FOUR REGIONAL SEISMIC LINES: NATIONAL PETROLEUM RESERVE-ALASKA (SUPPLEMENT TO U. S. Geological Survey Open File Report 00-286), by John J. Miller, Warren F. Agena, Myung W. Lee, Frederick N. Zihlman, John A. Grow, David J. Taylor, Michele Killgore and Harold Oliver

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Identification_Information:

Citation:

Citation_Information:

Originator:: U.S. Geological Survey/Geologic Division/Central Energy Research Team
Publication_Date: 2001
Title:: FOUR REGIONAL SEISMIC LINES: NATIONAL PETROLEUM RESERVE-ALASKA (SUPPLEMENT TO U. S. Geological Survey Open File Report 00-286), by John J. Miller, Warren F. Agena, Myung W. Lee, Frederick N. Zihlman, John A. Grow, David J. Taylor, Michele Killgore and Harold Oliver
Edition: 1
Geospatial_Data_Presentation_Form: Section

Description:

Abstract:

This Internet site contains digital seismic data and associated support data for four regional seismic lines (736 line-miles) recorded in the National Petroleum Reserve - Alaska (NPRA). These lines were created as a supplement to the data set contained on USGS Open File Report 00-286 (Miller et al, 2000) which is a CD-ROM publication that contains stacked, migrated, 2-dimensional seismic reflection data and associated support information for 22 regional seismic lines (3,470 line-miles) recorded in the NPRA from 1974 through 1981. These 22 regional lines, which form a grid covering the entire NPRA, were created by combining various individual lines recorded in different years using different recording parameters. The data were reprocessed by the USGS using modern, post-stack processing techniques, to create a data set suitable for interpretation on interactive seismic computer workstations. Reprocessing was done in support of ongoing petroleum resource studies by the USGS Energy Program. The grid of lines has a nominal spacing of 20 x 20 miles. However there are four intervals where the spacing between lines was much greater than 20 miles. To fill these grid spacing gaps, four additional regional lines (736 line-miles) were created using the same techniques as those used to create the lines on OFR 00-286. These lines and associated support data are contained on this internet site in the following files: 1) Four files containing the digital seismic data in standard, SEG-Y format; 2) One file containing navigation data for these 4 lines and the original 22 lines contained on OFR 00-286, in standard SEG-P1 format; 3) Four small scale graphic images of the four seismic lines in Adobe Acrobat® PDF format; 4) a graphic image of the location map, generated from the navigation file, 5) an ASCII text file with cross-reference information for relating the sequential trace numbers on each regional line to the line number and shotpoint number of the original component lines; and 6) an explanation of the processing used to create the final seismic sections (this document).

The SEG-Y format seismic files and SEG-P1 format navigation file contain all the information necessary for loading the data onto a seismic interpretation workstation.

Purpose:

The data and associated support information contained on this Internet site are the processed data set from 4 regional seismic lines (736 line-miles) recorded in the National Petroleum Reserve - Alaska (NPRA) from 1974 through 1981. The information is a supplement to 22 additional lines contained on the CD-ROM publication OFR 00-286 and are sufficient to allow the user to load the data onto an interactive seismic interpretation workstation and interpret the data.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19740101
Ending_Date: 19811231

Currentness_Reference:

Field data collected between 1974 and 1981 and assumed to be "constant" with time.

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None Planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -162.0638
East_Bounding_Coordinate: -150.9725
North_Bounding_Coordinate: 71.39017
South_Bounding_Coordinate: 68.26841

Keywords:

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: Onshore Geophysics
Theme_Keyword: Seismic Reflection
Theme_Keyword: Geophones
Theme_Keyword: 2-dimensional Seismic Data
Theme_Keyword: Time migration
Theme_Keyword: Deconvolution

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: Alaska
Place_Keyword: National Petroleum Reserve

Access_Constraints: None

Use_Constraints:

Please recognize the U.S. Geological Survey (USGS) as the source of this information. This Internet publication is prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof nor any of their employees makes any warranty, expressed or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Although all data and software published on this Internet site have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Organization: USGS/Geologic Division/Central Region Energy Team
Contact_Person: Miller, John J.

Contact_Position: Geophysicist

Contact_Address:

Address_Type: Mailing and physical address
Address: USGS Energy Team
Address: Bldg. 25, Rm. 2827-F, MS-939, Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Country: USA

Contact_Voice_Telephone: 303-236-5752

Contact_TDD/TTY_Telephone: none

Contact_Facsimile_Telephone: 303-236-8822

Contact_Electronic_Mail_Address: jmiller@usgs.gov

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:: The accuracy of field data conform to digital seismic data recording standards, commercially available between 1974 and 1981. The reprocessed data conform to accuracy in digital seismic data processing techniques and algorithms commonly available in 1999 through 2000.

Logical_Consistency_Report: Not Applicable

Completeness_Report:

Each seismic line processed is through the time migration. These four lines, when combined with the 22 lines contained on OFR 00-286 comprise a complete data set in a nominal 20 x 20 mile grid covering the entire NPRA. Sufficient supporting data are included (survey coordinates, graphic images of the location map and individual seismic lines), to allow the user to load the data onto an interactive seismic interpretation workstation and interpret the data.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:: The latitude and longitude of each shotpoint location was surveyed using a plane-table alidade by the contractor that recorded the data.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:: The elevation of the ground at each shotpoint location was surveyed using a plane-table alidade by the contractor that recorded the data. The data were processed using these elevations, and datum corrections were calculated using an assumed near surface velocity of 10,000 feet per second. Final datum of all seismic lines is sea level. Reflections on the seismic lines tie in both travel-time and waveform at all line intersections.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator:: Geophysical Services, Incorporated (GSI) under contract to the Department of the Navy.
Title: Unpublished
Publication_Date: Unknown

Type_of_Source_Media: 21-track and 9-track magnetic tape

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19740101
Ending_Date: 19811231

Source_Currentness_Reference: Observer log

Source_Citation_Abbreviation: None

Source_Contribution: Seismic data field tapes, Observers' logs, Survey notes

Process_Step:

Process_Description:: Orginal data were recorded on both 21-track and 9-track, magnetic tape in SEG-A and SEG-B multiplexed format. Some segments were processed by the contractor to the point of unmigrated stack. Other segments were processed by the USGS beginning with the field data. Processing steps prior to stacking included editing of noisy data, amplitude scaling, spiking deconvolution, datum statics, Normal Moveout (NMO) corrections, and residual static corrections. After stacking we combined all the line segments comprising each regional line into a single line, converted the trace-to-trace spacing to a constant 110 ft. interval and adjusted the the datum to sea level. We then applied migration, predictive deconvolution, and signature deconvolution.
Process_Date: 1999-2000

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:

Map

Direct_Spatial_Reference: Survey Notes; calculated latitude and longitude for each shotpoint.

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.00001
Longitude_Resolution: 0.00001
Geographic_Coordinate_Units: Decimal degrees

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: Sea Level
Depth_Resolution: 4.0
Depth_Distance_Units: ms
Depth_Encoding_Method: attribute values

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview: Technical Information in word processor format