Fracture systems and mesoscale structural patterns in the siliciclastic mesozoic reservoir-caprock succession of the longyearbyen CO2 lab project: Implications for geological CO2 sequestration in central spitsbergen, svalbard
In unconventional, naturally fractured reservoirs, networks of structural discontinuities largely control fluid flow. In this study, we mapped and analysed systematic fracture patterns within the Mesozoic succession of Central Spitsbergen to characterise the reservoir-caprock system explored for geo...
Main Authors: | , , , , |
---|---|
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2014
|
Subjects: | |
Online Access: | http://hdl.handle.net/11588/820209 |
id |
ftunivnapoliiris:oai:www.iris.unina.it:11588/820209 |
---|---|
record_format |
openpolar |
spelling |
ftunivnapoliiris:oai:www.iris.unina.it:11588/820209 2024-04-28T08:27:54+00:00 Fracture systems and mesoscale structural patterns in the siliciclastic mesozoic reservoir-caprock succession of the longyearbyen CO2 lab project: Implications for geological CO2 sequestration in central spitsbergen, svalbard Ogata K. Senger K. Braathen A. Tveranger J. Olaussen S. Ogata, K. Senger, K. Braathen, A. Tveranger, J. Olaussen, S. 2014 http://hdl.handle.net/11588/820209 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000348339100004 volume:94 issue:2-3 firstpage:121 lastpage:154 numberofpages:34 journal:NORSK GEOLOGISK TIDSSKRIFT http://hdl.handle.net/11588/820209 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84921487311 info:eu-repo/semantics/article 2014 ftunivnapoliiris 2024-04-04T17:22:23Z In unconventional, naturally fractured reservoirs, networks of structural discontinuities largely control fluid flow. In this study, we mapped and analysed systematic fracture patterns within the Mesozoic succession of Central Spitsbergen to characterise the reservoir-caprock system explored for geological CO2 storage by the Longyearbyen CO2 Lab project. We carried out and integrated structural and stratigraphic analyses of outcrop and borehole data, subdividing the investigated sedimentary interval into five litho-structural units (LSUs): (A) massive to laminated shales characterised by predominant low-angle fractures, (B) heterogeneous, fine-grained intervals with both lowand high-angled fractures, (C) massive, coarsegrained intervals dominated by high-angle fractures, (D) igneous intrusions characterised by synand post-emplacement fractures and veins, and (E) carbonate beds dominated by high-angle fractures and veins. LSUs are identified on the basis of their fracture associations, lithologies and dominant sedimentary facies, and thus implicitly include information on the primary porosity and permeability. In general, two main, subvertical extensional fracture sets are recognised: (i) a principal fracture set trending approximately NE-SW to ENE-WSW (J1) and (ii) a subordinate fracture set trending about NNW-SSE to NNE-SSW (J2). Conjugate shear fractures (S1) are trending roughly NE-SW and NW-SE in the coarser-grained and more cemented lithologies. A low-angle fracture set (S2) striking approximately NNW-SSE to WNW-ESE is also observed. Variations in fracture patterns suggest that the LSUs are pseudo-mechanical units, which are able to steer, baffle or impede horizontal and vertical fluid migration due to their primary matrix (i.e., grain size and mineralogy) and fracture network properties. At a larger scale, the resultant stratigraphic and structural architecture controls the hydrogeological regime of the investigated reservoir-caprock succession, providing: (1) fracture-related secondary porosity and ... Article in Journal/Newspaper Longyearbyen Svalbard Spitsbergen IRIS Università degli Studi di Napoli Federico II |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Napoli Federico II |
op_collection_id |
ftunivnapoliiris |
language |
English |
description |
