12.6.19 LogChannelMetadata

ChannelClass

PropertyKind

A mandatory value categorizing a log channel. The classification system used in WITSML is the one from the PWLS group.

NOTE: This should turn into an extensible enumeration before WITSML is released.

ChannelState

ChannelState

Defines where the channel gets its data from, e.g., calculated from another source, or from archive, or raw real-time, etc.

Derivation

ChannelDerivation

Indicates that the channel is derived from one or more other channels

EndIndex

AbstractIndexValue

When the log header defines the direction as "Increasing", the endIndex is the ending (maximum) index value at which the last non-null data point is located. When the log header defines the direction as Decreasing, the endIndex is the ending (minimum) index value at which the last non-null data point is located.

LoggingCompanyCode

String64

The RP66 organization code assigned to a logging company. The list is available at http://www.energistics.org/geosciences/geology-standards/rp66-organization-codes

LoggingCompanyName

String64

Name of the logging company.

LoggingMethod

LoggingMethod

Defines where the log channel gets its data from: LWD, MWD, wireline; or whether it is computed, etc.

NominalHoleSize

LengthMeasureExt

The nominal hole size at the time the measurement tool was in the hole. The size is "nominal" to indicate that this is not the result of a caliper reading or other direct measurement of the hoe size, but is just a name used to refer to the diameter. This is normally the bit size.

In a case where there are more than one diameter hole being drilled at the same time (like where a reamer is behind the bit) this diameter is the one which was seen by the sensor which produced a particular log channel.

PassNumber

String64

The nominal pass number for the channel. No precise meaning is declared for this attribute but it is so commonly used that it must be included.

The value here should match a wireline pass number for logging data.

RunNumber

String64

The nominal run number for the channel. No precise meaning is declared for this attribute but it is so commonly used that it must be included.

The value here should match a bit run number for LWD data and a wireline run number for logging data.

StartIndex

AbstractIndexValue

When the log header defines the direction as "Increasing", the startIndex is the starting (minimum) index value at which the first non-null data point is located. When the log header defines the direction as "Decreasing", the startIndex is the starting (maximum) index value at which the first non-null data point is located.

TimeDepth

String64

Is this a time or depth log?

ToolClass

String64

A value categorizing a logging tool. The classification system used in WITSML is the one from the PWLS group.

NOTE: This should turn into an extensible enumeration before WITSML is released

ToolName

String64

Name of the logging tool as given by the logging contractor.

From: Channel.LogChannelMetadata

1To: LogChannelMetadata

Association