A High-precision Processing Method of Two-dimensional NMR Logging Data Based on Component Compensation

Two-dimensional nuclear magnetic resonance (NMR) technology can perform non-destructive, rapid and quantitative measurement and characterization of various hydrogen-containing fluids in the reservoir, but is limited by the acquisition methods and parameters of NMR equipment. In the detection of samples with ultra-fast relaxation components such as organic matter and asphalt, the problem of missing or inaccurate fluid components in two-dimensional spectrum due to incomplete signal acquisition often occurs. In this paper, a high-precision inversion method of T2-T1 two-dimensional spectrum based on ultrafast relaxation component compensation technology is proposed. This method extends the one-dimensional NMR front-end signal compensation technology. By compensating the components of the echo data before the inversion of two-dimensional NMR data, the problem of signal leakage at the front end of two-dimensional NMR logging can be effectively solved. The application of experiments and logging data shows that this method can obtain more accurate and complete reservoir information in shale oil and other reservoirs rich in signals of fast relaxation components.