Parameter overview

MigriX contains a very limited set of input parameters, which are found in the Properties/Input section in the Project Workspace.

Most parameters of these can be specified either as constant values or as grids. There are three different categories:

Project parameter - Global model parameters which are not tied to a specific layer.
Layer parameters - Parameters that are specified for each layer and are static through time
History parameters - Parameters that represent a time history. The intervals correspond to the layer ages in the model.

Name

Branch

Type

Description

Unit

Contents

Project.studyname

Project

Set the studyname of the project (e.g. a geographic area or topic). Project files will be stored in a subfolder with this name

(e.g. /migri/mystudyname/myproject.mirp)

Text

Project.description

Project

General description of the project in free text

Text

Project.comment

Project

Comments on the project case in free text

Text

Project.basin

Project

Name of the basin where the geomodel is located

Text

Project.median

Project

Central meridian of project UTM zone.

Value

Project.area

Project

Grid that defines the area and resolution of the geometries created by MigriX. Use to crop a large regional model to a small area.

Grid

Horizon

Geomodel

Layer

Depth grid, negative values below MSL.

Grid

Age

Geomodel

Layer

Age [Ma] at top of layer

Value

Name

Geomodel

Layer

Name of layer

Text

Netgross.adjust

Geomodel

Layer

Net/gross scaling factor used in trap volumetric capacity calculations.

Grid or value

Faults

Geomodel

Layer

A file with closed polygons around each fault cutting the layer.

CSV or polygon file

Faults.inside

Geomodel

A file with control points to assist in building faulted geometries (UserData value of 1 for inside and 0 for outside of faults).

CSV file

Layertype

Geomodel

Layer

Basic type of layer (reservoir, seal, overburden)

Text

Lithology

Lithologies

Layer

Main lithology of Layer, 16 predefined types

1-16

Vsh

Lithologies

Layer

Fraction of shale in Layer – vertical average over entire Layer.

	First priority when Vsh + Vca + Vcp +Vev + Vss > 1.

Fraction

Grid or value

Vca

Lithologies

Layer

Fraction of low-permeable carbonate in Layer. Second priority.

Fraction

Grid or value

Vcp

Lithologies

Layer

Fraction of permeable carbonate in Layer. Third priority.

Fraction

Grid or value

Vev

Lithologies

Layer

Fraction of evaporite in Layer

Fraction

Grid or value

LithoFacies

Lithologies

Layer

LithoFacies ID in layer

Grid or value

Eroded

Histories

History

Amount of eroded sequence at the Time of Deposition of the Layer (TDL)

Grid or value

Sedimentsurface

Histories

History

Depth to seabed (negative) or height above seabed (positive) of the uppermost layer at TDL.

Grid or value

Temperature.surface

Histories

History

Temperature of sedimentsurface at TDL

°C

Grid or value

Temperature.

gradient

Histories

History

Average temperature gradient at TDL

°C/km

Grid or value

Temperature.

compaction

Histories

History

Reduction in temperature gradient with depth.

	T = Temperature.surface + Temperature.gradientz - Temperature.compactionz²

°C/km²

Grid or value

OverpressureHistory

Histories

Layer

History of overpressure for the layer

MPa

Grid or value

Overpressure.

fraction

Histories

Layer

Fraction of present day overpressure used at time of deposition of layer.

	Overpressures = Overpressure.fraction * OverpressureHistory.

Fraction

Grid or value

FaultsealEvent

Histories/

Events

History

Activate layer fault seal event

Fraction

Grid or value

Source.active

Source

Layer

On/off switch for source rocks (0=off, 1=on)

0 or 1

Source.gas

Source

Layer

Use Exp.0 for MigriX generation model or specify a value representing volumes per timestep.

kg/m³

Grid or value

Source.oil

Source

Layer

Use Exp.0 for MigriX generation model or specify a value representing volumes per timestep.

kg/m³

Grid or value

Source.thickness

Source

Layer

Thickness of source rock unit

Grid or value

Source.TOC

Source/

SourcePotential

Layer

Average initial total organic carbon content of source rock layer

wt%

Grid or value

Source.HI

Source/

SourcePotential

Layer

Average initial hydrogen index of source rock layer

mg HC/g TOC]

Grid or value

Source.kinetics

Source/

SourcePotential

Layer

Select a kinetic scheme from the kinetics library.

