| 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 |
| Name | Value Domain | Property / Storage Unit | Description | Required / 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) |
| Link | To Entity | Description | Implementation Technique | Required |
|---|---|---|---|---|
| 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 |