High-frequency near-bottom acoustic reflection signatures of hydrocarbon seeps on the Northern Gulf of Mexico continental slope

被引：0
作者：
Sager W.W. [1 ]
Lee C.S. [1 ,4 ]
Macdonald I.R. [2 ]
Schroeder W.W. [3 ]
机构：
[1] Department of Oceanography, Texas A and M University, College Station
[2] Geochem. and Environ. Research Group, Texas A and M University, College Station
[3] Marine Science Program, University of Alabama, Dauphin Island, AL 36528
[4] Institute of Technology, Samsung Engineering and Construction, Seoul 135-080
来源：
Geo-Marine Letters | 1998年 / 18卷 / 4期
关键词：
Authigenic Carbonate; Hard Bottom; Petroleum Geologist Bulletin; Seep Site; Hydrocarbon Seep;
D O I：
10.1007/s003670050079
中图分类号：
学科分类号：
摘要：
Acoustic reflection signatures of four hydrocarbon seeps were classified using near-bottom 25-kHz echosounder profiles. Echo patterns were compared with ground-truth data obtained by submersible observations and shallow coring. Six echo types were distinguished: strong reflections from (1) exposed or (2) buried hard substrates, such as authigenic carbonate or gas hydrate; acoustic scattering in (3) unlayered or (4) layered sediments owing to gas, shells, or disseminated carbonates; (5) attenuation caused by gas; and (6) undisturbed sediments. Echo type distributions suggest that high spatial variability indicates a younger, vigorous seep, whereas extensive hard substrate implies an older, encrusted seep.
引用
收藏
页码：267 / 276
页数：9
相关论文
共 25 条
  • [1] Addy S.K., Worzel J.L., Gas seeps and subsurface structure off Panama City, Florida, American Association of Petroleum Geologists Bulletin, 63, pp. 668-675, (1979)
  • [2] Anderson A.L., Bryant W.R., Gassy sediment occurrence and properties: Northern Gulf of Mexico, Geo-Marine Letters, 10, pp. 209-220, (1990)
  • [3] Anderson A.L., Hampton L.D., Acoustics of gas-bearing sediments, Journal of the Acoustic Society of America, 67, pp. 1865-1903, (1980)
  • [4] Anderson R.K., Scalan R.S., Parker P.L., Behrens E.W., Seep oil and gas in Gulf of Mexico slope sediment, Science, 222, pp. 619-621, (1983)
  • [5] Behrens E.W., Geology of a continental slope oil seep, northern Gulf of Mexico, American Association of Petroleum Geologists Bulletin, 72, pp. 105-114, (1988)
  • [6] Holbrook W.S., Hoskins H., Wood W.T., Stephens R.A., Lizarralde D., Methane hydrate and free gas on the Blake Ridge from vertical seismic profiling, Science, 273, pp. 1840-1843, (1996)
  • [7] Hovland M., Judd A.G., Seabed Pockmarks and Seepages, (1988)
  • [8] Hyndman R.D., Davis E.E., A mechanism for the formation of mechane hydrate and seafloor bottom-simulating reflectors by vertical fluid expulsion, Journal of Geophysical Research, 97, pp. 7025-7041, (1992)
  • [9] Katzman R., Holbrook W.S., Paull C.K., Combined vertical-incidence and wide-angle seismic study of a gas hydrate zone, Blake Ridge, Journal of Geophysical Research, 99, pp. 17975-17995, (1994)
  • [10] Lee C.S., Geology of Hydrocarbon Seeps on the Northern Gulf of Mexico Continental Slope, (1995)
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