参数估计法声波远探测反射波提取效果影响因素研究  

Study on Factors of Influencing Extraction Effect of Reflection Wave in Acoustic Remote Detection Using Parameter Estimation Method

作　　者：蔡明 章成广[1,2] 唐军[1,2] 信毅[3] 曹军涛[3] 赵新建[3] CAI Ming;ZHANG Chengguang;TANG Jun;XIN Yi;CAO Juntao;ZHAO Xinjian(Key Laboratory of Oil and Gas Resources and Exploration Technologies(Yangtze University),Ministry of Education,Wuhan 430100,Hubei,China;College of Geophysics and Petroleum Resources,Yangtze University,Wuhan 430100,Hubei,China;Exploration and Development Research Institute,PetroChina Tarim Oilfield Company,Korla 841000,Xinjiang,China)

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学),湖北武汉430100 [2]长江大学地球物理与石油资源学院,湖北武汉430100 [3]中石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《西安石油大学学报（自然科学版）》2020年第1期42-48,共7页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金(41274141、41774116);油气资源与勘探技术教育部重点实验室(长江大学)开放基金(K2018-03);长江大学青年基金(2016cqn06)

摘　　要：在声波远探测反射波提取方法中,参数估计法应用效果常受多因素影响。对此,分析提炼出了影响参数估计法应用效果的主控因素,并在不同条件下利用该方法对模拟合成的阵列波形进行反射波提取处理,分别研究了波的衰减规律、波的传播速度、接收器的一致性和阵列波形道数对参数估计法反射波提取效果的影响。结果表明,这4种主控因素对参数估计法反射波提取效果均有一定的影响,其中:衰减规律和波速的准确性对处理效果影响尤为明显,衰减规律与实际的衰减规律差别越大,波形反演法处理效果越差甚至失效,波速存在5%的误差时即会导致大量的干扰模式波的残留;接收器的一致性越差处理效果越差;阵列波形道数越多,提取的反射波信噪比越高。Extraction of interested reflections from array acoustic full waveforms is a key procedure in the acoustic remote exploration data processing and interpretation.Parametric estimation method is an effective wave separation method,but its application effect is affected by many factors.In this paper,key factors that affect the application effect of parametric estimation method are analyzed and abstracted;effect of wave attenuation law,wave velocity accuracy,receiver uniformity and array waveform trace number on the application effect of parametric estimation method are researched by using the parametric estimation method to extract interested reflections from synthetic array waveforms under different conditions.Research results show that the above-mentioned four factors are all,to some extent,affect the application effect of parametric estimation method,especially the wave attenuation law and the wave velocity accuracy.The parametric estimation method is invalid or its application effect is bad if the employed wave attenuation law deviates from the actual wave attenuation law,and the more deviation the worse application effect.A large amount of interference signal remains in the interested reflection trace if the relative error of the wave velocity is up to 5%.The poorer receiver uniformity the worse application effect,and more array waveform traces result in interested reflection with a higher signal-to-noise ratio.

关 键 词：反射声波成像测井 反射波提取 参数估计法 

分 类 号：TE122[石油与天然气工程—油气勘探] P631.8[天文地球—地质矿产勘探]