波资料层位标定工作中对6种方法进行了应用研究,表明波动方程正演法、偏移距道集叠加法计算慢,不便于在层位标定工作中使用.递推法、伪转换横波反射系数法速度最快,但振幅近似精度略差.中心角度法、角道集叠加法计算速度和精度都较适应在PS波剖面层位标定工作中使用,并对研究区实际PS波资料进行了较好的标定.同时也提出了在PS波层位标定工作中发展PS波合成记录方法的一些建议,以期PS波井震资料能匹配得更好.更多还原

【Abstract】 In order to accomplish an interpretation of multi-wave multi-component seismic data,specification of geological horizons on PS wave seismic section is one of the vital content.When VSP data are insufficient,even lacking,at multi-wave multi-component exploration field,well-ties of PS wave with synthetic record of PS wave is an efficient method of specification of geological horizon of PS wave.In order to specify correctly geological horizon on real PS wave seismic section in the procedure of interpretation of PS wave,the principle of 6 methods of synthetic record of PS wave are analyzed.These methods include centre angle method,angle gather stack method,offset gather stack method,recursive method,elastic wave equation forward method and pseudo-PS wave reflection coefficients method.A theoretical model based on field geological conditions at research area is established.Model-based comparing of effects of 6 methods for well-ties of PS wave show that synthetic records of PS wave by these methods have the similar characteristics of wave group and wave system,and make only a few of difference of energy and waveform on a little of events.Application study of well-ties of field PS wave data show that forward method based on elastic wave equation and stack method of offset gather compute slowly and are not suitable for well-ties work in the procedure of interpretation of PS wave.Recursive method and pseudo-converted wave reflection coefficients method compute fast,but approximation of amplitudes has some more errors.Center angle method and stack method of angle gather have good compute velocity and accuracy of amplitude,which are suitable for specification of horizons on PS wave section.Well-ties of field PS wave data show a good correlation between synthetic record and seismic traces.Simultaneously,some advices are proposed to develop the method of synthetic records of PS wave on the work of specification of horizons of PS wave to obtain better well-ties of PS wave.更多还原