Pore Architecture and Connectivity in Gas Shale

King, H. E.; Eberle, Aaron P. R.; Walters, Clifford C.; Kliewer, Chris E.; Ertaş, Deniz; Huynh, Chuong

doi:10.1021/ef502402e

Cited by 183 publications

(149 citation statements)

References 69 publications

Supporting

Mentioning

138

Contrasting

Unclassified

Order By: Relevance

“…This might suggest that, at correlation distances much greater than 10 mm, the pores within the rock tend on average to become less anisotropic. This could also be an artifact of measurement close to the incident beam, and indeed some researchers (King et al, 2015) discount data below Q = 1 Â 10 À4 Å À1 on account of multiple scattering caused by thicker samples than used here. Whatever the reason, this does not contradict the fact that the smaller scale pores are anisotropic, as shown by the SANS results.…”

mentioning

confidence: 95%

Ultra-small-angle neutron scattering with azimuthal asymmetry

Mildner

2016

J Appl Cryst

View full text Add to dashboard Cite

Small-angle neutron scattering (SANS) measurements from thin sections of rock samples such as shales demand as great a scattering vector range as possible because the pores cover a wide range of sizes. The limitation of the scattering vector range for pinhole SANS requires slit-smeared ultra-SANS (USANS) measurements that need to be converted to pinhole geometry. The desmearing algorithm is only successful for azimuthally symmetric data. Scattering from samples cut parallel to the plane of bedding is symmetric, exhibiting circular contours on a two-dimensional detector. Samples cut perpendicular to the bedding show elliptically dependent contours with the long axis corresponding to the normal to the bedding plane. A method is given for converting such asymmetric data collected on a double-crystal diffractometer for concatenation with the usual pinhole-geometry SANS data. The aspect ratio from the SANS data is used to modify the slit-smeared USANS data to produce quasi-symmetric contours. Rotation of the sample about the incident beam may result in symmetric data but cannot extract the same information as obtained from pinhole geometry.

show abstract

mentioning

confidence: 95%

Ultra-small-angle neutron scattering with azimuthal asymmetry

Mildner

2016

J Appl Cryst

View full text Add to dashboard Cite

show abstract

“…Shale media possesses a complex pore architecture [20]. Thus, the uniform capillary model does not adequately account for the heterogeneity of shale.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Analysis of Pore Size Distribution Effects on Shale Apparent Permeability

Tian

Ren

et al. 2017

Geofluids

View full text Add to dashboard Cite

Apparent permeability is an important input parameter in the simulation of shale gas production. Most apparent permeability models assume a single pore size. In this study, we develop a theoretical model for quantifying the effect of pore size distribution on shale apparent permeability. The model accounts for the nonuniform distribution of pore sizes, the rarefaction effect, and gas characteristics. The model is validated against available experimental data. Theoretical calculations show that the larger the pore radius, the larger the apparent permeability. Moreover, the apparent permeability increases with an increase in the width of pore size distribution, with this effect being much more pronounced at low pressure than at high pressure.

show abstract

“…With this technique, not only the amount of adsorbed gas stored in reservoir could be obtain, it also depicts the whole dynamic process of gas transport in unconventional rocks. As the reservoir bed and source rock, shale reservoirs are complex and anisotropic geologic systems, which makes it difficult but important to describe the dynamic process of shale gas production (Hill et al, 2007;Strapoc et al, 2010;Chen et al, 2011;Bustin and Bustin, 2012;Zhang et al, 2012;King Jr et al, 2015). In this study, investigations are made on the characterization of fluids flow in unconventional porous rocks.…”

Section: Introductionmentioning

confidence: 99%

Review on gas flow and recovery in unconventional porous rocks

Lin

Wang

Yuan

et al. 2017

Adv. Geo-Energ. Res.

View full text Add to dashboard Cite

This study summarizes gas flow process in unconventional porous rocks, including the transportation in tight or shale reservoirs and the spontaneous imbibition happened in them. Fluids flow is greatly affected by the pore structure together with the pore size distribution of porous media. The MRI and BET measurement show peaks in pore throat radius ranging from 2 to 20 nm, whereas the diameter for methane and helium are 0.38 and 0.26 nm, respectively. Yet for different types of reservoir, distinct mechanisms should be utilized based on the flow regimes. Besides, experimental measurement techniques for conventional reservoirs are no long accurate enough for most of the unconventional reservoirs. New attempts have been implemented to obtain more valuable data for accurate reservoir prediction. By reviewing large numbers of articles, a clear and comprehensive map on the gas flow and recovery in unconventional reservoirs is made. Factors influencing the gas flow and recovery are investigated in detail for mathematical simulation process. Reservoir conditions and the sweep efficiency play an important role during gas production process. Besides, adsorbed gas contributes a lot to the total gas recovery. The overall investigations suggest that many parameters that influence the gas flow in unconventional porous rocks should be taken into consideration during the evaluation. Among them, permeability, adsorbed gas dynamics, stimulated reservoir volume as well as the unstimulated reservoir volume, and imbibition effect are the most important ones. This study provides valuable data and reasonable exploitations for characterizing gas flow and recovery in unconventional porous rocks.

show abstract

Pore Architecture and Connectivity in Gas Shale

Cited by 183 publications

References 69 publications

Ultra-small-angle neutron scattering with azimuthal asymmetry

Ultra-small-angle neutron scattering with azimuthal asymmetry

A Theoretical Analysis of Pore Size Distribution Effects on Shale Apparent Permeability

Review on gas flow and recovery in unconventional porous rocks

Contact Info

Product

Resources

About