The site focuses on earthquake
as well as volcanic activity, with information on tsunamis, severe
weather conditions and space weather. The success of the EH#3A extended test marks the
Company's first major step in the integration of our development model for
Petrogen 's Emily Hawes Field prospect, effectively proving out the initial
stages of our business development strategy for our Texas Gulf Coast
objectives. is a Houston, Texas based energy company currently pursuing
and developing natural gas properties with proven reserves in the Texas Gulf
Coast and Permian Basin regions.

It is named after Saint Thomas Day, the day of its discovery by Portuguese explorers .

kilometers volcanic

is the founder and CEO of
geoForecaster.

About ERHC

ERHC is an independent oil and gas company focused on exploration
in the Gulf of Guinea offshore West Africa."
Petrogen recently increased its working interest on Emily Hawes Field to
75%. Near term plans include the
expansion of operations through the development of a number of infill and
step-out drilling locations targeted at the Basal Miocene Sands within the
Emily Hawes Field after the completion and hook-up of the EH #3A well.

About Matagorda Island
Matagorda Island is one of seven barrier islands located in the Gulf of
Mexico, Texas Gulf Coast.

THIS NEWS RELEASE MAY INCLUDE FORWARD-LOOKING STATEMENTS WITHIN THE
MEANING OF SECTION 27A OF THE UNITED STATES SECURITIES ACT OF 1933, AS
AMENDED , AND SECTION 21E OF THE UNITED STATES SECURITIES AND EXCHANGE ACT OF
1934, AS AMENDED, WITH RESPECT TO ACHIEVING CORPORATE OBJECTIVES, DEVELOPING
ADDITIONAL PROJECT INTERESTS, THE COMPANY'S ANALYSIS OF OPPORTUNITIES IN THE
ACQUISITION AND DEVELOPMENT OF VARIOUS PROJECT INTERESTS AND CERTAIN OTHER
MATTERS.

tome distanced

The Company plans to
complete the well within the month of May, utilizing a gravel pack and then
connecting the well to the Company's gas gathering pipeline. The well initially measured a shut-in
tubing pressure of 2,083 psi.

extinct equator

Kozuch has been Project
Director for international scientific campaigns in the Caribbean and
leader of numerous research initiatives in Latin America and the
United States.
In Block 2, the ERHC/Devon/Pioneer consortium has been awarded 65%
interest, which is inclusive of ERHC's 30% signature bonus free
interest. Corporate Development + Communications President
Petrogen Corp.

named portuguese

Kozuch, Ph.com

Professor Nicholas Pinter, of Southern Illinois University ,
Department of Geology, has expertise in the general area of geological
hazards, and in earthquakes in particular.
618-453-7375
618-453-5351 (University PR Phone)

Professor Stephen Pessiki , of Lehigh University, Department of
Civil Engineering, is an expert regarding structural engineering and
earthquake engineering. The consortium has been designated operator for Block 4.erhc.
Petrogen's Chairman and CEO, Sacha H. At the conclusion of a two-hour
shut-in period immediately following the test, the well recorded a final shut-
in tubing pressure of 1,960 psi.

discovery distanced

Business Editors
ADVISORY.D.
"The announcement of the awards is a significant milestone for
ERHC. These statements and the business
prospects of ERHC are subject to a number of risks and uncertainties
that may cause actual results in future periods to differ materially
from the forward-looking statements.
(OTC Bulletin Board: PTGC) announced today that it has completed an extended
test of its Texas Gulf Coast discovery well, the Emily Hawes #3A ("EH#3A")
located within Petrogen's Emily Hawes Field, as part of the well's completion
and pipeline connection program first reported in the Company's May 10, 2005
news release.

CONTACTS:

Company Contact Investor Relations Contact
Louis J.
888-875-1155 361-949-4999
barry@grosscapital.

explorers tome

PR Contact: Keith Thomas
925-284-0444
keith@krtmarketing. The consortium has been designated operator for Block 2.3 bcfg of previously producing natural
gas reserves. Fruchier Barry Gross
V.

So Tom , the sizable southern island, is situated almost exactly on the equator.

ncipe tiny

Journalists are encouraged to submit queries to
ExpertSource when seeking experts on specific subjects.

Business Editors /Energy Editors

HOUSTON----The Nigeria-Sao Tome and
Principe Joint Development Authority (JDA ) issued a press statement on
May 31, 2005 announcing the award of five blocks on offer in the 2004
JDZ Licensing Round. ERHC's interest in Block 6 is
free of signature bonus.

Petrogen's Emily Hawes #3A Well Flows Gas

explorers distanced

ADVISORY/Experts Available to Discuss Earthquake Off West Coast of Sumatra

Dr.

140 250

com, a subscriber-based Internet Web site dedicated to
providing reliable, accurate and timely forecasts and reporting of
major natural hazards around the globe.com .

distanced exactly

----

The U .

ExpertSource can offer several highly qualified experts
to comment on this story:

Dr. An online
registration form is available at http://www. Petrogen
anticipates receipt of initial production revenues within approximately sixty
days after the well's completion.3% methane with 1,025 BTU/cubic foot content. The increased working interest, coupled with its pipeline
acquisition , strategically positions the Company to implement its development
and expansion program in the Texas Gulf Coast while also ensuring our control
of the necessary infrastructure, helping secure the Company 's current and
future presence as a viable Gulf Coast operator.

kilometers 225

610-758-3494

ExpertSource cannot guarantee the immediate availability of these
experts or their familiarity with this specific issue. At the end of the sixty-five hour test, well flow
rates increased to 750 mcfgd on a 12/64 " choke with flowing tubing pressure of
1,420 psi against 400 psi back-pressure. Over the past few years, several large discoveries by
Shell, BP and Chevron Texaco have contributed to the growing prominence of the
Gulf Coast region as a hotbed for the expansion of domestic natural gas
developments . For further information, please visit the
Company's website at http://www.P.

