| 摘要 |
The present invention concerns a method (100) for measuring the trapped gas saturation in a rock sample, comprising the steps: saturating (101) the porous volume of the rock sample with water; effecting a first imaging phase (102) capable of dividing the sample into a plurality of subsamples and measuring the porosity of each subsample; subjecting the sample of water saturated rock to centrifugation in air (103); effecting a second imaging phase (104) so as to obtain an initial gas saturation map Sgi of the sample; subjecting the rock sample to centrifugation under water (105); effecting a third imaging phase (106) so as to obtain a gas saturation map Sg of the sample; calculating (107) a plurality of Bond number values; associating (108), for each subsample, the gas saturation Sg with the initial gas saturation Sgi and with the Bond number values calculated; identifying (109) the Bond number value beyond which the gas saturation Sg begins to decrease, the value identified representing the critical Bond number; selecting (110) the initial gas saturation values Sgi and gas saturation Sg corresponding to Bond number values lower than the value of said critical Bond number, the gas saturation values Sg selected representing corresponding trapped gas saturation values Sgr. |
