A decomposition method of nuclear magnetic resonance T2 spectrum for identifying fluid properties
作者：ZHONG Jibin,YAN Ronghui,ZHANG Haitao,FENG Yihan,LI Nan,LIU Xingjun
摘要：Based on analysis of NMR T2 spectral characteristics,a new method for identifying fluid properties by decomposing T2 spectrum through signal analysis has been proposed.Because T2 spectrum satisfies lognormal distribution on transverse relaxation time axis,the T2 spectrum can be decomposed into 2 to 5 independent component spectra by fitting the T2 spectrum with Gauss functions.By analyzing the free relaxation response characteristics of crude oil and formation water,the dynamic response characteristics of the core mutual drive between oil and water,the petrophysical significance of each component spectrum is clarified.T2 spectrum can be decomposed into clay bound water component spectrum,capillary bound fluid component spectrum,micropores fluid component spectrum and macropores fluid component spectrum.According to the nature of crude oil in the target area,the distribution range of T2 component spectral peaks of oil-bearing reservoir is 165-500 ms on T2 time axis.This range can be used to accurately identify fluid properties.This method has high adaptability in identifying complex oil and water layers in low porosity and permeability reservoirs.
發文機構：Exploration and Development Research Institute of PetroChina Changqing Oilfield Company National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields PetroChina Changqing Oilfield Company Changqing Branch Technology Center
關鍵詞：nuclearmagneticresonancefreerelaxationT2spectrumdecompositionmethodfittedT2spectrumcomponentspectrumfluididentification
分類號： P618.13[天文地球—礦床學]
- Enrichment and exploration of deep lacustrine shale oil in the first member of Cretaceous Qingshankou Formation, southern Songliao Basin, NE China
- A coupled model of temperature and pressure based on hydration kinetics during well cementing in deep water
- Scaled physical experiments on drainage mechanisms of solvent-expanded SAGD in super-heavy oil reservoirs
- Diagenetic evolution and formation mechanisms of middle to deep clastic reservoirs in the Nanpu sag, Bohai Bay Basin, East China
- Artificial neural network based production forecasting for a hydrocarbon reservoir under water injection
- An evaluation method of volume fracturing effects for vertical wells in low permeability reservoirs
- Main flow channel index in porous sand reservoirs and its application
- Effects of vugs on resistivity of vuggy carbonate reservoirs
- Pore-throat structure characteristics and its impact on the porosity and permeability relationship of Carboniferous carbonate reservoirs in eastern edge of Pre-Caspian Basin
- Structural failure mechanism and strengthening method of fracture plugging zone for lost circulation control in deep naturally fractured reservoirs