论文详情
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 pre-stack 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.