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2009-04-14 16:45:36

Part 9: DLIS Schema Dictionary

Edition 1

1 - Scope

This part lists and describes reference values for attributes belonging to the Digital Log Interchange Standard (DLIS) schema (see Part 8).

2 - Authority

Changes to the DLIS schema dictionary are recommended by the Subcommittee On Recommended Format For Digital Well Data and approved by POSC. Changes may include addition of new terms or removal of obsolete terms. A term removed in one edition may be restored in a later edition only if restored with its previous meaning. A new edition of the DLIS schema dictionary occurs when approved by the Executive Committee and has an edition number obtained by adding 1 to the previous edition number.

3 - Concepts

The tables presented here contain the reference values defined under the DLIS schema for attributes of either the basic schema or the DLIS schema. There is one table per attribute. Each attribute is identified by its label preceded by a the object type to which it belongs and separated by a colon (:). Object types belonging to the basic schema are identified by the prefix `0/' denoting its schema code. Tables are presented alphabetically by object type first and by attribute second.

All DLIS schema reference values use representation code IDENT if written in DLIS schema objects and TIDENT if written in basic schema objects.

4 - CALIBRATION-MEASUREMENT Reference Values

4.1 - PHASE

Currently-defined values correspond to the phase of a calibration measurement.
Table 1 - CALIBRATION-MEASUREMENT:PHASE Reference Values
Reference Value Description
AFTER After survey calibration.
BEFORE Before survey calibration.
MASTER Master calibration.

5 - 0/CHANNEL Reference Values

5.1 - KIND

Currently-defined values correspond to measurements of index channels in and about the borehole.
Table 2 - 0/CHANNEL:KIND Reference Values
Reference Value Description
ANGULAR-DRIFT Channel value represents angular drift.
MEASURED-DEPTH Channel value represents measured depth.
NON-STANDARD Channel value is a non-standard measurement.
RADIAL-DRIFT Channel value represents radial drift.
TIME Channel value represents elapsed time.
VERTICAL-DEPTH Channel value represents vertical depth.
The reference value MEASURED-DEPTH replaces BOREHOLE-DEPTH used in RP66 V1. The change is made to achieve conformance with terminology found in the Petroleum Industry Data Dictionary (PIDD).

5.2 - PROPERTIES

Table 3 - 0/CHANNEL:PROPERTIES Reference Values
Reference Value Description
AUXILIARY Data not normally included has been pro- vided at the specific request of the con- sumer, possibly at some additional cost.
AVERAGED The data is the average of two or more other sources.
CALIBRATED A calibration process has been applied to the data.
CHANGED-INDEX The data has been resampled along an index that is different from its original sam- pling index. For example, data that was originally sampled according to time is res- ampled according to depth, or data origi- nally sampled according to measured depth is resampled according to vertical depth.
COMPUTED The data is the output of a transform, e.g., function former, based on input data from a single tool.
DEAD-TIME-CORRECTED The data has been corrected for dead time.
DEPTH-MATCHED The data has been aligned along its depth index against a reference data source.
DERIVED The data is an output of empirical equa- tions or is the solution of log response equations based on input data from more than one tool.
ENVIRONMENTALLY-CORRECTED All known borehole corrections have been applied to the data.
FILTERED A filtering process has been applied to the data.
HOLE-SIZE-CORRECTED The data has been corrected for hole size effect based on the value of a hole size input.
INCLINOMETRY-CORRECTED The data has been corrected to standard directional references (vertical axis and North axis).
LITHOLOGY-CORRECTED The data has been corrected or computed based on the value of a matrix lithology parameter.
LOCAL-COMPUTATION The data is the result of locally-defined computational expressions. Such data is normally experimental.
LOCALLY-DEFINED The object's name has been created by the operator. This name might not be dictio- nary-controlled and may have no semantic association with the object's data.
MODELLED The data is the output of a theoretical model and is not derived from any mea- sured quantity.
MUD-CORRECTED The data has been corrected for effects of mud.
MUDCAKE-CORRECTED The data has been corrected for mudcake effect.
NORMALIZED The data has been corrected so that its range corresponds to a prescribed norm.
OVER-SAMPLED Interpolated data samples have been added to the original data to align this data with other data.
PATCHED The original data values have been replaced at specific levels. This is normally done to remove spurious values (e.g.,spikes).
PRESSURE-CORRECTED The data has been corrected for hydrostatic pressure (mud weight).
PROPRIETARY Data is proprietary to the producer and is not warranted for use by the consumer.
RE-SAMPLED The data has been resampled along its orig- inal index. For example, the original index values may be wrong. Using a curve-fit, it may be possible to compute new data val- ues that fit the original signal more accu- rately along the original index.
SALINITY-CORRECTED The data has been corrected for salinity effect.
SAMPLED-DOWNWARD The original sampling direction is down- ward.
SAMPLED-UPWARD The original sampling direction is upward.
SPEED-CORRECTED The data has been corrected for variations of the downhole tool speed.
SPLICED The data has been obtained by concatenat- ing two or more other data sources.
SQUARED The data is the result of a squaring process, i.e., a process that converts a smooth func- tion into a step function.
STACKED The data is the sum of two or more other data sources.
STANDARD-DEVIATION The data represents the estimated devia- tion, due to environmental factors or inco- herence of the computational model, of another data source.
STANDOFF-CORRECTED The data has been corrected for standoff effect.
TEMPERATURE-CORRECTED The data has been corrected for tempera- ture effect based on the value of a tempera- ture source.
UNDER-SAMPLED Some of the original data samples have been discarded to reduce the amount of data or to align this data with other data.

