EXHIBIT 99.1

Gasco
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Energy

For Release at 8:00 AM EDT on Monday, April 18, 2005

GASCO ENERGY PROVIDES ESTIMATES OF PROBABLE AND POSSIBLE RESERVES
ON PART OF ITS RIVERBEND PROJECT

DENVER - (PR Newswire) - April 18, 2005 - Gasco Energy, Inc. (AMEX: GSX) today
provided results of its recent estimated probable and possible reserve analysis,
also known as 3-P reserve estimates. Gasco is providing these results to provide
additional insight into the future potential of Gasco's Riverbend Project in
Utah's Uinta Basin. In accordance with SEC guidelines, only proved reserves can
be included in documents filed with the SEC. Gasco's previously reported 2004
year-end proved reserves were 41.3 billion cubic feet equivalent (Bcfe).

3-P Estimates
Estimates of probable and possible reserves were prepared by independent
reservoir engineering consultants, Netherland Sewell and Associates, the same
firm that engineers Gasco's year-end proved reserves. The analysis encompasses
approximately 34,000 gross acres of Gasco's Riverbend Project. At December 31,
2004, Gasco owned or controlled approximately 136,777 gross acres and 68,959 net
acres in the Riverbend Project. The 3-P estimates below reflect approximately
25% of Gasco's gross Riverbend acreage position. The analysis does not include
petroleum resource potential over the remaining 75% of Gasco's Riverbend
acreage.

Gasco Energy, Inc. 3-P at 12/31/04
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Gross Gasco Net Interest
Bbls MMcf MMcfe Bbls MMcf MMcfe

Proved 526,318 72,634 75,792 289,075 37,824 39,558
Probable 2,650,200 378,600 394,500 1,668,600 231,218 241,232
Possible 14,551,600 2,078,800 2,166,112 6,707,655 929,471 969,719
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Total 17,727,118 2,530,034 2,636,404 8,665,330 1,198,513 1,250,509
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The estimated probable reserve analysis was based on approximately 252 potential
well locations. The estimated possible reserve analysis was based on
approximately 1,403 potential well locations. The price deck used in calculating
the estimated probable and possible reserves was $5.50 per Mcf and $45.00 per
barrel of crude oil net at the wellhead.

Definition - Reserves
Reserves are those quantities of crude oil, natural gas, and natural gas liquids
that are anticipated to be commercially recovered from known accumulations from
a given date forward. Reserve estimates involve varying degrees of uncertainty,
depending largely on the amount of reliable geological and engineering data
available at the time of the estimate and the interpretation of the data. The
relative degree of uncertainty can be conveyed by broadly placing reserves into
one of two categories -- proved or unproved.

Two basic methods are commonly used by industry to prepare reserve estimates --
the deterministic and probabilistic methods. The deterministic method yields a
single best estimate of reserves based on known geological, engineering and

economic data. The probabilistic method uses known geological, engineering and
economic data to generate a range of estimated reserve quantities and their
associated probabilities. Each reserve classification gives an indication of the
probability of recovery.

Definition - Proved Reserves
Proved reserves are those quantities of crude oil, natural gas, and natural gas
liquids which geological and engineering data demonstrate with reasonable
certainty to be recoverable in future years from known reservoirs under existing
economic and operating conditions. Proved developed reserves include proved
developed producing reserves and proved developed behind-pipe reserves. Proved
developed producing reserves are only those reserves expected to be recovered
from existing completion intervals in existing wells. Proved developed
behind-pipe reserves are those reserves expected to be recovered from existing
wells where a relatively minor capital expenditure is required for recompletion.
Proved undeveloped reserves are those reserves expected to be recovered from new
wells on undrilled acreage or from existing wells where a relatively major
expenditure is required for recompletion.

Definition - Unproved Reserves
Unproved reserves are considered less certain to be recovered than proved
reserves. Estimates of unproved reserves are based on geologic and/or
engineering data similar to that used to estimate proved reserves, but
technical, contractual, economic considerations and/or SEC, state or other
regulations preclude such reserves from being classified as proved. Unproved
reserves may be further sub-classified as probable and possible to denote
progressively increasing uncertainty of recoverability. Importantly, estimation
of unproved reserves may assume future economic conditions different than those
prevailing at the time of the estimate. The effect of possible future
improvements in economic conditions and technological developments can be
expressed by allocating appropriate quantities of reserves to the probable and
possible classifications.

