Data Publication

Data and software used in: “Non-Hertzian stress fields in simulated sandstone grains and implications for compactive brittle failure - a high-resolution FEM approach”

Takahiro Shinohara

Utrecht University

(2024)

Descriptions

Globally, sandstone formations are typically targeted for hydrocarbon extraction. However, these activities often lead to surface subsidence or even induced seismicity. The cause lies in reservoir compaction driven by pore pressure depletion and the associated increase in effective overburden stress. Such compaction is partly elastic, but can additionally be caused by instantaneous plastic and rate/time-dependent processes, such as subcritical crack growth. Compaction due to grain breakage, either via critical or subcritical crack growth, is driven by tensile stresses acting on surface and volume flaws. Therefore, we performed high-resolution 3D linear elastic FEM simulations on simplified grain assemblies to investigate the effect of stress-strain boundary conditions, porosity and mineralogical variations on grain-scale stress fields. We found that compactive failure of sandstone due to grain breakage is related to the probability of pre-existing surface flaws with size up to 30 μm falling in a pore surface region with sufficiently high tensile stress where the Griffith criterion is satisfied. Using the tensile stress distribution observed in the 3D FEM simulations, a preliminary, time-independent failure probability model was developed, which qualitatively predicts a non-linear increase in grain cracking during deviatoric loading. The detailed findings of our work are found in the corresponding paper. The data presented here are the input geometry and output (results) for the 3D FEM simulations, an in-house python code for 2D FEM simulations performed to obtain polynomial functions employed to describe appropriate boundary conditions for some of the 3D simulations, the input geometry and output (results) for the 2D FEM simulations and a MATLAB script for the failure probability model.

Keywords

Originally assigned keywords

Rock and melt physical properties

grain scale stress field

crack growth

porous sandstone compaction

local porosity variation

probability-type sandstone failure model

Finite Element Modelling

sedimentary rock -> sandstone

deformation testing

elasticity

strain

vacuum

bulk sample deformation behavior

microphysical deformation mechanism -> intragranular cracking

Corresponding MSL vocabulary keywords

deformation testing

elasticity

strain

vacuum

MSL enriched keywords

Apparatus

deformation testing

Measured property

elasticity

Measured property

elasticity

strain

vacuum

sedimentary rock

sandstone

pore fluid pressure

coupled mechanical-chemical effects

rate of crack growth

porosity

Inferred deformation behavior

microphysical deformation mechanism

intragranular cracking

time-dependent mechanism

sub-critical crack growth

porosity

Analyzed feature

deformation microstructure

brittle microstructure

intragranular crack

induced seismicity

surface subsidence

MSL enriched sub domains i

rock and melt physics

analogue modelling of geologic processes

microscopy and tomography

Source

https://public.yoda.uu.nl/geo/UU01/1YQPU8.html

Source publisher

Utrecht University

DOI

10.24416/uu01-1yqpu8

Creators

Takahiro Shinohara

Utrecht University

Contributors

Thieulot, Cedric

Supervisor

Utrecht University

Spiers, Christopher

Supervisor

Utrecht University

Hangx, Suzanne

Supervisor

Utrecht University

Citation

Shinohara, T. (2024). Data and software used in: “Non-Hertzian stress fields in simulated sandstone grains and implications for compactive brittle failure - a high-resolution FEM approach” (Version 1.0). Utrecht University. https://doi.org/10.24416/UU01-1YQPU8

Dates

Updated:

2024-09-12T13:24:10

Collected:

2020-07-01/2023-12-31

Language

en

Funding References

Funder name: NWO

Rights

Open - freely retrievable

Creative Commons Attribution 4.0 International Public License

Datacite version

Version 1.0