Seismic Prospecting for Gas-hydrate and Associated Free-gas Prospects in the Milne Point Area of Northern Alaska
T. L. Inks, M. W. Lee, W. F. Agena, D. J. Taylor, T. S. Collett, M. V. Zyrianova, R. B. Hunter, 2009. "Seismic Prospecting for Gas-hydrate and Associated Free-gas Prospects in the Milne Point Area of Northern Alaska", Natural Gas Hydrates—Energy Resource Potential and Associated Geologic Hazards, T. Collett, A. Johnson, C. Knapp, R. Boswell
Download citation file:
In 1995, the U.S. Geological Survey conducted the first systematic assessment of the in-place natural-gas-hydrate resources of the United States. That study suggested that the permafrost-associated gas hydrates on the Alaska North Slope may contain as much as 590 tcf (16.7 tcm) of in-place gas. However, the Alaska North Slope gas-hydrate assessment failed to identify or characterize the nature of individual gas-hydrate accumulations or prospects.
Detailed analysis and interpretation of available two-dimensional (2-D) and three-dimensional (3-D) seismic data, along with seismic modeling and correlation with specially processed downhole well-log data, have lead to the development of a viable method for identifying subpermafrost gas hydrate prospects within the gas-hydrate stability zone (GHSZ) and associated sub-gas-hydrate free-gas prospects in the Milne Point area of northern Alaska. This study has revealed a total of 14 gas-hydrate prospects in the Milne Point area. The seismic data, in conjunction with geophysical modeling results from a related study, was also used to further characterize the thickness and concentration of gas-hydrate occurrences within the delineated prospects. A Monte-Carlo-style statistical analysis of the seismic and well-log-derived reservoir data indicates that the gas-hydrate prospects in the Milne Point area may hold about 668.2 (18.9 bcm) bcf of gas.
Figures & Tables
In September 2004, the American Association of Petroleum Geologists (AAPG) convened a Hedberg Research Conference in Vancouver, British Columbia, Canada titled "Natural Gas Hydrates: Energy Resource Potential and Associated Geologic Hazards." As a continuation of the Hedberg Research Conference in Vancouver, the conveners of the conference and the editors of this Memoir have worked with more than 150 authors and coauthors to prepare this Memoir on gas hydrates. This publication follows the goals of the Hedberg conference; however, the contents of this Memoir were expanded to include all aspects of gas hydrates in nature. This Memoir contains 39 individual contributions, ranging from long topical summaries to shorter focused research papers. This Memoir has been published in two parts, with digital versions of all the complete research papers included on the enclosed CD. The hardcopy portion of the Memoir includes abstracts and several key figures for each of the contributions along with a complete copy of a gas hydrate technical review. The digital portion of this Memoir has been organized into a series of topical sections consisting of review articles, marine gas hydrate papers, and gas hydrate laboratory and modeling studies. Because of the rapidly emerging worldwide interest in gas hydrates, this comprehensive treatise on the geology of gas hydrates will be valuable to both the gas hydrate research community and exploration/development geologists working in arctic and deep marine environments.