Spin echo SPI methods for quantitative analysis of fluids in porous media

摘要

A method of measuring a parameter in a sample by imaging at least a portion of the sample using a spin-echo single-point imaging (SE-SPI) pulse sequence. This method involves applying a pure phase encoding to the SE-SPI pulse sequence, acquiring a multiplicity of echoes, and determining the spatially resolved T2 distribution. In another embodiment, individual echoes are separately phase encoded in a multi-echo acquisition and the SE-SPI pulse sequence is a hybrid SE-SPI sequence. In another embodiment, an external force can be used to build up a distribution of saturations in the sample, and a T2 distribution can be measured for the sample, which is then used to determine a parameter of the sample. A spatially resolved T2 distribution can also be measured and a resulting spatially resolved T2 distribution used to determine the T2 distribution as a function of capillary pressure.

主权项

1. A method of determining a spatially resolved T2 distribution of a sample by imaging at least a portion of the sample using a spin-echo single-point imaging (SE-SPI) pulse sequence comprising the steps of:
(a) applying a pure phase encoding to the SE-SPI pulse sequence; (b) acquiring a multiplicity of spin-echoes; (c) generating a T2 weighted image of each of the spin-echoes using Fourier transform; and (d) determining a spatially resolved T2 distribution for the sample from the images using inverse Laplace transformation.