Rock Classification Using Multivariate Analysis of Measurement While Drilling Data: Towards a Better Sampling Strategy
Measurement while drilling (MWD) data are gathered during drilling operations and can provide information about the strength of the rock penetrated by the boreholes. In this paper MWD data from a marble open-pit operation in northern Norway are studied. The rock types are represented by discrete cla...
Published in: | Minerals |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
MDPI
2018
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2586946 https://doi.org/10.3390/min8090384 |
id |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2586946 |
---|---|
record_format |
openpolar |
spelling |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2586946 2023-05-15T17:43:33+02:00 Rock Classification Using Multivariate Analysis of Measurement While Drilling Data: Towards a Better Sampling Strategy Sajith Vezhapparambu, Veena Eidsvik, Jo Ellefmo, Steinar Løve 2018 http://hdl.handle.net/11250/2586946 https://doi.org/10.3390/min8090384 eng eng MDPI Norges forskningsråd: 236638 Minerals. 2018, 8 (9), . urn:issn:2075-163X http://hdl.handle.net/11250/2586946 https://doi.org/10.3390/min8090384 cristin:1637312 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no CC-BY 23 8 Minerals 9 Journal article Peer reviewed 2018 ftntnutrondheimi https://doi.org/10.3390/min8090384 2019-09-17T06:54:33Z Measurement while drilling (MWD) data are gathered during drilling operations and can provide information about the strength of the rock penetrated by the boreholes. In this paper MWD data from a marble open-pit operation in northern Norway are studied. The rock types are represented by discrete classes, and the data is then modeled by a hidden Markov model (HMM). Results of using different MWD data variables are studied and presented. These results are compared and co-interpreted with optical televiewer (OTV) images, magnetic susceptibility and spectral gamma values collected in the borehole using down-the-hole sensors. A model with penetration rate, rotation pressure and dampening pressure data show a good visual correlation with OTV image for the studied boreholes. The marble class is characterized by medium penetration rate and medium rotation pressure, whereas the intrusions are characterized by low penetration rate and medium to high rotation pressure. The fractured marble is characterized by high penetration rate, high rotation and low dampening pressure. Future research will use the presented results to develop a heterogeneity index, develop an MWD-based 3D-geology model and an improved sampling strategy and investigate how to implement this in the mine planning process and reconciliation. publishedVersion (C) 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Article in Journal/Newspaper Northern Norway NTNU Open Archive (Norwegian University of Science and Technology) Norway Minerals 8 9 384 |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
description |
Measurement while drilling (MWD) data are gathered during drilling operations and can provide information about the strength of the rock penetrated by the boreholes. In this paper MWD data from a marble open-pit operation in northern Norway are studied. The rock types are represented by discrete classes, and the data is then modeled by a hidden Markov model (HMM). Results of using different MWD data variables are studied and presented. These results are compared and co-interpreted with optical televiewer (OTV) images, magnetic susceptibility and spectral gamma values collected in the borehole using down-the-hole sensors. A model with penetration rate, rotation pressure and dampening pressure data show a good visual correlation with OTV image for the studied boreholes. The marble class is characterized by medium penetration rate and medium rotation pressure, whereas the intrusions are characterized by low penetration rate and medium to high rotation pressure. The fractured marble is characterized by high penetration rate, high rotation and low dampening pressure. Future research will use the presented results to develop a heterogeneity index, develop an MWD-based 3D-geology model and an improved sampling strategy and investigate how to implement this in the mine planning process and reconciliation. publishedVersion (C) 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
format |
Article in Journal/Newspaper |
author |
Sajith Vezhapparambu, Veena Eidsvik, Jo Ellefmo, Steinar Løve |
spellingShingle |
Sajith Vezhapparambu, Veena Eidsvik, Jo Ellefmo, Steinar Løve Rock Classification Using Multivariate Analysis of Measurement While Drilling Data: Towards a Better Sampling Strategy |
author_facet |
Sajith Vezhapparambu, Veena Eidsvik, Jo Ellefmo, Steinar Løve |
author_sort |
Sajith Vezhapparambu, Veena |
title |
Rock Classification Using Multivariate Analysis of Measurement While Drilling Data: Towards a Better Sampling Strategy |
title_short |
Rock Classification Using Multivariate Analysis of Measurement While Drilling Data: Towards a Better Sampling Strategy |
title_full |
Rock Classification Using Multivariate Analysis of Measurement While Drilling Data: Towards a Better Sampling Strategy |
title_fullStr |
Rock Classification Using Multivariate Analysis of Measurement While Drilling Data: Towards a Better Sampling Strategy |
title_full_unstemmed |
Rock Classification Using Multivariate Analysis of Measurement While Drilling Data: Towards a Better Sampling Strategy |
title_sort |
rock classification using multivariate analysis of measurement while drilling data: towards a better sampling strategy |
publisher |
MDPI |
publishDate |
2018 |
url |
http://hdl.handle.net/11250/2586946 https://doi.org/10.3390/min8090384 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
23 8 Minerals 9 |
op_relation |
Norges forskningsråd: 236638 Minerals. 2018, 8 (9), . urn:issn:2075-163X http://hdl.handle.net/11250/2586946 https://doi.org/10.3390/min8090384 cristin:1637312 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3390/min8090384 |
container_title |
Minerals |
container_volume |
8 |
container_issue |
9 |
container_start_page |
384 |
_version_ |
1766145656077942784 |