6 - 0/COMPUTATION Reference Values

6.1 - PROPERTIES

See Table 3.

7 - EQUIPMENT Reference Values

7.1 - LOCATION

Table 4 - EQUIPMENT:LOCATION Reference Values
Reference Value Description
LOGGING-SYSTEM Equipment is on or in the logging system unit.
REMOTE Equipment is on the surface away from the rig and logging unit system.
RIG Equipment is on the rig.
WELL Equipment is in the borehole.

7.2 - TYPE

Table 5 - EQUIPMENT:TYPE Reference Values
Reference Value Description
ADAPTER Adapter
BOARD Processor board
BOTTOM-NOSE Bottom nose
BRIDLE Bridle
CABLE Cable
CALIBRATOR Calibrator
CARTRIDGE Cartridge
CENTRALIZER Centralizer
CHAMBER Sample chamber
CUSHION Water cushion
DEPTH-DEVICE Depth measuring device
DISPLAY Display
DRAWER Processor drawer
EXCENTRALIZER Excentralizer
EXPLOSIVE-SOURCE Explosive source
FLASK Flask
GEOPHONE Geophone
GUN Gun
HEAD Head
HOUSING Housing
JIG Calibration jig
JOINT Joint
NUCLEAR-DETECTOR Nuclear detector
PACKER Packer
PAD Pad
PANEL Panel
POSITIONING Positioning device
PRESSURE-GAUGE Pressure gauge
PRINTER Printer
RADIOACTIVE-SOURCE Radioactive source
SHIELD Shield
SIMULATOR Simulator
SKID Skid
SONDE Sonde
SPACER Spacer
STANDOFF Standoff
SYSTEM Processor system
TOOL Tool
TOOL-MODULE Tool module
TRANSDUCER Transducer
VIBRATION-SOURCE Vibration source

8 - MESSAGE Reference Values

8.1 - TYPE

Table 6 - MESSAGE:TYPE Reference Values
Reference Value Description
COMMAND Operator command.
RESPONSE Operator response.
SYSTEM System message.

9 - 0/PARAMETER Reference Values

9.1 - PROPERTIES

See Table 3.

10 - 0/ZONE Reference Values

10.1 - DOMAIN

Table 7 - 0/ZONE:DOMAIN Reference Values
Reference Value Description
MEASURED-DEPTH Zone interval is measured depth.
TIME Zone interval is elapsed time.
VERTICAL-DEPTH Zone interval is vertical depth.
The reference value MEASURED-DEPTH replaces BOREHOLE-DEPTH used in RP66 V1. The change is made to achieve conformance with terminology found in the Petroleum Industry Data Dictionary (PIDD).
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