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VectorSeis(R) System Four(TM) Technology Enables Acquisition of Higher Quality

Images to Increase Oil Company Understanding of the Subsurface

HOUSTON, Nov. 20 /PRNewswire-FirstCall/ — Input/Output, Inc. (NYSE: IO)
and PetroAlliance Services Company Limited today announced an agreement for
PetroAlliance to purchase VectorSeis System Four technology for land seismic
acquisition. VectorSeis acquisition systems deliver higher quality seismic
data for improved reservoir characterization and time-lapse (4D) surveys.

“PetroAlliance’s purchase of I/O’s VectorSeis System Four illustrates
another of our key investments in next generation technology that will further
build our leadership in the Russian market,” said Andre Niziev,
PetroAlliance’s Vice President of Seismic Operations. “VectorSeis enables us
to deliver leading edge imaging solutions for our customers while reducing
cycle-time and cost through faster field deployment. As we expand our
partnership with I/O, we are positioned to deliver significant improvement in
operational efficiencies and seismic image quality, including providing our
customers with an option to cost-effectively acquire full wave, multicomponent
data.”

Jorge Machnizh, I/O’s Chief Operating Officer, added, “Input/Output is
very excited to expand our partnership with PetroAlliance, a premier seismic
acquisition contractor and a leader in this key market. PetroAlliance’s
purchase of I/O’s VectorSeis System Four supports our strategy to expand I/O’s
international business and increase our penetration in hydrocarbon-rich
regions such as the Former Soviet Union. Our new and existing clients are
already generating returns on their investment in VectorSeis digital
technology by reducing E&P risks, optimizing well placement, and maximizing
production. I/O’s technology provides geoscientists and reservoir engineers
with the highest confidence in their subsurface interpretations and reservoir
management decisions.”

VectorSeis technology improves the resolution of seismic images and more
accurately defines subtle hydrocarbon accumulation features. VectorSeis
enables seismic contractors to obtain best-in-class, single component pressure
wave data on behalf of their oil company customers, while also providing the
flexibility to record full wave, multicomponent data needed to take reservoir
resolution to the next level of detail.

VectorSeis is I/O’s technology platform for developing next-generation
seismic acquisition systems for land, seabed and in-well imaging. The all-
digital acquisition systems have been proven in 60 surveys and more than
400 million traces worldwide.

Input/Output, Inc. is the major independent provider of seismic equipment
and acquisition imaging technology for land, marine, and seabed applications.
In addition, through its GMG/AXIS group, I/O offers specialty seismic
processing services — including anisotropic velocity modeling — that allow
oil companies to more accurately image subsurface features in petroleum
reservoirs. The company’s technologies are applied in traditional 2D and 3D
surveys along with rapidly growing areas like time-lapse 4D reservoir
monitoring and full wave, multicomponent data acquisition. I/O has offices in
the United States, Canada, Europe, China and the Middle East. Additional
information about Input/Output, Inc. is available at www.i-o.com .

PetroAlliance is one of Russia’s largest service companies, providing a
broad range of exploration and development services for oil and gas fields in
line with world standards. Additional information about PetroAlliance is
available at www.petroal.ru .

CONTACTS:

Input/Output, Inc.

Phone: +1.281.552.3000

Pamela Griffin – Corporate Communications

PetroAlliance Services Company

Phone: (095) 797.93.93

Brad Eastman

Chief Administrative officer

INPUT/OUTPUT

(281) 879-3605

Jack Lascar, Partner

Karen Roan, Vice President

DRG&E / 713-529-6600

SOURCE Input/Output, Inc. 11/20/2003

CONTACT: Pamela Griffin, Corporate Communications, +1-281-552-3000, or
Brad Eastman, Chief Administrative officer, +1-281-879-3605, both of Input-
Output, Inc.; or PetroAlliance Services Company Limited, +095-797-93-93; or
Jack Lascar, Partner, or Karen Roan, Vice President, both of DRG&E,
+1-713-529-6600, for Input-Output, Inc.

Web site: http://www.i-o.com

http://www.petroal.ru

(IO)

CO: Input/Output, Inc.; PetroAlliance Services Company Limited

ST: Texas, Russia

IN: OIL CPR

SU: