Markus Peltz

Markus Peltz
University of Greifswald · Department of Geology

Master of Science

About

13
Publications
3,175
Reads
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67
Citations
Citations since 2016
11 Research Items
67 Citations
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Introduction
I am studying textural and structural properties of illite in sandstones by various direct in indirect methods. Also I am interessted in studying the dissolution of individual clay particles under varying chemical conditions.
Education
April 2012 - May 2015
University of Greifswald
Field of study
  • Geoscience and Environment
October 2008 - March 2012
University of Greifswald
Field of study
  • Geology

Publications

Publications (13)
Article
Full-text available
Diagenetic illite growth in porous sandstones leads to significant modifications of the initial pore system which result in tight reservoirs. Understanding and quantifying these changes provides insight into the porosity-permeability history of the reservoir and improves predictions on petrophysical behavior. To characterize the various stages of d...
Article
Full-text available
Computer X-ray microtomography (µXCT) represents a powerful tool for investigating the physical properties of porous rocks. While calculated porosities determined by this method typically match experimental measurements, computed permeabilities are often overestimated by more than 1 order of magnitude. This effect increases towards smaller pore siz...
Article
Full-text available
Bentonite is currently proposed as a potential backfill material for sealing high-level radioactive waste in underground repositories due to its low hydraulic conductivity, self-sealing ability and high adsorption capability. However, saline pore waters, high temperatures and the influence of microbes may cause mineralogical changes and affect the...
Article
There is a current need to develop buoyant and biocompatible nanoclays for removing oil pollution from the surface waters of rivers, lakes and oceans. Application of clay-based amendments should either aid dispersion, adsorption or biodegradation of hydrocarbons without introducing additional toxicity. Ultrathin (< 15 μm thick) nanoclay films of lo...
Preprint
Full-text available
Computer microtomography (µXCT) represents a powerful tool for investigating the physical properties of porous rocks. While calculated porosities determined by this method typically match experimental measurements, computed permeabilities are often overestimated by more than one order of magnitude. This effect increases towards smaller pore sizes,...
Article
Carbonated hydroxy-apatite (Ca10-b(NH4,K,Na)2b(PO4)6-y[(CO3)2x+(3/2)y(OH)2–2x]; CHAP) was synthesized in batch-type experiments by mixing of calcium (Ca)- and phosphate-bearing aqueous solutions and the transformation of calcite powder in aqueous solution between 11° and 65 °C. Compositional changes of the mother solution and solid phase products w...
Poster
Full-text available
Heterogeneity of geological materials poses various problems when evaluating reservoir quality and storage potential. We analysed samples of different sedimentary facies of a Rotliegend sandstone from the Flechtingen High (Northern Germany) to determine the influence of depositional environment and diagenetic history on mineralogical composition an...
Article
Full-text available
The goal of this study is to better understand the porosity and permeability in shales to improve modelling fluid and gas flow related to shale diagenesis. Two samples (WIC and HAD) were investigated, both mid-Jurassic organic-rich Posidonia shales from Hils area, central Germany of different maturity (WIC R0 0.53 % and HAD R0 1.45 %). The method f...
Conference Paper
Full-text available
The integrity of the caprock plays a major role for the long-term safety of CCS projects. Salt-induced anticline structures in NE Germany that are capped by Toarcian claystones could store up to 1,5 Gt CO2. This study focused on the interaction between Lower Jurassic claystones and CO2-charged brine in an attempt to identify pathways within the cap...
Conference Paper
MX80 bentonite, composed mainly of Na-montmorillonite, is one of the prime candidates as a buffer for the Swedish spent fuel repository in Forsmark. In the repository the buffer is expected to come into contact with groundwater from surrounding rock and with cement-altered solutions derived from areas that use concrete. This study aimed to characte...

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Projects

Project (1)
Project
Quantitative predictability of chemical reactions and their kinetics in reservoir rocks is the focus of the ResKin project. This task requires a mechanistic understanding of the reaction kinetics over a large range of the length scale. More specifically, this includes the coupled dissolution-precipitation kinetics and related chemical heterogeneities on the crystal surface (nm scale), in pore structures (mm scale), and up to the core plug (cm scale). Until now, the predictive capabilities of the reaction kinetics in such complex systems are very limited because of the observed intrinsic variability of reaction rates. Here we suggest a combined approach including experimental and analytical efforts as well as computational techniques ranging from kinetic Monte Carlo simulations to reactive transport modelling (RTM). We provide new results on surface reactivity under reservoir conditions with well-defined diagenetic constraints. We combine such results with data about the hydrodynamics of reacting fluids and utilize the resulting information for the calibration of new RTM codes. We expect a broad range of applications of such novel kinetically-based RTM algorithms. ResKin is a joint project of several universities and research institutes, including U Bremen, U Greifswald, ITWM Kaiserslautern, KIT Karlsruhe, U Mainz, and HZDR Dresden/ Leipzig.