Organic matter network in post-mature Marcellus Shale: Effects on petrophysical properties

Claudio Delle Piane, Julien Bourdet, Matthew Josh, M. Ben Clennell, William D.A. Rickard, Martin Saunders, Neil Sherwood, Zhongsheng Li, David N. Dewhurst, Mark D. Raven

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Shale samples of the Marcellus Shale from a well drilled in northeastern Pennsylvania were used to study diagenetic effects on the mineral and organic matter and their impact on petrophysical response. We analyzed an interval of high gamma ray and anomalously low electrical resistivity from a high thermal maturity (mean maximum vitrinite reflectance > 4%) part of the shale-gas play. A suite of microanalytical techniques was used to study features of the shale down to the nanoscale and assess the level of thermal alteration of the mineral and organic phases. The samples are organic rich, with total organic carbon contents of 3–7 wt. %; the vast majority of the organic matter was identified as highly porous pyrobitumen. Matrix porosity is also present, especially within the clay aggregates and at the interface between rigid clasts and clay minerals. Mineral- and organic-based thermal maturity indices suggest that during burial the sediment had been exposed to temperatures as high as 285°C (545°F). under these conditions, the residual, migrated organic matter assumed a partially crystalline habit as confirmed by the identification of turbostratic structures via electron microscopy imaging. Experimental dielectric measurements on organic matter–rich samples confirm that the anomalous electrical properties observed in the wire-line logs can be ascribed to the presence of an electrically conductive interconnected network of partially graphitized organic matter. The preservation of porosity suggests that this organic network can contribute not only to the electrical properties but also to the gas flow properties within the Marcellus Shale.

Original languageEnglish
Pages (from-to)2305-2332
Number of pages28
JournalAAPG Bulletin
Volume102
Issue number11
DOIs
Publication statusPublished - 1 Nov 2018

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Shale
Biological materials
shale
Minerals
organic matter
thermal maturity
electrical property
Electric properties
Porosity
porosity
thermal alteration
vitrinite reflectance
mineral
Organic carbon
Clay minerals
electron microscopy
gas flow
Gamma rays
clast
Electron microscopy

Cite this

Piane, C. D., Bourdet, J., Josh, M., Clennell, M. B., Rickard, W. D. A., Saunders, M., ... Raven, M. D. (2018). Organic matter network in post-mature Marcellus Shale: Effects on petrophysical properties. AAPG Bulletin, 102(11), 2305-2332. https://doi.org/10.1306/04121817180
Piane, Claudio Delle ; Bourdet, Julien ; Josh, Matthew ; Clennell, M. Ben ; Rickard, William D.A. ; Saunders, Martin ; Sherwood, Neil ; Li, Zhongsheng ; Dewhurst, David N. ; Raven, Mark D. / Organic matter network in post-mature Marcellus Shale : Effects on petrophysical properties. In: AAPG Bulletin. 2018 ; Vol. 102, No. 11. pp. 2305-2332.
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Piane, CD, Bourdet, J, Josh, M, Clennell, MB, Rickard, WDA, Saunders, M, Sherwood, N, Li, Z, Dewhurst, DN & Raven, MD 2018, 'Organic matter network in post-mature Marcellus Shale: Effects on petrophysical properties' AAPG Bulletin, vol. 102, no. 11, pp. 2305-2332. https://doi.org/10.1306/04121817180

Organic matter network in post-mature Marcellus Shale : Effects on petrophysical properties. / Piane, Claudio Delle; Bourdet, Julien; Josh, Matthew; Clennell, M. Ben; Rickard, William D.A.; Saunders, Martin; Sherwood, Neil; Li, Zhongsheng; Dewhurst, David N.; Raven, Mark D.

In: AAPG Bulletin, Vol. 102, No. 11, 01.11.2018, p. 2305-2332.

Research output: Contribution to journalArticle

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T1 - Organic matter network in post-mature Marcellus Shale

T2 - Effects on petrophysical properties

AU - Piane, Claudio Delle

AU - Bourdet, Julien

AU - Josh, Matthew

AU - Clennell, M. Ben

AU - Rickard, William D.A.

AU - Saunders, Martin

AU - Sherwood, Neil

AU - Li, Zhongsheng

AU - Dewhurst, David N.

AU - Raven, Mark D.

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AB - Shale samples of the Marcellus Shale from a well drilled in northeastern Pennsylvania were used to study diagenetic effects on the mineral and organic matter and their impact on petrophysical response. We analyzed an interval of high gamma ray and anomalously low electrical resistivity from a high thermal maturity (mean maximum vitrinite reflectance > 4%) part of the shale-gas play. A suite of microanalytical techniques was used to study features of the shale down to the nanoscale and assess the level of thermal alteration of the mineral and organic phases. The samples are organic rich, with total organic carbon contents of 3–7 wt. %; the vast majority of the organic matter was identified as highly porous pyrobitumen. Matrix porosity is also present, especially within the clay aggregates and at the interface between rigid clasts and clay minerals. Mineral- and organic-based thermal maturity indices suggest that during burial the sediment had been exposed to temperatures as high as 285°C (545°F). under these conditions, the residual, migrated organic matter assumed a partially crystalline habit as confirmed by the identification of turbostratic structures via electron microscopy imaging. Experimental dielectric measurements on organic matter–rich samples confirm that the anomalous electrical properties observed in the wire-line logs can be ascribed to the presence of an electrically conductive interconnected network of partially graphitized organic matter. The preservation of porosity suggests that this organic network can contribute not only to the electrical properties but also to the gas flow properties within the Marcellus Shale.

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