A relationship between rock physics and nuclear magnetic resonance

Abstract

Historically nuclear magnetic resonance (NMR) is used as a useful tool in petrophysical based reservoir evaluation. The objective of this study is to define a relationship between NMR T 2 distribution and seismic attributes for accurately rock properties prediction. To define rock properties, we used laboratory NMR and ultrasonic measured data, rock physics, and AVO analysis. From this study, we define the following relationship: where,  total is the total porosity, and are the Lame` parameters related with P-impedance and S-impedance, T 2i is the NMR T 2 distribution of each pore, V PFM is the volume of pore-filling mineral (PFM), Sg is the gas saturation, R  is the or S-reflection coefficient, R  is the (reflection coefficient. This study shows that NMR T 2 distributions are directly related with seismic attributes. Therefore, integrating NMR data with rock physics analysis provides a solid basis for quantitative seismic petrophysical interpretation by minimizing interpretation risk.

Study on a New Method for Calculating Water Saturation

“…Currently, there are nuclear magnetic logs that provide accurate water saturation data. However, due to the high cost, the calculation of water saturation mainly comes from conventional logging data [7][8]. Therefore, how to use conventional logging data to improve the accuracy of water saturation calculation is still the direction of researchers' efforts [9][10][11].…”