Velocity_Function


[Columns] [Composed Of] [Referenced By] [Refers To]

General Information

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Name Velocity_Function
Entity Type Abstract
Description A surface location for which there is a velocity function. This may be a borehole for which there is a checkshot or acoustic log, a seismic shotpoint, or CDP or a generic location. The function may be a log, a set of time-depth or time-velocity pairs, or described by an equation.
Submodel Velocity
Entity Scope Project
Primary Key Id
Natural Key
Generalizations Entity , IT_Object , Tracked_Object
Specializations Borehole_Velocity , Checkshot_Survey , Generic_Velocity , Survey_2D_Velocity , Survey_3D_Velocity


Columns

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NameValue DomainProperty /
Storage Unit
DescriptionRequired /
Default
Type
Area_Of_Validity_Id Area
The area in which the velocity function is considered valid. No
NUMBER(38)
Correction_Velocity double Acoustic_Velocity
m/s
The velocity used to correct this function to the datum. No
NUMBER
Datum_Elevation double Length
m
The elevation of the datum to which the velocity - Z pairs are referenced. This may differ from the Seismic Reference Datum. The elevation is relative to the Vertical_Reference of the Velocity_Set No
NUMBER
Existence_Kind REF_EXISTENCE_KIND NA
A reference value that describes the state of existence in the lifecycle of the entity, for example, Planned, Predicted, Required, Simulated, and Actual. Yes
Actual
VARCHAR2(64)
GUID STRING128 NA
Globally Unique IDentifier for an instance of a class. USAGE NOTES: There are two cases: 1) GUID is not populated or used; and 2) it is populated with a value that is globally unique. If the GUID is populated there are two means of doing so for a given project: 2a) Seabed automatically generates and populates the GUID when an instance is created (valid only on Oracle based systems); and 2b) the GUID is generated and populated by an application (other than Seabed) on instance creation. Whether Seabed automatically generates GUIDs for a project is determined by the Auto_GUID flag in SDS_Account. Note that techniques 2a and 2b can coexist in the same project. When GUIDs are automatically generated an application can override the automatically generated GUID with its own GUID by simply supplying the GUID value. Applications that generate their own GUIDs and populate the GUID column will function correctly on projects which have automatic GUID generation turned on. No
VARCHAR2(128)
Id ID No_Unit
Unique identifier for this entity. Yes
NUMBER(38)
Index_Correction double No_Unit
Delta index correction value in the same units as the INDEX channel (time or depth). This value, when added to the INDEX vector values can be used for correction from the function datum to the set datum this correction can be performed even if the Datum_Elevation is null. Times are always two-way acoustic travel times. No
NUMBER
Insert_Date DATE NA
Date the entity was created in the repository No
DATE
Insert_User STRING64 NA
The name of the user responsible for the creation of this entity in the repository. No
VARCHAR2(64)
Name ENTITY_NAME NA
The name given to any object or data item, e.g. name of Well, name of Field, etc. No
VARCHAR2(255)
Original_Source STRING64 NA
The name of the person, Organization or project source that originally provided this entity, e.g. "IHS-EnergyData" or "FinderUpper Stratton Deeper Pool 15" No
VARCHAR2(64)
Produced_By STRING64 NA
The name of application role that created the entity, for data created programmatically. No
VARCHAR2(64)
Remarks STRING2000 NA
Any type of remarks added to an entity instance. No
VARCHAR2(2000)
SDAT_Label int No_Unit
Label used by the security system for entitlements. SDAT is Secure Data Access Technology. No
NUMBER(10)
Source STRING64 NA
Name of the person or organization responsible for this entitys E and P content and quality. Not the data technologist or IT expert creating the entity, for which see IT_Object.Insert_User and Update_User. No
VARCHAR2(64)
Update_Date DATE NA
Date of the most-recent modification to the entity. No
DATE
Update_User STRING64 NA
The name of the user responsible for the last modification to this entity. No
VARCHAR2(64)
Value_Property R_Property
The property of the function value, such as interval velocity or two way time. No
VARCHAR2(64)
Velocity_Set_Id Velocity_Set
The collection of velocities to which this velocity location belongs, if any. No
NUMBER(38)
Velocity_Source R_Velocity_Source
The source of the velocity data. Seismic, Seismic DMO, Seismic Migration, Pseudo Velocity, Sonic Log, Borehole (VSP,checkshot), Computed, and Refraction are the options. No
VARCHAR2(64)
Version STRING255 NA
The form or variant of the entity. Yes
1
VARCHAR2(255)


Refers To

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LinkTo EntityDescriptionImplementation TechniqueRequired
Area_Of_Validity Area The area in which the velocity function is considered valid. Control No
Velocity_Set Velocity_Set The collection of velocities to which this velocity location belongs, if any. Cascade No
Velocity_Source R_Velocity_Source The source of the velocity data. Seismic, Seismic DMO, Seismic Migration, Pseudo Velocity, Sonic Log, Borehole (VSP,checkshot), Computed, and Refraction are the options. Restrict No
Value_Property R_Property The property of the function value, such as interval velocity or two way time. Restrict No


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