Definition - Probable Reserves
Probable reserves are estimates of unproved reserves which analysis of
geological and engineering data suggests are more likely than not to be
recoverable. For estimates of probable reserves based on probabilistic methods,
there should be at least a 50% probability that the quantities of reserves
actually recoverable will equal or exceed the sum of the estimated proved plus
probable reserves. Probable reserves may include:

1. reserves in formations known to be productive where SEC regulations

limit recognition of proved reserves to direct-offset locations one

legal spacing-unit away from a producing well;

2. reserves anticipated to be proved by normal step-out drilling where

subsurface control is currently inadequate to classify these

reserves as proved;

3. reserves in formations that appear to be productive based on

well-log characteristics but lack core data or other definitive

tests to indicate productive potential and which are not analogous

to producing or proved reserves in the area;

4. incremental reserves attributable to infill drilling that could have

been classified as proved if closer statutory spacing had been

approved at the time of the estimate;

5. reserves attributable to improved recovery methods that have been

established by repeated commercially successful applications where:

a. a project or pilot is planned but not in operation; and

b. rock, fluid and reservoir characteristics appear favorable for

commercial application;

6. reserves in an area of the formation that appears to be separated

from the proved area by faulting and where geologic interpretation

indicates that the area is structurally higher than the proved area;

7. reserves attributable to future workover, treatment, re-treatment,

change of equipment, or other mechanical procedures, where such

mechanical procedure has not been proved successful in wells which

exhibit similar behavior in analogous reservoirs; and/or

8. incremental reserves in proved reservoirs where an alternative

interpretation of performance or volumetric data indicates more

reserves are present than can be classified as proved.

Definition - Possible Reserves
Possible reserves are estimates of unproved reserves which analysis of
geological and engineering data suggests are less likely to be recovered than
probable reserves. For estimates of possible reserves based on probabilistic
methods, there should be at least a 10% probability that the quantities of
reserves actually recovered will equal or exceed the sum of the estimated proved
plus probable plus possible reserves.

Possible reserves may include:

1. reserves which, based on geological interpretations, could possibly

extend beyond areas classified as probable;

2. reserves in formations that appear to be petroleum bearing based on

log and core analysis but may not be productive at commercial rates;

3. incremental reserves attributed to infill drilling that are subject

to technical uncertainty;

4. reserves attributed to improved recovery methods where:

a. a project or pilot is planned but not in operation; and

b. rock, fluid and reservoir characteristics are such that there

is a reasonable doubt that the project will be commercial;

and/or

5. reserves in an area of the formation that appears to be separated

from the proved area by faulting and where geological interpretation

indicates the area is structurally lower than the proved area.

About Gasco Energy
Gasco Energy, Inc. is a Denver-based natural gas and oil exploitation and
development company that focuses on natural-gas-rich prospects in the Rocky
Mountain area of the United States. The Company currently is active in the Uinta
Basin in Utah and controls acreage in the Greater Green River Basin of Wyoming.
To learn more, visit www.gascoenergy.com.

Forward-looking statements
The SEC has generally permitted oil and gas companies, in filings made with the
SEC, to disclose only proved reserves that a company has demonstrated by actual
production or conclusive formation tests to be economically and legally
producible under existing economic and operating conditions. We use the terms
"probable" and "possible" reserves or other descriptions of volumes of reserves
potentially recoverable through additional drilling or recovery techniques that
the SEC's guidelines may prohibit us from including in filings with the SEC.
These estimates are by their nature more speculative than estimates of proved
reserves and accordingly are subject to substantially greater risk of being
actually realized by the company.

Certain statements set forth in this press release relate to management's future
plans, objectives and expectations. Such statements are forward-looking within
the meanings of Section 27A of the Securities Act of 1933, as amended, and
Section 21E of the Securities Exchange Act of 1934, as amended. All statements
other than statements of historical facts included in this press release,
including, without limitation, statements regarding the Company's future
financial position, potential resources, business strategy, budgets, projected
costs and plans and objectives of management for future operations, are
forward-looking statements. In addition, forward-looking statements generally
can be identified by the use of forward-looking terminology such as "may,"
"will," "expect," "intend," "project," "estimate," "anticipate," "believe," or
"continue" or the negative thereof or similar terminology. Although any
forward-looking statements contained in this press release are to the knowledge
or in the judgment of the officers and directors of the Company, believed to be
reasonable, there can be no assurances that any of these expectations will prove
correct or that any of the actions that are planned will be taken.
Forward-looking statements involve known and unknown risks and uncertainties
that may cause the Company's actual performance and financial results in future
periods to differ materially from any projection, estimate or forecasted result.
Some of the key factors that may cause actual results to vary from those the
Company expects include inherent uncertainties in interpreting engineering and
reserve or production data; operating hazards; delays or cancellations of
drilling operations because of weather and other natural and economic forces;
fluctuations in oil and natural gas prices in response to changes in supply;
competition from other companies with greater resources; environmental and other
government regulations; defects in title to properties; increases in the
Company's cost of borrowing or inability or unavailability of capital resources
to fund capital expenditures; and other risks described under "Risk Factors" in
Item 1. of the Company's 2004 Form 10-K filed with the Securities and Exchange
Commission on March 16, 2005.

Contact for Gasco Energy, Inc.: Investor Relations: 303-483-0044

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