井间地震资料的频谱分析及其与地面地震资料的联合应用  

Frequency spectrum analysis on crosswell seismic data and the combined application with surface seismic data

作　　者：刘浩杰[1] 魏国华[1] 

机构地区：[1]中国石化股份胜利油田分公司物探研究院,山东东营257022

出　　处：《油气地质与采收率》2008年第5期56-58,共3页Petroleum Geology and Recovery Efficiency

基　　金：山东省博士后科研项目专项经费(200602007)

摘　　要：井间地震单一技术解决问题的局限性制约了其在油田开发中的应用。对井间地震资料频谱随偏移距变化、不同波场处理过程后频谱变化、反射波成像过程后频谱变化等进行了系统的分析,并与对应的地面地震剖面频谱及子波频谱进行了比较,研究了分辨率与频谱特征参数的关系。结果表明:井间地震资料的处理技术和处理成果是可靠的,与地面地震在同一尺度上的性质一致,且存在叠合频带;井间地震资料频谱的变化主要是由于地层对地震波的吸收作用及形成AVA道集时的空间转换和叠加作用;主频、高截频、频宽是实际地震资料分辨率的主要表征参数,高分辨率地震资料的低频信息比低分辨率的少。井间地震资料和地面地震资料的联合应用有其理论的可行性和实现基础,并有多种方式,对于提高对地质目标的分辨能力和分辨可靠性有重要的意义。Limitation of single crosswell seismic technique restricts its application in oilfield development.The changes of frequency spectrum on crosswell seismic data with the shift of offset,different wave field treatment and reflected wave imaging were analyzed systematically.Then the frequency spectrum and the spectrum of wavelet were compared between crosswell seismic profile and surface seismic profile.The relation between resolution and characteristic parameters of the frequency spectrum was studied.The results show that;the processing technology and result on cross-well data is relatively reliable,it has the same property with the surface seism at the same scale and folding frequency band exists;the change of frequency spectrum of crosswell seismic data is caused by absorption of strata on seismic wave and space transfer and superimpose during the formation of AVA gather;the spectrum parameters,which means dominant frequency and high cut-off frequency,spectrum width,can effectively indicate the resolution of seismic data,and the high resolution seism has less information of low frequency than the low resolution seismic;the combined application of crosswell and surface seismic data is feasible,which is significant for the research of high resolution of seism.

关 键 词：井间地震 频谱分析 分辨率 地面地震 联合应用 

分 类 号：P631.4[天文地球—地质矿产勘探]