About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 65 (1981)

Issue: 5. (May)

First Page: 929

Last Page: 929

Title: Field Appraisal with 3-D Seismic Surveys, Offshore Trinidad: ABSTRACT

Author(s): Robert M. Galbraith, Alistair R. Brown

Article Type: Meeting abstract


The Southeast Coast Consortium block offshore eastern Trinidad contains four structures in each of which hydrocarbons have been discovered. Field appraisal to date had included two 3-D seismic surveys: the Pelican structure was surveyed in 1977 and, following its success, the Ibis 3-D survey was conducted in 1978.

The 3-D migrated data over both the Pelican and Ibis structures exhibit significant enhancement in the deeper part of the section and also improved fault resolution relative to previous 2-D control. On the north flank of the Pelican structure, primary dips have been recognized for the first time. As a consequence, estimated reserves have been increased by approximately 20%, thus substantially affecting development economics. Furthermore, the interpreted position of reserves in the minor reservoir sand has shifted from one fault block to another as a result of the revised fault interpretation. The acoustic nature of the stratigraphic boundary which may delimit this reservoir has been clearly demonstrated using seismic logs. Also the extent of this boundary has been manned from Seiscrop SUP>TM sections. The major change resulting from interpretation of the 3-D data at Ibis has been the definition of a much more complex fault pattern affecting all the reservoirs. This will have a significant impact on future field development plans. The 3-D seismic surveys are a useful tool for prospect evaluation in this area offshore Trinidad and should be considered prior to commitment to expensive offshore development programs.

End_of_Article - Last_Page 929------------

Copyright 1997 American Association of Petroleum Geologists