Selection

Expel.

liquidFraction

Source/

SourcePotential

Layer

Fraction of kerogen breaking down to liquid petroleum. Only used when modelling 2 component (oil/gas) kinetics. When using multicomponent kinetics, the fractions are taken from the kinetics table.

Fraction

Grid or value

Gas.retain

Source/

SourcePotential

Layer

Volume of generated gas retained in source

Sm³/m³

Grid or value

Oil.retain

Source/

SourcePotential

Layer

Volume of generated oil retained in source

mSm3/m3

Grid or value

K.adjust

Layer Hydraulic

Layer

Permeability scaling factor. Default = 1

Grid or value

Pe.add

Layer Hydraulic

Layer

Entry pressure (MPa_Hg) that is added to the entry pressure function. Use to increase sealing potential of layer

MPa

Grid or value

Project.retention

Layer Hydraulic

Layer

Defines if HC retention during migration should be modelled (1) or not (0)

0 or 1

Project.faultseal

Fault Hydraulic

Project

Project fault seal method applied to layers which have Faultseal.method set to 9.

Grid or value

Faultseal.method

Fault Hydraulic

Layer

Fault seal method used for layer.

Options are 0 (open) 1(entry pressure) 2 (geometric), 8 (closed) and 9 (use Project.faultseal).

Grid or value

Faultseal.adjust

Fault Hydraulic

Layer

Scale entry pressures in fault zones by this value [fraction]

fraction

Grid or value

Faultseal.add

Fault Hydraulic/

Geometric Seal

Layer

Entry pressure [MPa] added to the fault zones

MPa

Grid or value

Faultseal.

throwseal

Fault Hydraulic/

Geometric Seal

Layer

Minimum throw required to start sealing the fault

Grid or value

Faultseal.

throwslope

Fault Hydraulic/

Geometric Seal

Layer

Increase in entry pressure for each m increase in throw

MPa/m

Grid or value

Faultseal.

throwoff

Fault Hydraulic/

Geometric Seal

Layer

Fraction of thickness used in calculating seal

fraction

Grid or value

	The functionality below requires the MigriXplore license feature

Name

Branch

Type

Description

Contents

Project.processes

Project

Defines which processes should be simulated. By default, all processes will be simulated.

1: Generation only. 2: Generation and Migration.

Integer

Project.sampling

Project

Resampling resolution of the geometry (relative to the seabed depth grid or Project.area grid)

Integer

Project.output

Project

Semicolon-separated list of tags specifying the active output storing options.

	Checked against tags specified in the output table. Set to "No tags" to process outputs with no tags. Set value to an unknown tag name (e.g. "No" ) to skip output processing

Text

Project.welltops

Observations

Project

File with observed well tops

csv file

Project.overpressures

Observations

Project

File with observed overpressures to be used to calibrate model

csv file

Project.temperatures

Observations

Project

File with observed temperatures to be used to calibrate model

csv file

Project.maturities

Observations

Project

File with observed temperatures to be used to calibrate model

csv file

Project.hydrocarbons

Observations

Project

File with observed hydrocarbon columns to be used to calibrate model

csv file

Project.rockeval

Observations

Project

File with Rock-Eval data from wells

csv file

Project.bulkpvt

Observations

Project

File with bulk PVT observation data

csv file

Project.growobs

Observations

Project

The observation data points can be extended away from the well when mapping onto layers. Using a value of 5 will plot the values in the 5 nearest mesh points.

Integer