NMR Logging Signal Processing Analysis And Software Development

MRIL-P-type NMR logging tool is one of most advanced nuclear magnetic resonance logging instruments in the world. The data processing technology of MRIL-P-type NMR logging has been thought as the core secret by foreign companies. This research is an independent research and has completely independent intellectual property right.The main contents and results are listed as following:1. This research forms the echo generation technology, carries on study of echo generation technology in the standard logging mode, the differential spectrum logging mode, the shift spectral data logging mode and comprehensive logging mode. and it generates the disorder correction, rotate overlay, phase correction calculation methods.The results generated by echo generation technology are completely consistent with foreign MRIL-P-type NMR processing software(DPP software) results.2. Basing on the previous studies, T2 spectrum inversion was finished by reconstructing the original echo-train of NMR logging data and adding the noise of different signal to noise ratio(SNR). By comparing and analyzing the final result,the MRIL-P-type T2 spectrum inversion method(Improve Dingular Value Decomposition Algorithm)has been formed. The study gets the conclusion that when SNR> 25, no matter the shape of T2 spectrum is unimodal or bimodal, the amplitude and shape of T2 spectrum inversed has a good consistency with the original one.3. On the foundation of calculating the pseudo-capillary pressure, the research finished the calculating method study in average pore throat radius, mean pore throats and some other parameters. This research provides some important parameters for the NMR log interpretation and evaluation.In conclusion, we have achieved several goals by this study in some aspects: 1. We master MRIL-P NMR logging signal processing technologies, and develope a NMR signal processing and analysis software. 2. For the geological features of Sichuan and Chongqing areas, developing the Localization of R & D application software modules, the special technology in pore structure parameter inversion and pore fluid porosity inversion are formed.3. The application of NMR logging tools have been promote and created economic benefits for the company.