Save results

Main results - saturated properties

The default is to save results to disk, mostly in .roff format. The main results from fmu-pem are also saved in .grdecl format, as this is required by seismic_forward, where they are used. Table 1 lists the different grids that are saved.

Grid	Type	Example name	Comment
Density	Saturated rock properties	simgrid--density--20180101.roff	One for each simulator date
Vp	Saturated rock properties	simgrid--vp--20180101.roff	One for each simulator date
Vs	Saturated rock properties	simgrid--vs--20180101.roff	One for each simulator date
Vp/Vs	Saturated rock properties	simgrid--vpvs--20180101.roff	One for each simulator date
AI	Saturated rock properties	simgrid--ai--20180101.roff	One for each simulator date
SI	Saturated rock properties	simgrid--si--20180101.roff	One for each simulator date
Vp, Vs and Density	Saturated rock properties	pem--20180101.grdecl	One for each simulator date, three properties within one file

Table 1: List of properties that are saved if save_results_to_disk is set. Note that the .grdecl files are always saved, regardless of the save_results_to_disk option

Intermediate properties

For QC purposes, intermediate results can also be saved. Table 2 lists the different properties that are included in the intermediate properties, which are effective properties for minerals and fluids, dry rock properties, grid showing cells that are below bubble point and modified porosity grid, can also be saved.

Grid	Type	Example name	Comment
Fluid density	Effective fluid properties	simgrid--density_fluid--20180101.roff	One for each simulator date
Fluid bulk modulus	Effective fluid properties	simgrid--bulk_modulus_fluid--20180101.roff	One for each simulator date
Mineral density	Effective mineral properties	simgrid--density_mineral.roff	Static value
Mineral bulk modulus	Effective mineral properties	simgrid--bulk_modulus_mineral.roff	Static value
Mineral shear modulus	Effective mineral properties	simgrid--shear_modulus_mineral.roff	Static value
Pore pressure	Pressure properties	simgrid--pressure--20180101.roff	From the reservoir simulator, one for each date
Overburden pressure	Pressure properties	simgrid--overburden_pressure--20180101.roff	One for each date
Effective pressure	Pressure properties	simgrid--effective_pressure--20180101.roff	One for each date
Dry rock density	Dry rock properties	simgrid--density_dry_rock--20180101.roff	One for each simulator date
Dry rock bulk modulus	Dry rock properties	simgrid--bulk_modulus_dry_rock--20180101.roff	One for each simulator date
Dry rock shear modulus	Dry rock properties	simgrid--shear_modulus_dry_rock--20180101.roff	One for each simulator date
Below bubble point	Binary indicator	simgrid--below_bubble_point--20180101.roff	Grid indicating cells where the formation pressure is below the bubble point
Modified porosity	Porosity	simgrid--adjusted_porosity.roff	When net porosity is adjusted by non-net fraction

Table 2: List of properties that are saved if save_intermediate_results is set.

Difference properties

Difference properties calculated between different simulation dates can be made for saturated rock properties and for convenience, also for input properties from the reservoir simulator. This is controlled by the differences settings in the parameter YAML file:

yaml

# For 4D parameters: settings for which difference parameters to calculate
diff_calculation:
  - attribute: ai
    methods: [diffpercent, ratio]
  - attribute: si
    methods: [diffpercent, ratio]
  - attribute: vpvs
    methods: [ratio]
  - attribute: twtpp
    methods: [diff]
  - attribute: density
    methods: [diffpercent]
  - attribute: vp
    methods: [diffpercent]
  - attribute: vs
    methods: [diffpercent]
  - attribute: swat
    methods: [diff]
  - attribute: sgas
    methods: [diff]
  - attribute: pressure
    methods: [diff]

Three different difference attributes can be calculated: difference, difference percent and ratio. In Table 3, example files of difference properties are shown.

Grid	Type	Example name	Comment
SI ratio	Saturated rock properties	simgrid--siratio--20180701_20180101.roff	One for each difference date
Vp diffpercent	Saturated rock properties	simgrid--vpdiffpercent--20180701_20180101.roff	One for each difference date
TWT PP difference	Two-way travel time	simgrid--twtppdiff--20180701_20180101.roff	One for each difference date

Table 3: List of some of the properties that can be saved if save_results_to_disk and diff_calculation options are set.

Output directories

All .roff files are saved to share/results/grids. The .grdecl files are saved to sim2seis/output/pem. The prefix in the .roff file names is taken from the SIMGRIDNAME in the global configuration file.

yaml

# Settings for saving results
results:
  save_results_to_disk: True
  save_intermediate_results: True

Example: comparison of fluid properties

An example on QC of fluid properties is comparison between effective fluid density as estimated from fmu-pem and from the reservoir simulator. The estimates should be close, as shown in Figure 1.

Figure 1: Estimate of fluid density from simulator model (x-axis) and PEM (y-axis) for a selected time step. With settings for either dry gas, wet gas or a compositional model, simulator model and PEM are in agreement.

Save results ​

Main results - saturated properties ​

Intermediate properties ​

Difference properties ​