倾斜层转换波速度比分析和叠加——潘一煤层Ps波处理的实际应用  

Alanysis of velocity ratio and stacking technique for converted wave of dipping layers: the practical application to Ps wave data processing of Panyi coal layers

作　　者：钱辉[1] 彭苏萍[2] 勾精为[3] 宋同心 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国矿业大学资环系,北京100041 [3]中国煤炭地质总局地球物理勘探研究院,涿州072750 [4]华北油田公司物探研究院,任丘062550

出　　处：《地球物理学进展》2009年第2期565-573,共9页Progress in Geophysics

摘　　要：目前转换波处理主要局限在水平层假设的前提下,使用斜层共转换点叠加有助于缩短处理流程,提高剖面质量.基于射线定律和几何关系,推导出了单一斜层的转换点位置迭代公式和解析表达式.对不同的深度比,速度比和角度正弦对转换点位置的影响作出分析并与平层渐近转换点公式对比.应用斜层方法对单一煤层进行速度比扫描,提取该属性并对煤层叠加成像,比平层假设方法更能反映目的层的变化.进一步使用插值模型使连续层叠加不再使用拼接方式,而是采用逐个采样点归位叠加的方式形成完整意义上的剖面.对实际资料的三个煤层和新生界进行了方法实验,比单一斜层叠加和水平层假设的效果有所提高.At present the presumption for converted wave data processing is confined to flat layers, but the real CCP （Common Converted Point） stack is more preferable to abbreviate procedure for data processing and improve the quality of profiles. Based on ray-path theory and geometry relations, iterated and analytic formulas are deduced for a single dipping layer. For different depth ratios, velocity ratio and sine ratio of dipping angles, the CCP positions are illustrated to compare with the CCP of a flat layer. Utilizing this method for a single dipping coal layer, we scann the velocity ratio and pick this attribut to obtain the staking image, which show more accurate variation of target layers.Nevertheless the artifical jointing of different layers is not betaken to obtain interpolated smooth profile, a point to point stacking technique is aroused to form the integrant sense of the multi-layer CCP stacking profile. The method experiment on real data of three dipping coal layers and one Cenozoic flat layer shows getter image than the flat layer （ACCP） technique.

关 键 词：转换波处理 倾斜煤层 共转换点 CCP叠加 速度比扫描 

分 类 号：P631[天文地球—地质矿产勘探]