A14_20240105_140G0224R00004a_RFI-SS_Attch_Draft_Existing_Seismic_Data_Specifications_1.docx

Minimum Specifications

USGS – Central Energy Resources Science Center Reflection Seismic Data Acquisition

STATEMENT OF NEED

The Central Energy Resources Science Center conducts geologic investigations into the geologic framework and energy potential in various areas of the continental United States, including Alaska. Projects carried out as part of this Program rely heavily on subsurface information that is supplied mainly through the use of well log and multichannel reflection seismic data. These data sources are used to determine geologic structure, stratigraphic relationships, tectonics, and geologic history as it relates to the assessment of energy resources in sedimentary basins of the nation. To this end, the USGS currently requires seismic data brokers to furnish and deliver two dimensional (2-D) multichannel seismic reflection data.

SPECIFICATIONS

The 2-D seismic reflection data must have been acquired from and processed using the following minimum standards:

A.1. DESCRIPTION OF DATA

The contractor shall provide the USGS access to its data library of 2-D multichannel seismic reflection data.

A.2. DATA RIGHTS

The contractor certifies that all data provided under this contract are the property of the contractor, and said data is not subject to undisclosed restrictions on its reproduction or distribution. The contractor also agrees to grant the USGS limited rights to the data it purchases in that the USGS may use the data internally but not publish the digital data without express written permission from the contractor. However, the USGS would request that it be allowed to publish images of selected seismic lines provided that all reference to the exact location of the data on both the seismic sections and the locations maps are removed. The USGS shall have complete unrestricted rights to publish derivative products which have been produced using the data without prior permission from the contractor.

B.1. LICENSED DATA – MANDATORY DELIVERABLES

a. Digital copy of final processed data in either .jpg, .tiff, or .pdf format

b. Vertical Scale: Not less than 2.5 inches per second

c. Polarity: Normal or Reversed (as specified on the hardcopy plot of the data).

d. The USGS will be supplied with digital copies of the 2-D data it licenses as well as digital or paper copies of all appropriate shot point maps and digital SEGP1 or UKOOA format location files for all appropriate shot points as part of the licenses to the data.

B.2. MINIMUM ACQUISITION PARAMETERS

a. Energy Source: Dynamite, Vibroseis and/or Primacord

b. Record Length: 2 seconds or more.

c. Sample Rate: .5 milliseconds or more, but not more than 4 milliseconds

d. Number of Recording Channels: 24 or more

e. Stack Fold: 6 or more

f. Must have been recorded digitally (not with an analog recording system)

B.3. MINIMUM PROCESSING PARAMETERS

The data must have been processed within 18 months of original acquisition using industry standard techniques at the time of processing. Processing after the demultiplexing of field data will include at a minimum, gain correction(s), pre-stack deconvolution, at least one pass of velocity analysis, residual statics corrections, normal moveout correction, and CMP stacking. If the data has been re-processed at a later date the USGS requests the data using the most recent version of the processing available to the vendor.

B.4. OPTIONAL DELIVERABLES

a. The USGS may purchase the final processed version of the data in digital SEG-Y format on CD-ROM, or DVD for the data it licenses at a cost for reproduction only.

b. The USGS may purchase the raw, unprocessed field version of the data in either demultiplexed digital SEG-Y format or the original SEG field recording format on CD-ROM, or DVD for the data it licenses at a cost for reproduction only.

c. The costs will include digital copies of the observers and surveyors notes for the data the USGS licenses.