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First Comprehensive Pre-salt Study of Brazil’s Prolific Offshore
Hydrocarbon Basins

HOUSTON, April 27 /PRNewswire-FirstCall/ — ION Geophysical Corporation
(NYSE: IO) today announced that it has completed the first phase of its
BrasilSPAN(TM) seismic data program and delivered the processed data, seismic
images, and an integrated interpretation. BrasilSPAN is the first
comprehensive, pre-salt geophysical study of Brazil’s prolific offshore
hydrocarbon basins in which several multi-billion barrel discoveries have been
announced in recent years.

Ken Williamson, Senior Vice President of ION’s Integrated Seismic
Solutions group, commented, “BrasilSPAN provides our E&P clients with a
pioneering regional framework in which to objectively identify exploration
opportunities in highly prospective regions along the continental margins of
the southern Atlantic Ocean. The data showcases excellent imaging of Brazil’s
pre-salt sedimentary sequence, crustal architecture, and the ocean-continent
transition.”

BrasilSPAN is comprised of 12,000 km of seismic data that images the
entire crustal section in Brazil’s Santos, Campos and Espirito Santos
hydrocarbon basins. ION worked closely with regional experts to design the
survey and tie the acquired seismic data lines to critical wells in the basins
of interest. The program was acquired with long offsets, long listen times
and imaged with proprietary reverse time migration (RTM) technology from ION’s
GX Technology (GXT) seismic imaging subsidiary to provide improved resolution
in the pre-salt and salt flanks.

BrasilSPAN was planned in partnership with ION’s AfricaSPAN(TM) customers
in order to address questions of great interest to global exploration teams,
including how the ‘conjugate ties’ between West Africa and Brazil affect the
exploration potential along the continental margins on both sides of the
present-day Atlantic Ocean.

The regional, conjugate, and interpretative studies that are part of the
BrasilSPAN program will assist in providing an understanding of the mechanism
for the break-up of the continents, help develop and de-risk exploration play
concepts, and provide a framework to characterize the hydrocarbon potential
along the offshore margins of both West Africa and Brazil.

BrasilSPAN is available for immediate delivery. To learn more about ION’s
BrasilSPAN program, visit www.iongeo.com/brasilspan.

About ION

ION is a leading provider of geophysical technology, services, and
solutions for the global oil & gas industry. ION’s offerings allow E&P
operators to obtain higher resolution images of the subsurface to reduce the
risk of exploration and reservoir development, and enable seismic contractors
to acquire geophysical data more efficiently. Additional information about ION
is available at www.iongeo.com.

The information included herein contains forward-looking statements within
the meaning of Section 27A of the Securities Act of 1933 and Section 21E of
the Securities Exchange Act of 1934. Actual results may vary fundamentally
from those described in these forward-looking statements. All forward-looking
statements reflect numerous assumptions and involve a number of risks and
uncertainties. These risks and uncertainties include risk factors that are
disclosed by ION from time to time in its filings with the Securities and
Exchange Commission
.

Contacts
ION (Investor relations)
Chief Financial Officer Brian Hanson, +1 281.879.3672

ION (Media relations)
Director – Marketing Programs Karen Abercrombie, +1 713.366.7281
karen.abercrombie@iongeo.com

SOURCE ION Geophysical Corporation

Web Site: http://www.iongeo.com
(IO)