Towards Experimental Measurement of Methane Adsorption Isotherm in Shale Reservoirs

Solatpour, Razieh; Kantzas, Apostolos

doi:10.11159/icmfht19.118

Cited by 2 publications

(7 citation statements)

References 10 publications

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“…The first peak in the T 2 distributions in Figure arriving at or before 1 ms represents gas adsorbed to the core, which was the same as in a packed activated carbon column, crushed coal ,,, samples, and whole core samples, as described above.…”

Section: Resultsmentioning

confidence: 99%

“…The maxima of the first peaks are within a relatively small range, between 0.18 and 0.25 ms (Table 3), indicating the peak timing is controlled by the same process. The first peak in the T 2 distributions in Figure 4 arriving at or before 1 ms represents gas adsorbed to the core, which was the same as in a packed activated carbon column, 30 crushed coal 24,29,49,50 samples, and whole core samples, 27 as described above.…”

Section: Steady State Nmr Measurementsmentioning

confidence: 99%

“…A study of methane flooding a column packed with activated carbon identified the first peak, before 1 ms, to be adsorbed methane, and subsequent peaks were related to the pore size distribution of the packed activated carbon. 30 Zhou et al 27 used low-field NMR to measure the distribution of methane in shale and identified the first peak in the T 2 spectrum, between 0.1 and 1 ms, as adsorbed methane. The second peak, from 3 to 20 ms, represents the free methane in pores controlled by surface relaxation, while the T 2 spectrum from 80 to 110 ms represents the free methane in fractures governed by bulk relaxation.…”

Section: Steady State Nmr Measurementsmentioning

confidence: 99%

“…The first peak represents the gas adsorbed to the rock, the second peak is the gas in the pores, the third peak is the gas in larger fractures, and the fourth peak is the gas surrounding the sample. Other studies have also correlated the measured NMR signals to the interaction of gases with rock samples, as well as sand packs and activated carbon …”

Section: Introductionmentioning

confidence: 99%

“…Other studies have also correlated the measured NMR signals to the interaction of gases with rock samples, 27 as well as sand packs and activated carbon. 30 The NMR approach equilibrates a sample with a hydrocarbon gas and then carries out the measurements to quantify the adsorbed gas and the pore gas in the sample. Once the measurements are completed at one pressure, the pressure is increased, and the measurements are conducted again at the new pressure.…”

Section: Introductionmentioning

confidence: 99%

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Quantifying Gas Storage and Transport in an Intact Core Sample Using Low-Field NMR and Pressure Measurements

Heagle,

Walsh,

Sgro

et al. 2023

Energy Fuels

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Quantifying gas movement through low-permeability rocks is important for shale gas resource evaluation as well as characterizing cap rocks for reservoirs storing natural gas, carbon dioxide, and hydrogen gas. In this study, we used an established NMRbased method to determine the ethane gas adsorption isotherm for an intact core plug of Bakken shale, with measurements carried out at 0.3, 1.4, 2.8, and 4.2 MPa. The results showed that there was ten times more ethane mass adsorbed to the sample compared to the ethane mass in the pores at 4.2 MPa. Next, we expanded the methodology to take advantage of the steady state between the core plug and gas in the NMR sample chamber at 4.2 MPa. The chamber was rapidly degassed to a gauge pressure of 0.061 MPa and shut-in. NMR measurements were used to quantify the gas adsorbed to the rock and the gas in the pores of the rock, while gas pressure measurements were made until the pressure reached a new steady state of 0.14 MPa after 21 h. The NMR measurements showed that one-third of the ethane measured at 4.2 MPa remained sorbed to the rock, indicating two-thirds of the ethane had desorbed. A numerical model of the degassing core was created by using TOUGH2 to simulate the desorption of ethane from the core and the movement of ethane out of the core by advection and diffusion. The model confirmed the affinity for ethane to remain adsorbed to the rock even when the pressure was lowered, suggesting enhanced gas recovery techniques may be required to remove a larger proportion of adsorbed gas in tight shale formations. The understanding of adsorption/desorption, permeability, effective porosity, and diffusion coefficient can be applied to reservoir models at reservoir conditions to improve estimates of gas recovery in tight rock reservoirs.

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