In unconventional, naturally fractured reservoirs, networks of structural discontinuities largely control fluid flow. In this study, we mapped and analysed systematic fracture patterns within the Mesozoic succession of Central Spitsbergen to characterise the reservoir-caprock system explored for geological CO2 storage by the Longyearbyen CO2 Lab project. We carried out and integrated structural and stratigraphic analyses of outcrop and borehole data, subdividing the investigated sedimentary interval into five litho-structural units (LSUs): (A) massive to laminated shales characterised by predominant low-angle fractures, (B) heterogeneous, fine-grained intervals with both lowand high-angled fractures, (C) massive, coarsegrained intervals dominated by high-angle fractures, (D) igneous intrusions characterised by synand post-emplacement fractures and veins, and (E) carbonate beds dominated by high-angle fractures and veins. LSUs are identified on the basis of their fracture associations, lithologies and dominant sedimentary facies, and thus implicitly include information on the primary porosity and permeability. In general, two main, subvertical extensional fracture sets are recognised: (i) a principal fracture set trending approximately NE-SW to ENE-WSW (J1) and (ii) a subordinate fracture set trending about NNW-SSE to NNE-SSW (J2). Conjugate shear fractures (S1) are trending roughly NE-SW and NW-SE in the coarser-grained and more cemented lithologies. A low-angle fracture set (S2) striking approximately NNW-SSE to WNW-ESE is also observed. Variations in fracture patterns suggest that the LSUs are pseudo-mechanical units, which are able to steer, baffle or impede horizontal and vertical fluid migration due to their primary matrix (i.e., grain size and mineralogy) and fracture network properties. At a larger scale, the resultant stratigraphic and structural architecture controls the hydrogeological regime of the investigated reservoir-caprock succession, providing: (1) fracture-related secondary porosity and ... |
author2 |
Ogata, K. Senger, K. Braathen, A. Tveranger, J. Olaussen, S. |
format |
Article in Journal/Newspaper |
author |
Ogata K. Senger K. Braathen A. Tveranger J. Olaussen S. |
spellingShingle |
Ogata K. Senger K. Braathen A. Tveranger J. Olaussen S. Fracture systems and mesoscale structural patterns in the siliciclastic mesozoic reservoir-caprock succession of the longyearbyen CO2 lab project: Implications for geological CO2 sequestration in central spitsbergen, svalbard |
author_facet |
Ogata K. Senger K. Braathen A. Tveranger J. Olaussen S. |
author_sort |
Ogata K. |
title |
Fracture systems and mesoscale structural patterns in the siliciclastic mesozoic reservoir-caprock succession of the longyearbyen CO2 lab project: Implications for geological CO2 sequestration in central spitsbergen, svalbard |
title_short |
Fracture systems and mesoscale structural patterns in the siliciclastic mesozoic reservoir-caprock succession of the longyearbyen CO2 lab project: Implications for geological CO2 sequestration in central spitsbergen, svalbard |
title_full |
Fracture systems and mesoscale structural patterns in the siliciclastic mesozoic reservoir-caprock succession of the longyearbyen CO2 lab project: Implications for geological CO2 sequestration in central spitsbergen, svalbard |
title_fullStr |
Fracture systems and mesoscale structural patterns in the siliciclastic mesozoic reservoir-caprock succession of the longyearbyen CO2 lab project: Implications for geological CO2 sequestration in central spitsbergen, svalbard |
title_full_unstemmed |
Fracture systems and mesoscale structural patterns in the siliciclastic mesozoic reservoir-caprock succession of the longyearbyen CO2 lab project: Implications for geological CO2 sequestration in central spitsbergen, svalbard |
title_sort |
fracture systems and mesoscale structural patterns in the siliciclastic mesozoic reservoir-caprock succession of the longyearbyen co2 lab project: implications for geological co2 sequestration in central spitsbergen, svalbard |
publishDate |
2014 |
url |
http://hdl.handle.net/11588/820209 |
genre |
Longyearbyen Svalbard Spitsbergen |
genre_facet |
Longyearbyen Svalbard Spitsbergen |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000348339100004 volume:94 issue:2-3 firstpage:121 lastpage:154 numberofpages:34 journal:NORSK GEOLOGISK TIDSSKRIFT http://hdl.handle.net/11588/820209 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84921487311 |
_version_ |
1797586644236238848 |