Patent Number: 6,311,132

Title: Method and apparatus for detecting shallow water flow sands using converted shear waves

Abstract: A method and apparatus for seismic detection of shallow drilling hazards, especially overpressured shallow waterflow sands. In one embodiment, a seismic survey is performed to obtain both compression and converted shear type seismic data. After processing, the seismic data is analyzed to identify possible correlations between reflection events observable in the shear seismic data and reflection events observable in the compression seismic data. At depths of up to at least 3,500 feet below the sea floor, any such correlation is indicative of the presence of sands.

Inventors: Rosenquist; Mark L. (Sugar Land, TX), Dwan; Fa S. (Houston, TX), Bryndzia; L. Taras (Houston, TX), Pelletier; John H. (Houston, TX)

Assignee: Shell Oil Company

International Classification: G01V 1/28 (20060101); G01V 001/28 ()

Expiration Date: 10/30/2018