Advertisement

The Acoustic Response of Some Gas-Charged Sediments in the Northern Adriatic Sea

  • Antonio Stefanon
Part of the NATO Conference Series book series (NATOCS, volume 5)

Abstract

High-resolution profiles obtained in the northern Adriatic Sea with a Uniboom (EG&G) sub-bottom profiling system revealed peculiar acoustic features down to a depth of about 70 m below the sediment surface. Several different structures due to high gas contents are described and explained for the first time in the northern Adriatic. They range from the so-called “basin effect” and cone-like structures to acoustic voids. Gas seeping from the bottom has also been observed. The abrupt disappearance of acoustically significant horizons is discussed, and a tentative explanation is given. Possible migration of gases and trapping effect are also discussed. The importance of high--quality, high-resolution recording is stressed in order to detect the anomalies — due to gases — in the sea floor, and to evaluate their potential as geologic hazards for offshore installations.

Keywords

Well Bore Acoustic Response Seismic Stratigraphy Offshore Drilling Significant Horizon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Selected references

  1. Boldrin, A., Rabitti, S., and Stefanon, A., in preparation, Program for the T.I. 59 calculator to obtain corrected water and strata depths from Uniboom and sparker records.Google Scholar
  2. Colantoni, P., and Gallignani, P., 1978, Ricerche sulla piattaforma continentale dell’Alto Adriatico. Quaderno n° 1, Consiglic Nazionale delle Ricerche, Roma.Google Scholar
  3. Payton, C. E., 1977,“Seismic stratigraphy — applications to hydrocarbon exploration”, The American Association of Petroleum Geologists, Tulsa.Google Scholar
  4. Sieck, H.C., 1973, Gas-charged sediment cones post possible hazards to offshore drilling, Oil and Gas J. July 16.Google Scholar
  5. Whiticar, M. J., 1978, Relationships of interstitial gases and fluids during early diagenesis in some marine sediments, “Report S. F. B. 95” Kiel Universyty, Kiel.Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Antonio Stefanon
    • 1
  1. 1.Istituto di Biologia del MareC.N.R.VeneziaItaly

Personalised recommendations