Imperial College London
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Dr Margaret "Daisy" Pataki

Central Faculty, Centre for Languages, Culture and Communication

Teaching Fellow in Global Challenges
 
 
 
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m.pataki

 
 
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Location

 

S311Sherfield BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Koehn:2016:10.1016/j.sedgeo.2016.10.007,
author = {Koehn, D and Rood, MP and Beaudoin, N and Chung, P and Bons, PD and Gomez-Rivas, E},
doi = {10.1016/j.sedgeo.2016.10.007},
journal = {Sedimentary Geology},
pages = {60--71},
title = {A new stylolite classification scheme to estimate compaction and local permeability variations},
url = {http://dx.doi.org/10.1016/j.sedgeo.2016.10.007},
volume = {346},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We modeled the geometrical roughening of bedding-parallel, mainly layer-dominated stylolites in order to understand their structural evolution, to present an advanced classification of stylolite shapes and to relate this classification to chemical compaction and permeability variations at stylolites. Stylolites are rough dissolution seams that develop in sedimentary basins during chemical compaction. In the Zechstein 2 carbonate units, an important lean gas reservoir in the southern Permian Zechstein basin in Germany, stylolites influence local fluid flow, mineral replacement reactions and hence the permeability of the reservoir. Our simulations demonstrate that layer-dominated stylolites can grow in three distinct stages: an initial slow nucleation phase, a fast layer-pinning phase and a final freezing phase if the layer is completely dissolved during growth. Dissolution of the pinning layer and thus destruction of the stylolite's compaction tracking capabilities is a function of the background noise in the rock and the dissolution rate of the layer itself. Low background noise needs a slower dissolving layer for pinning to be successful but produces flatter teeth than higher background noise. We present an advanced classification based on our simulations and separate stylolites into four classes: (1) rectangular layer type, (2) seismogram pinning type, (3) suture/sharp peak type and (4) simple wave-like type. Rectangular layer type stylolites are the most appropriate for chemical compaction estimates because they grow linearly and record most of the actual compaction (up to 40 mm in the Zechstein example). Seismogram pinning type stylolites also provide good tracking capabilities, with the largest teeth tracking most of the compaction. Suture/sharp peak type stylolites grow in a non-linear fashion and thus do not record most of the actual compaction. However, when a non-linear growth law is used, the compaction estimates are similar to those making use of the rect
AU  - Koehn,D
AU  - Rood,MP
AU  - Beaudoin,N
AU  - Chung,P
AU  - Bons,PD
AU  - Gomez-Rivas,E
DO  - 10.1016/j.sedgeo.2016.10.007
EP  - 71
PY  - 2016///
SN  - 0037-0738
SP  - 60
TI  - A new stylolite classification scheme to estimate compaction and local permeability variations
T2  - Sedimentary Geology
UR  - http://dx.doi.org/10.1016/j.sedgeo.2016.10.007
UR  - http://hdl.handle.net/10044/1/56120
VL  - 346
ER  -
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