Quantification of Organic Porosity and Water Accessibility in Marcellus Shale Using Neutron Scattering

Xin Gu, David F.R. Mildner, David R. Cole, Gernot Rother, Rudy Slingerland, Susan L. Brantley

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Pores within organic matter (OM) are a significant contributor to the total pore system in gas shales. These pores contribute most of the storage capacity in gas shales. Here we present a novel approach to characterize the OM pore structure (including the porosity, specific surface area, pore size distribution, and water accessibility) in Marcellus shale. By using ultrasmall and small-angle neutron scattering, and by exploiting the contrast matching of the shale matrix with suitable mixtures of deuterated and protonated water, both total and water-accessible porosity were measured on centimeter-sized samples from two boreholes from the nanometer to micrometer scale with good statistical coverage. Samples were also measured after combustion at 450 °C. Analysis of scattering data from these procedures allowed quantification of OM porosity and water accessibility. OM hosts 24-47% of the total porosity for both organic-rich and -poor samples. This porosity occupies as much as 29% of the OM volume. In contrast to the current paradigm in the literature that OM porosity is organophilic and therefore not likely to contain water, our results demonstrate that OM pores with widths >20 nm exhibit the characteristics of water accessibility. Our approach reveals the complex structure and wetting behavior of the OM porosity at scales that are hard to interrogate using other techniques.

Original languageEnglish (US)
Pages (from-to)4438-4449
Number of pages12
JournalEnergy and Fuels
Volume30
Issue number6
DOIs
StatePublished - Jun 16 2016

Fingerprint

Shale
Neutron scattering
Biological materials
Porosity
Water
Gases
Pore structure
Boreholes
Specific surface area
Pore size
Wetting
Scattering

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Gu, Xin ; Mildner, David F.R. ; Cole, David R. ; Rother, Gernot ; Slingerland, Rudy ; Brantley, Susan L. / Quantification of Organic Porosity and Water Accessibility in Marcellus Shale Using Neutron Scattering. In: Energy and Fuels. 2016 ; Vol. 30, No. 6. pp. 4438-4449.
@article{0cce7c8b8c1148c2bd2328f40b40d34f,
title = "Quantification of Organic Porosity and Water Accessibility in Marcellus Shale Using Neutron Scattering",
abstract = "Pores within organic matter (OM) are a significant contributor to the total pore system in gas shales. These pores contribute most of the storage capacity in gas shales. Here we present a novel approach to characterize the OM pore structure (including the porosity, specific surface area, pore size distribution, and water accessibility) in Marcellus shale. By using ultrasmall and small-angle neutron scattering, and by exploiting the contrast matching of the shale matrix with suitable mixtures of deuterated and protonated water, both total and water-accessible porosity were measured on centimeter-sized samples from two boreholes from the nanometer to micrometer scale with good statistical coverage. Samples were also measured after combustion at 450 °C. Analysis of scattering data from these procedures allowed quantification of OM porosity and water accessibility. OM hosts 24-47{\%} of the total porosity for both organic-rich and -poor samples. This porosity occupies as much as 29{\%} of the OM volume. In contrast to the current paradigm in the literature that OM porosity is organophilic and therefore not likely to contain water, our results demonstrate that OM pores with widths >20 nm exhibit the characteristics of water accessibility. Our approach reveals the complex structure and wetting behavior of the OM porosity at scales that are hard to interrogate using other techniques.",
author = "Xin Gu and Mildner, {David F.R.} and Cole, {David R.} and Gernot Rother and Rudy Slingerland and Brantley, {Susan L.}",
year = "2016",
month = "6",
day = "16",
doi = "10.1021/acs.energyfuels.5b02878",
language = "English (US)",
volume = "30",
pages = "4438--4449",
journal = "Energy & Fuels",
issn = "0887-0624",
publisher = "American Chemical Society",
number = "6",

}

Quantification of Organic Porosity and Water Accessibility in Marcellus Shale Using Neutron Scattering. / Gu, Xin; Mildner, David F.R.; Cole, David R.; Rother, Gernot; Slingerland, Rudy; Brantley, Susan L.

In: Energy and Fuels, Vol. 30, No. 6, 16.06.2016, p. 4438-4449.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Quantification of Organic Porosity and Water Accessibility in Marcellus Shale Using Neutron Scattering

AU - Gu, Xin

AU - Mildner, David F.R.

AU - Cole, David R.

AU - Rother, Gernot

AU - Slingerland, Rudy

AU - Brantley, Susan L.

PY - 2016/6/16

Y1 - 2016/6/16

N2 - Pores within organic matter (OM) are a significant contributor to the total pore system in gas shales. These pores contribute most of the storage capacity in gas shales. Here we present a novel approach to characterize the OM pore structure (including the porosity, specific surface area, pore size distribution, and water accessibility) in Marcellus shale. By using ultrasmall and small-angle neutron scattering, and by exploiting the contrast matching of the shale matrix with suitable mixtures of deuterated and protonated water, both total and water-accessible porosity were measured on centimeter-sized samples from two boreholes from the nanometer to micrometer scale with good statistical coverage. Samples were also measured after combustion at 450 °C. Analysis of scattering data from these procedures allowed quantification of OM porosity and water accessibility. OM hosts 24-47% of the total porosity for both organic-rich and -poor samples. This porosity occupies as much as 29% of the OM volume. In contrast to the current paradigm in the literature that OM porosity is organophilic and therefore not likely to contain water, our results demonstrate that OM pores with widths >20 nm exhibit the characteristics of water accessibility. Our approach reveals the complex structure and wetting behavior of the OM porosity at scales that are hard to interrogate using other techniques.

AB - Pores within organic matter (OM) are a significant contributor to the total pore system in gas shales. These pores contribute most of the storage capacity in gas shales. Here we present a novel approach to characterize the OM pore structure (including the porosity, specific surface area, pore size distribution, and water accessibility) in Marcellus shale. By using ultrasmall and small-angle neutron scattering, and by exploiting the contrast matching of the shale matrix with suitable mixtures of deuterated and protonated water, both total and water-accessible porosity were measured on centimeter-sized samples from two boreholes from the nanometer to micrometer scale with good statistical coverage. Samples were also measured after combustion at 450 °C. Analysis of scattering data from these procedures allowed quantification of OM porosity and water accessibility. OM hosts 24-47% of the total porosity for both organic-rich and -poor samples. This porosity occupies as much as 29% of the OM volume. In contrast to the current paradigm in the literature that OM porosity is organophilic and therefore not likely to contain water, our results demonstrate that OM pores with widths >20 nm exhibit the characteristics of water accessibility. Our approach reveals the complex structure and wetting behavior of the OM porosity at scales that are hard to interrogate using other techniques.

UR - http://www.scopus.com/inward/record.url?scp=84975225013&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84975225013&partnerID=8YFLogxK

U2 - 10.1021/acs.energyfuels.5b02878

DO - 10.1021/acs.energyfuels.5b02878

M3 - Article

AN - SCOPUS:84975225013

VL - 30

SP - 4438

EP - 4449

JO - Energy & Fuels

JF - Energy & Fuels

SN - 0887-0624

IS - 6

ER -