Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results
This paper part one is set out to lay primary observations of experimental compaction measurements to form the basis for rock physics modelling in paper part two. P‐ and S‐wave velocities and corresponding petrophysical (porosity and density) properties of seven unconsolidated natural sands with dif...
Published in: | Geophysical Prospecting |
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Blackwell Publishing
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ftoslouniv:oai:www.duo.uio.no:10852/73413 2023-05-15T15:39:10+02:00 Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results Narongsirikul, Sirikarn Mondol, Nazmul Haque Jahren, Jens 2019-05-23T11:25:45Z http://hdl.handle.net/10852/73413 http://urn.nb.no/URN:NBN:no-76549 https://doi.org/10.1111/1365-2478.12744 EN eng Blackwell Publishing http://urn.nb.no/URN:NBN:no-76549 Narongsirikul, Sirikarn Mondol, Nazmul Haque Jahren, Jens . Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results. Geophysical Prospecting. 2019, 67, 804-824 http://hdl.handle.net/10852/73413 1699714 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geophysical Prospecting&rft.volume=67&rft.spage=804&rft.date=2019 Geophysical Prospecting 67 4 804 824 https://doi.org/10.1111/1365-2478.12744 URN:NBN:no-76549 Fulltext https://www.duo.uio.no/bitstream/handle/10852/73413/1/Narongsirikul_etal%2B%25282019%2529Postprint%2B2020-02-07.pdf 0016-8025 Journal article Tidsskriftartikkel Peer reviewed AcceptedVersion 2019 ftoslouniv https://doi.org/10.1111/1365-2478.12744 2020-06-21T08:53:40Z This paper part one is set out to lay primary observations of experimental compaction measurements to form the basis for rock physics modelling in paper part two. P‐ and S‐wave velocities and corresponding petrophysical (porosity and density) properties of seven unconsolidated natural sands with different mineralogical compositions and textures are reported. The samples were compacted in a uniaxial strain configuration from 0.5 up to 30 MPa effective stresses. Each sand sample was subjected to three loading cycles to study the influence of stress reduction on acoustic velocities and rock physical properties with the key focus on simulating a complex burial history with periods of uplift. Results show significant differences in rock physical properties between normal compaction and overconsolidation (unloaded and reloaded). The differences observed for total porosity, density, and P‐ and S‐wave velocities are attributed to irrecoverable permanent deformation. Microtextural differences affect petrophysical, acoustic, elastic and mechanical properties, mostly during normal consolidation but are less significant during unloading and reloading. Different pre‐consolidation stress magnitudes, stress conditions (isotropic or uniaxial) and mineral compositions do not significantly affect the change in porosity and velocities during unloading as a similar steep velocity–porosity gradient is observed. The magnitude of change in the total porosity is low compared to the associated change in P‐ and S‐wave velocities during stress release. This can be explained by the different sensitivity of the porosity and acoustic properties (velocities) to the change in stress. Stress reduction during unloading yields maximum changes in the total porosity, P‐ and S‐wave velocities of 5%, 25%, and 50%, respectively. These proportions constitute the basis for the following empirical (approximation) correlations: Δϕ ∼ ±5 ΔVP and ΔVP ∼ ±2ΔVS. The patterns observed in the experiments are similar to well log data from the Barents Sea. Applications to rock physics modelling and reservoir monitoring are reported in a companion paper. Article in Journal/Newspaper Barents Sea Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Barents Sea Geophysical Prospecting 67 4 804 824 |
institution |
Open Polar |
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Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
This paper part one is set out to lay primary observations of experimental compaction measurements to form the basis for rock physics modelling in paper part two. P‐ and S‐wave velocities and corresponding petrophysical (porosity and density) properties of seven unconsolidated natural sands with different mineralogical compositions and textures are reported. The samples were compacted in a uniaxial strain configuration from 0.5 up to 30 MPa effective stresses. Each sand sample was subjected to three loading cycles to study the influence of stress reduction on acoustic velocities and rock physical properties with the key focus on simulating a complex burial history with periods of uplift. Results show significant differences in rock physical properties between normal compaction and overconsolidation (unloaded and reloaded). The differences observed for total porosity, density, and P‐ and S‐wave velocities are attributed to irrecoverable permanent deformation. Microtextural differences affect petrophysical, acoustic, elastic and mechanical properties, mostly during normal consolidation but are less significant during unloading and reloading. Different pre‐consolidation stress magnitudes, stress conditions (isotropic or uniaxial) and mineral compositions do not significantly affect the change in porosity and velocities during unloading as a similar steep velocity–porosity gradient is observed. The magnitude of change in the total porosity is low compared to the associated change in P‐ and S‐wave velocities during stress release. This can be explained by the different sensitivity of the porosity and acoustic properties (velocities) to the change in stress. Stress reduction during unloading yields maximum changes in the total porosity, P‐ and S‐wave velocities of 5%, 25%, and 50%, respectively. These proportions constitute the basis for the following empirical (approximation) correlations: Δϕ ∼ ±5 ΔVP and ΔVP ∼ ±2ΔVS. The patterns observed in the experiments are similar to well log data from the Barents Sea. Applications to rock physics modelling and reservoir monitoring are reported in a companion paper. |
format |
Article in Journal/Newspaper |
author |
Narongsirikul, Sirikarn Mondol, Nazmul Haque Jahren, Jens |
spellingShingle |
Narongsirikul, Sirikarn Mondol, Nazmul Haque Jahren, Jens Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results |
author_facet |
Narongsirikul, Sirikarn Mondol, Nazmul Haque Jahren, Jens |
author_sort |
Narongsirikul, Sirikarn |
title |
Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results |
title_short |
Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results |
title_full |
Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results |
title_fullStr |
Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results |
title_full_unstemmed |
Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results |
title_sort |
acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results |
publisher |
Blackwell Publishing |
publishDate |
2019 |
url |
http://hdl.handle.net/10852/73413 http://urn.nb.no/URN:NBN:no-76549 https://doi.org/10.1111/1365-2478.12744 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
0016-8025 |
op_relation |
http://urn.nb.no/URN:NBN:no-76549 Narongsirikul, Sirikarn Mondol, Nazmul Haque Jahren, Jens . Acoustic and petrophysical properties of mechanically compacted overconsolidated sands: part 1 – experimental results. Geophysical Prospecting. 2019, 67, 804-824 http://hdl.handle.net/10852/73413 1699714 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geophysical Prospecting&rft.volume=67&rft.spage=804&rft.date=2019 Geophysical Prospecting 67 4 804 824 https://doi.org/10.1111/1365-2478.12744 URN:NBN:no-76549 Fulltext https://www.duo.uio.no/bitstream/handle/10852/73413/1/Narongsirikul_etal%2B%25282019%2529Postprint%2B2020-02-07.pdf |
op_doi |
https://doi.org/10.1111/1365-2478.12744 |
container_title |
Geophysical Prospecting |
container_volume |
67 |
container_issue |
4 |
container_start_page |
804 |
op_container_end_page |
824 |
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1766370630560645120 |