Research on Applied Technology with Variable Parameter Iteration Method Research of Two-Dimensional NMR Inversion

Abstract

Two-dimensional NMR has obvious advantages that it is fast and intuitive on identification of reservoir fluid, and it can estimate physical parameters accurately on evaluation, while inversion method of the two-dimensional NMR is the important basis of the logging interpretation work. Through studies about the previous TSVD inversion methods, the truncated standard of the singular value matrix has been improved in order to retain more singular values on the condition number reducing of the inversed equations, meanwhile in iterative process, variable parameter iteration algorithm is proposed to make computing more quick and efficient. In method validation, the inversed diffusion-relaxation two-dimensional NMR spectrum is fitting well with the construct spectrum and the spending time is 57 seconds. The inversed effect of variable parameter iteration method indicates that compared with the TSVD, the new method can give the reliable results very quickly which is highly beneficial for the identification and evaluation of the reservoir fluid, and has certain significance in practical petroleum exploration.