叠前弹性参数反演方法及其应用  

Pre-stack elastic parameters inversion and its application

作　　者：王维红[1] 林春华[1] 王建民[1] 刘淑芬[2] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]大庆石油学院地球科学学院,黑龙江大庆163318

出　　处：《石油物探》2009年第5期483-487,492,共6页Geophysical Prospecting For Petroleum

基　　金：国家重点基础研究(973)项目(2009CB219307)资助

摘　　要：叠前时间偏移和AVO反演相结合的叠前弹性参数反演技术为岩性和隐蔽性油气藏勘探提供了较为有效的储层识别方法。依据弹性波传播的基本理论和平面纵波入射的反射和透射Zoeppritz方程,给出了计算弹性参数的公式。算法实现的基本原理是:首先将叠前时间偏移的共反射点(CRP)道集转化为角道集;然后基于角道集应用最小平方方法进行优化求解,得到各弹性参数剖面;最后通过计算结果建立地质模型,并进行反演,进而进行储层描述和含油性预测。利用理论模型对叠前弹性参数反演方法进行了验证,结果显示方法的计算误差较小。将方法应用于复杂陆相断陷盆地地震资料反演,并与商业软件的反演结果进行了对比分析,结果表明,叠前弹性参数反演方法的分辨率较高,钻井资料证实其储层预测精度也较高。Pre-stack elastic parameter inversion combines pre-stack time migration and AVO inversion algorithm,which provides an effective reservoir prediction approach for lithological and subtle reservoir exploration.The elastic parameter inversion formula is given according to the fundamental theory of elastic wave propagation and the Zoeppritz equation for plane wave reflection and transmission. The basic principles are as follows:firstly,CRP(common reflection point) gather are transformed into angle gather after prestack time migration;then,least-square method is used to get optimization resolution based on angle gather,and obtain all elastic parameter sections;finally,the reservoir description and hydrocarbon prediction are carried out based on the established geological model by estimated elastic parameters and results from following elastic parameter inversion.The inversion result of theoretical model data demonstrates that the solution error is small.The inversion algorithm was applied to seismic data in complex continental downfaulted basin,comparing to the result of commercial inversion software, we can conclude that the pre-stack elastic parameter inversion has higher resolution,and also,the precision of reservoir prediction is verified to be high by the drilling data.

关 键 词：ZOEPPRITZ方程 弹性参数 角度道集 陆相断陷盆地 叠前反演 

分 类 号：P631.4[天文地球—地质矿产勘探]