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Open-File Report 2014–1080

The work described in this report was performed in cooperation with the U.S. Department of Energy and the U.S. Bureau of Ocean Energy Management.

Cruise Report for P1–13–LA, U.S. Geological Survey Gas Hydrates Research Cruise, R/V Pelican April 18 to May 3, 2013, Deepwater Gulf of Mexico

By Seth S. Haines, Patrick E. Hart, Carolyn D. Ruppel, Thomas O’Brien, Wayne Baldwin, Jenny White, Eric Moore, Pete Dal Ferro, and Peter Lemmond

Thumbnail of and link to report PDF (12.8 MB)Abstract

The U.S. Geological Survey led a seismic acquisition cruise in the Gulf of Mexico from April 18 to May 3, 2013, with the objectives of (1) achieving improved imaging and characterization at two established gas hydrate study sites, and (2) refining geophysical methods for gas hydrate characterization in other locations. We conducted this acquisition aboard the R/V Pelican, and used a pair of 105/105-cubic-inch generator/injector air guns to provide seismic energy that we recorded using a 450-meter 72-channel digital hydrophone streamer and 25 multicomponent ocean-bottom seismometers.

In the area of lease block Green Canyon 955, we deployed 21 ocean-bottom seismometers and acquired approximately 400 kilometers of high-resolution two-dimensional streamer seismic data in a grid with line spacing as small as 50 meters and along radial lines that provide source offsets up to 10 kilometers and diverse azimuths for the ocean-bottom seismometers. In the area of lease block Walker Ridge 313, we deployed 25 ocean-bottom seismometers and acquired approximately 450 kilometers of streamer seismic data in a grid pattern with line spacing as small as 250 meters and along radial lines that provide source offsets up to 10 kilometers for the ocean-bottom seismometers. The data acquisition effort was conducted safely and met the scientific objectives.

First posted May 16, 2014

For additional information contact:
Director, Central Energy Resources Science Center
U.S. Geological Survey
Box 25046, MS-939
Denver Federal Center
Denver, CO 80225–0046
http://energy.usgs.gov/

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Suggested citation:

Haines, S.S., Hart, P.E., Ruppel, C.D., O’Brien, Thomas, Baldwin, Wayne, White, Jenny, Moore, Eric, Dal Ferro, Pete, and Lemmond, Peter, 2014, Cruise report for P1–13–LA, U.S. Geological Survey gas hydrates research cruise, R/V Pelican April 18 to May 3, 2013, deepwater Gulf of Mexico: U.S. Geological Survey Open-File Report 2014–1080, 33 p., https://dx.doi.org/10.3133/ofr20141080.

ISSN 2331-1258 (online)



Contents

Abstract

Introduction

Cruise Objectives, Strategy, and Planning

Cruise Operations

Environmental Compliance

Cruise Data Overview

Summary

Acknowledgments

References Cited

Appendix 1. Shipboard Personnel

Appendix 2. Seismic Transects Summary


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