250 almost

- Texas Gulf Coast Well Readied for Hook-Up to Pipeline;
Sales of Natural Gas -

HOUSTON, Petrogen Corp. THESE STATEMENTS ARE MADE UNDER THE "SAFE HARBOR" PROVISIONS OF THE
UNITED STATES PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995 AND INVOLVE
RISKS AND UNCERTAINTIES WHICH COULD CAUSE ACTUAL RESULTS TO DIFFER MATERIALLY
FROM THOSE IN THE FORWARD-LOOKING STATEMENTS CONTAINED HEREIN.

250 portuguese

businesswire.
ERHC Energy Inc. After approximately twelve hours of additional
clean -up time, well flow was measured at 660 mcfgd with flowing tubing
pressure of 1,405 psi.com

africa equator

. Today, Texas and the Texas Gulf Coast represent one
of the premier oil and gas exploration regions in the world, accounting for
32% of all natural gas production and 27% of proved natural gas reserves in
the United States.

sizable almost

ERHC's headquarters are in
Houston, Texas.com
The statements in this document are forward-looking statements
made pursuant to the Safe Harbor Provisions of the Private Securities
Litigation Reform Act of 1995. The extended test resulted in a stabilized natural gas
production rate of 750 mcfgd through a 12/64" choke. Initial production rates were measured at
266 mcfgd on a 10/64" choke with 1,337 psi flowing tubing pressure against
400 psi of back -pressure.
Subsequently, the choke size was increased to 12/64", at which time production
immediately increased to 586 mcfgd with 1,330 psi flowing tubing pressure
against 400 psi back-pressure.

Sao Tome and PrincipeThe Democratic Republic of So Tom and Prncipe is a tiny two-island nation in the Gulf of Guinea, distanced 140 kilometers from one another, and situated about 250 and 225 kilometers, respectively , off the northwestern coast of Gabon.

volcanic extinct

(ERHC) (OTCBB:ERHE) had previously exercised its
option rights in all the five Blocks on offer in the 2004 JDZ
Licensing Round, and in December 2004 submitted bids as a consortium
member for Blocks 2, 3 and 4."
On November 23, 2004, Petrogen announced that it successfully tested
natural gas from the EH#3A well from the Basal Miocene M1 sand with an
absolute open flow of 1,998 mcfgd; 978 mcfgd was tested on a 14/64" choke with
flowing tubing pressure of 1,395 psi and a final shut-in pressure of
1,950 psi.
The Emily Hawes Field property is located approximately 90 miles southwest
of Houston, Texas within the prolific oil and gas producing Miocene -Frio trend
of the onshore and offshore Texas Gulf Coast. Matagorda Island is approximately 34 miles long by 4 miles wide
and is situated along the prolific, natural gas producing Miocene/Frio trend .

kilometers exactly

Geological Survey reported an earthquake, which
was registered at 8. Michael J. Spindler stated , "We are very
pleased with the results achieved from Petrogen's EH#3A wellbore, which
provides the platform for the next phases of our ongoing development
initiatives on Matagorda Island and within the very prolific Texas Gulf Coast
natural gas area play. Spindler further stated, "Petrogen's ongoing development plans for the
Emily Hawes Field include an aggressive development agenda focused upon
expanding gas production from the Miocene Sands over the entire aerial extent
of the Emily Hawes Field through potentially spudding up to as many as three
additional Miocene wells during the 2005 drilling season to attempt
exploitation of the approximately 12.petrogencorp. Gross Capital, Inc.

exactly africa

7, struck just off Indonesia's Sumatra Island
Monday, according to an article by The Associated Press.com/

After approximately twenty-four hours of
production , flow rates were measured at 421 mcfgd on a 10/64" choke with
1,428 psi flowing tubing pressure against 400 psi back-pressure.

About Petrogen
Petrogen Corp.

northwestern gabon

We look forward to working with the JDA and other participants
towards developing the petroleum resources in the JDZ for the mutual
benefit of the peoples of Nigeria and Sao Tome + Principe as well as
our respective companies ," commented Ali Memon, President + CEO of
ERHC.

explorers almost

As a result,
tsunami warnings have been issued in Thailand, Japan and Sri Lanka. For more information, visit ERHC's Web site at
www.

gabon respectively

S.
In Block 4, the ERHC/Noble consortium has been awarded 60%
interest, which is inclusive of ERHC 's 25% signature bonus free
interest. These risks and uncertainties are
described on Forms 10-Q and 10-K filed with the Securities and
Exchange Commission.
On May 7, 2005, crews were mobilized to Emily Hawes Field and immediately
began the extended production test.
Mr.

Both islands are part of an extinct volcanic mountain range.

guinea distanced

Residents in coastal areas in northern Malaysia are being evacuated as
a precaution.
In Block 3, the ERHC/Devon/Pioneer consortium has been awarded 25%
interest, which is inclusive of ERHC's 20% signature bonus free
interest. Analysis of the gas produced during this
test measured 97. The Company is
currently preparing to complete the EH#3A well by installing a gravel pack and
subsequently, connecting it to the Company's pipeline .

Source: Wikipedia.

discovery exactly

ERHC - Awards Announced in the 2004 JDZ Licensing Round

distanced explorers

.

ExpertSource provides academic and industry experts to the media
at no charge.
In making the awards for Blocks 5 and 6, the JDA confirmed ERHC's
15% interest in each of these Blocks. Additionally, the Company recently purchased the Matagorda Island
natural gas gathering pipeline, the only existing natural gas right-of-way on
Matagorda Island.