Marini, M, Patacci, M, Felletti, F et al. (1 more author) (2016) Fill to spill stratigraphic evolution of a confined turbidite mini-basin succession, and its likely well bore expression: The Castagnola Fm, NW Italy. Marine and Petroleum Geology, 69. pp. 94-111. ISSN 0264-8172
Abstract
This study documents the stratigraphic evolution of the Castagnola ponded turbidite mini-basin through analysis of a detailed base-to-top section measured in the central part of the basin. Vertical variations in facies characteristics, thickness ratio of mud cap vs. sandstone of event beds and net/gross are argued to be good proxies for pinpointing the stratigraphic transition from dominantly ponded deposition, where most of the flow is trapped by the confining topography, to a flow-stripping - dominated phase in which an increasingly large part of incoming flows can escape the basin by spilling over the enclosing topography. Thickness statistics of sandstones and mud caps of event beds from the case study show that in the initial stage of turbidite deposition only part of the mud of exceptionally large volume flows escaped the confining topography; as the basin was progressively infilled, nearly all inbound flows were affected by flow stripping, with part of the sand and most of the mud escaping the basin. In the latest recorded stage of deposition the abundance of by-pass features coupled with significant modification of the sandstone bed thickness population suggests that the turbidite system was no longer obstructed frontally, and could step forward onto a healed topography. In order to assess whether the documented trends of turbidite bed characteristics indicative of the 'fill to spill' transition could be recognised from wireline log data alone, synthetic logs were prepared by up-scaling the field data to resolutions typical of borehole geophysical log data. Vertical trends of average bed thickness and net/gross recognisable in the synthetic data suggest that the transition from ponded to spill-dominated situations should be resolvable in geophysical log data.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2015 Elsevier Ltd. All rights reserved. This is an author produced version of a paper published in Marine and Petroleum Geology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Turbidity currents; Topographic confinement; Flow ponding; Flow stripping; Fill and spill; Turbidite mini-basin; Borehole logs |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 20 Jan 2016 15:54 |
Last Modified: | 25 Oct 2016 03:17 |
Published Version: | http://dx.doi.org/10.1016/j.marpetgeo.2015.10.014 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.marpetgeo.2015.10.014 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:93822 |