Research on Applied-Technology for Capacity with Variable Parameter Iteration Method

Abstract

Two-dimensional NMR spectrum can give reliable conclusion when it is used to identify and evaluate the testing fluid, and two-dimensional NMR inversion method is the key to get the spectrum Aiming at the deficiency of inversed results’ accuracy and computing speed in TSVD method, the variable parameter iteration method is proposed which include the singular value packet processing algorithm that mainly used to lay the foundation for the reliability of the results, and the variable parameter iteration algorithm that mainly used to speed up the iteration computing. In numerical simulation test, the variable parameter iteration method can restore the constructional diffusion-relaxation spectrum accurately and quickly compared with TSVD method. In oil-water experimental test, the spectrum inversed from variable parameter iteration method can identify the types of testing fluid correctly, and the relative error of oil saturation is 0.6% or 1.9% when oil water ratio is 3 to 1 or 1 to 2, the error are small that indicates the accuracy of the results got from the method is high. Variable parameter iteration method can process the real two-dimensional NMR data rapidly and efficiently, and the quality of the inversed diffusion-relaxation spectrum is high, which shows that the method has practical capacity and has the role of guiding the research of new inversion methods.