OPM Flow Keyword Reference

ROCKOPTS

Recognised by the OPM Flow parserPROPS

The ROCKOPTS keyword defines various options with respect to rock compaction and rock compressibility.

Notes:

The keyword is terminated by a “/”.

Records
Fixed number of records
Record count
1
Items per record
4

Parameters

No.NameDescriptionTypeDefault
1METHOD
manual: ROCKOPT1
A defined character string that specifies how the overburden pressures supplied by the OVERBURD keyword are applied to the tabulated pressures in the ROCKTAB keywords: STRESS: Use this option if the overburden pressures on the OVERBURD keyword are greater than the fluid pressure which results in the effective fluid pressure being negative. To avoid the rock compaction tables being entered with negative pressure values use this option. In this case the pore volume and transmissibility multipliers will be tabulated against the effective overburden pressure. PRESSURE: In this case the pore volume and transmissibility multipliers should be tabulated against the effective fluid pressure. This the default value. ROCKOPT1 should be set to PRESSURE if the OVERBURD is not used in the input deck. Only the default value of PRESSURE is supported.STRINGPRESSURE
2REF_PRESSURE
manual: ROCKOPT2
A defined character string that sets the reference pressure option: STORE: Copies the initial calculated grid block pressures into the overburden pressure array, resulting in the pore volumes being referenced at the initial pressures instead of the reference pressures as per the ROCKTAB keyword. NOSTORE: This option results in the pore volumes being referenced as per the ROCKTAB keyword. This is the default value. Note that STORE option should not be used with the OVERBURD keyword as the OVERBURD data will be overwritten.STRINGNOSTORE
3TABLE_TYPE
manual: ROCKOPT3
A defined character string that specifies which region array should be used to allocate the various ROCK and ROCKTAB property tables in the model: ROCKOPT3, should be set to ROCKNUM, SATNUM or PVTNUM. If the parameter is defaulted or the ROCKOPT keyword is not present in the deck, then the PVTNUM array is used. Secondly, if ROCKOPT3 is set to ROCKNUM but the NTROCC parameter on the TABDIMS keyword in the RUNSPEC section is defaulted, then again the PVTNUM array will be utilized. Only the PVTNUM and ROCKNUM options are currently supported.STRINGPVTNUM
4HYST_TYPE
manual: ROCKOPT4
A defined character string that sets the initial conditions for the HYSTER and BOBERG options: DEFLATION: This option defines the reservoir rock to be fully compacted and the deflation curve is used to calculated the initial pore volume and transmissibility multipliers. This is the default value. ELASTIC: This option sets the pore volume and transmissibility multipliers to one, as the reservoir rock is set to lie on the elastic curve. This parameter is ignored by OPM Flow as the ROCKCOMP(ROCKOPT) options of HYSTER and BOBERG are not supported by the simulator.STRINGDEFLATION

Example

--
-- ROCKOPT1 ROCKOPT2 ROCKOPT3 ROCKOPT4
-- PRS/STRE NO/STORE ARRAY
-- -------- -------- -------- --------
ROCKOPTS
PRESSURE NOSTORE PVTNUM / ROCK COMP OPTIONS
The above example defines the default values for the ROCKOPTS keyword.

Manual source: parts/chapters/subsections/8.3/ROCKOPTS.fodt