Ensemble RFT Plot

ResInsight allows the user to create a ensemble RFT plot similar to summary ensemble plots. The functionality also computes statistics, e.g. P10, P90, and mean. When possible, ResInsight avoids loading the grid when reading ensemble RFT data.

An ensemble RFT plot can also be used as the basis for an RFT Correlation Plot, which relates the RFT pressure response to the ensemble parameters.

Create New Ensemble RFT Plot

When a summary ensemble has been imported, observed FMU data can be imported via right-clicking Observed Data in the Plot Project Tree, and selecting Import Observed FMU Data.

To create ensemble RFT plot, right-click RFT Plots and select New RFT Plot.

Property Editor

The property editor lets the user select which curves to display in the RFT plot.

Well Name

Select the well to display in the plot. Wells postfixed by ’(Well Path)’ have an associated well trajectory loaded.

Sources

Subsequent to selecting a well in the Well Name field, the relevant sources for that well will appear in the Sources field. The sources for this particular case are:

  • Ensembles with RFT Data – List of ensembles which contain RFT data with check-boxes to activate display.
  • Observed FMU data – Observed data imported from a FMU run.

When the user selects one or more sources, a selection of their time steps appears in the Time Steps field.

Time Steps

The Time Steps field contains the relevant time steps according to the source selection. Time steps are deemed to be relevant by the following rules:

  1. If a single source or sources of the same type are selected, all available time steps in those sources are shown.
  2. If sources from two or tree types are selected, the time steps are filtered:
  • The time steps matching the observed case(s) time steps.
  • If no time steps from a case match the observed time step, the two adjacent ones are shown.
  • The first time step from any grid case(s) (as initial pressure reference). If the Observed data isn’t selected, the RFT data serves as filter reference.

Each time step is postfixed by letter(s) to indicate source type(s) of each time step. The source types are indicated in square brackets:

  • O – Time step has Observed data
  • E – Time step has Ensemble data
  • R – Time step has RFT data
  • G – Time step has Grid data

More than one letter for one single time step, means that the time step comes from multiple case types.

Zonation/Formation Names

The display of formations lines is controlled in the same manner as for RFT plots. Please see the full documentation of the formations property editor for details about formations.

Legend and Axis

Visual properties of legend and axes is controlled in the same manner as for RFT plots.

Color by Ensemble Parameter

One ensemble parameter is selected to control coloring. The ensemble parameter value for each case is used to pick a color in a color range. In this case a color legend appears.

Import of Observed Ensemble RFT data from FMU

Observed RFT data as part of a FMU run is presupposed to be located in a folder which contains the following four file types:

  • layer_zone_table.txt
  • <well_name>.obs
  • <well_name>.txt
  • well_date_rft.txt

The purpose and format of the data files is explained below.

Note

The data file well_date_rft.txt is required. If missing, no Observed FMU data will be imported.

Correlation of grid and formations

The file layer_zone_table.txt can be used to correlate each grid k-layer with a formation name. This file is identical for all cases in the same ensemble.

Example file layer_zone_table.txt:

1   UpperReek
2   UpperReek
3   UpperReek
4   UpperReek
5   UpperReek
6   MidReek
7   MidReek
8   MidReek
9   MidReek
10  MidReek
11  LowerReek
12  LowerReek
13  LowerReek
14  LowerReek

Observed pressure and error

For a given well name, the file <well_name>.obs is a data file containing two columns to specify observed pressure and error. Column one contains observed pressure and column two contains error. The observation data is valid for one and only one layer/formation.

Example file for well OP_1, i.e. OP_1.obs:

303.000   3.000
304.000   3.000
305.000   3.000

Observed pressure and error - multiple observations for a well

If there are multiple observations for a well at different dates, the naming of the files include a measurement ID

Example file well_date_rft.txt:

R_A2 2018-03-01 1
R_A2 2019-03-01 2

Measurement ID is the last column. The corresponding observations files are named as follows, the measurement ID is appended to the well name.

R_A2_1.obs
R_A2_1.txt
R_A2_2.obs
R_A2_2.txt

Reservoir zone name

For a given well name, the file <well_name>.txt is a data file containing five columns that specify its correlation with reservoir zones. Each line of data must contain:

  • Utmx: x-coordinate in UTM
  • Utmy: y-coordinate in UTM
  • Measured Depth relative to the Kelly Bushing (MDRKB)
  • True Vertical Depth referenced to Mean Sea Level (TVDMSL)
  • Reservoir zone name

Example file for well OP_1, i.e. OP_1.txt:

461288.719   5933415.000   1816.200   1611.692   UpperReek
461288.685   5933415.027   1824.560   1620.052   MidReek
461288.683   5933415.029   1840.000   1635.492   LowerReek

Well measurements - date format 1

The data file well_date_rft.txt contains well measurements. The file contains four columns for each well measurement:

  • Well Name
  • Date in two digit form <DD>
  • Month in two digit form <MM>
  • Year in four digit form <YYYY>
  • Measurement index

There can be multiple measurement for each well.

Example file well_date_rft.txt:

OP_1   01 02 2000   1
OP_2   01 02 2000   1
OP_4   01 01 2001   1
WI_1   01 02 2000   1
WI_3   01 03 2001   1

Well measurements - date format 2

The data file well_date_rft.txt contains well measurements. The file contains four columns for each well measurement:

  • Well Name
  • Date on the format <YYYY-MM-DD>
  • Measurement index

There can be multiple measurement for each well.

Example file well_date_rft.txt:

R_A2 2018-03-01 1
R_A2 2019-03-01 2
R_A6 2018-11-07 1
R_A6 2018-11-07 2
R_A6 2018-11-07 3