Modal Quantitative Logs for the Objective Recording and Analysis of Very Thick Sedimentary Sequences
The quantitative logs method is designed for objective facies analysis of thick sedimentary successions. This method enables the analysis of whole successions instead of selected intervals arbitrarily considered as representative and results in a database suitable for further analysis, e.g., statist...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-05-01
|
| Series: | Minerals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-163X/13/5/675 |
| _version_ | 1797598908784836608 |
|---|---|
| author | Marek Wendorff Andrzej Świąder Ireneusz Felisiak |
| author_facet | Marek Wendorff Andrzej Świąder Ireneusz Felisiak |
| author_sort | Marek Wendorff |
| collection | DOAJ |
| description | The quantitative logs method is designed for objective facies analysis of thick sedimentary successions. This method enables the analysis of whole successions instead of selected intervals arbitrarily considered as representative and results in a database suitable for further analysis, e.g., statistical, quantitative stratigraphy, or facies modelling. The logging procedure involves the following steps: (i) each of the logged sedimentary features is classified according to a standard, e.g., grain-size follows the phi scale or Wentworth classes are applied for bed thickness; (ii) in the course of logging, the whole succession is subdivided into intervals, each of which is characterised by a predominant (i.e., modal) class of the considered feature; (iii) such modal class characterises a part of the section that has a specific thickness and is called a ‘modally homogeneous interval’ (MHI); and (iv) the lower and upper boundary of each MHI are defined by a change in the modal class. The thickness of all MHIs characterised by the same class interval is then added. The grand total of such component sub-totals for all class intervals of the logged feature equals the log thickness and is the basis for the calculation of frequency distribution, which characterises the succession from the viewpoint of this feature. Each bar of the resulting histogram represents the percentage of the whole section composed of the strata among which the given class occurs as the modal (i.e., predominant) feature. The method of modal quantitative logs is illustrated here with an example of statistical analysis of selected sections of the Krosno Beds (Oligocene) turbidite succession from the Western Outer Carpathians of Poland. |
| first_indexed | 2024-03-11T03:27:16Z |
| format | Article |
| id | doaj.art-4685c1c6d16b4a9d988c12831b8f8325 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T03:27:16Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-4685c1c6d16b4a9d988c12831b8f83252023-11-18T02:36:58ZengMDPI AGMinerals2075-163X2023-05-0113567510.3390/min13050675Modal Quantitative Logs for the Objective Recording and Analysis of Very Thick Sedimentary SequencesMarek Wendorff0Andrzej Świąder1Ireneusz Felisiak2Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewcza 30, 30-063 Kraków, PolandFaculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewcza 30, 30-063 Kraków, PolandFaculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewcza 30, 30-063 Kraków, PolandThe quantitative logs method is designed for objective facies analysis of thick sedimentary successions. This method enables the analysis of whole successions instead of selected intervals arbitrarily considered as representative and results in a database suitable for further analysis, e.g., statistical, quantitative stratigraphy, or facies modelling. The logging procedure involves the following steps: (i) each of the logged sedimentary features is classified according to a standard, e.g., grain-size follows the phi scale or Wentworth classes are applied for bed thickness; (ii) in the course of logging, the whole succession is subdivided into intervals, each of which is characterised by a predominant (i.e., modal) class of the considered feature; (iii) such modal class characterises a part of the section that has a specific thickness and is called a ‘modally homogeneous interval’ (MHI); and (iv) the lower and upper boundary of each MHI are defined by a change in the modal class. The thickness of all MHIs characterised by the same class interval is then added. The grand total of such component sub-totals for all class intervals of the logged feature equals the log thickness and is the basis for the calculation of frequency distribution, which characterises the succession from the viewpoint of this feature. Each bar of the resulting histogram represents the percentage of the whole section composed of the strata among which the given class occurs as the modal (i.e., predominant) feature. The method of modal quantitative logs is illustrated here with an example of statistical analysis of selected sections of the Krosno Beds (Oligocene) turbidite succession from the Western Outer Carpathians of Poland.https://www.mdpi.com/2075-163X/13/5/675logging methodsquantitative analysisturbidites |
| spellingShingle | Marek Wendorff Andrzej Świąder Ireneusz Felisiak Modal Quantitative Logs for the Objective Recording and Analysis of Very Thick Sedimentary Sequences Minerals logging methods quantitative analysis turbidites |
| title | Modal Quantitative Logs for the Objective Recording and Analysis of Very Thick Sedimentary Sequences |
| title_full | Modal Quantitative Logs for the Objective Recording and Analysis of Very Thick Sedimentary Sequences |
| title_fullStr | Modal Quantitative Logs for the Objective Recording and Analysis of Very Thick Sedimentary Sequences |
| title_full_unstemmed | Modal Quantitative Logs for the Objective Recording and Analysis of Very Thick Sedimentary Sequences |
| title_short | Modal Quantitative Logs for the Objective Recording and Analysis of Very Thick Sedimentary Sequences |
| title_sort | modal quantitative logs for the objective recording and analysis of very thick sedimentary sequences |
| topic | logging methods quantitative analysis turbidites |
| url | https://www.mdpi.com/2075-163X/13/5/675 |
| work_keys_str_mv | AT marekwendorff modalquantitativelogsfortheobjectiverecordingandanalysisofverythicksedimentarysequences AT andrzejswiader modalquantitativelogsfortheobjectiverecordingandanalysisofverythicksedimentarysequences AT ireneuszfelisiak modalquantitativelogsfortheobjectiverecordingandanalysisofverythicksedimentarysequences |