EXHIBIT 99.1

PRESS RELEASE       Contact:    Carrizo Oil & Gas, Inc.
                                B. Allen Connell, Director of Investor Relations
                                Paul F. Boling, Chief Financial Officer
                                (281) 496-1352

CARRIZO OIL & GAS,  INC.  COMPLETES  DEBT  FINANCING  AND UPDATES  THIRD QUARTER
OPERATIONS

HOUSTON,  November 3, 2004 - Carrizo Oil & Gas, Inc.  (Nasdaq:  CRZO)  announced
today that it has  entered  into a debt  agreement,  issuing  $18 million of 10%
secured senior subordinated Notes due in December 2008 (the "Notes").  The Notes
and  Carrizo's  Senior   Subordinated  Notes  are  held  by  affiliates  of  HBK
Investments L.P. (the  "Purchaser").  The Company's  obligations under the Notes
are (1)  secured  by a 2nd lien on  Carrizo's  assets  and (2)  subordinated  to
Carrizo's senior bank debt.

Net of a 10%  discount on the face  amount of the Notes  (before  debt  issuance
costs), the Company received proceeds of approximately  $16.2 million which will
primarily be used in its  aggressive  Barnett  Shale  development  which has now
grown to more than 20,000 net acres.  Current Barnett Shale  operations  include
the drilling of four horizontal wells (Operated: - in Wise County - 73% W.I. and
Parker County - 63% W.I.;  and  Non-operated:  - in Denton County - 22% W.I. and
Tarrant  County 22% W.I.).  These wells will bring  Carrizo's  well count in the
four counties to 59 gross (22 net).

The debt agreement  also provides  Carrizo the option to issue up to $10 million
of  additional  Notes to the  Purchaser  over the next two years  under the same
terms.  Certain terms and  conditions  of the Notes and other  Carrizo  options,
include: (1) no mandatory  amortization before maturity in 2008, (2) the option,
subject to certain conditions, to make interest payments,  principal prepayments
and payments at maturity with Carrizo's  common stock (issuable at 90 percent of
an average market price as determined prior to issuance),  (3) the option at any
time to redeem all or any portion of the  outstanding  Notes with no  prepayment
penalty and (4) a "PIK" interest  option,  during the period ended June 5, 2006,
to  pay-in-kind  50% of the interest due each period by increasing the principal
balance by a like amount.

Paul F. Boling, Carrizo's Vice President and Chief Financial Officer, commented,
"This  new  financing  provides  significant  flexibility  along  with  improved
liquidity  for the  Company,  funds to continue  aggressive  development  of our
Barnett Shale play and helps  optimize the level of borrowing  capacity with our
senior bank  facility.  Other than our option to use common stock as a source of
repayment, Carrizo has been able to obtain this financing without issuing common
equity."

Carrizo also today  announced  the  operating  results for the third  quarter of
2004. In South Texas and Louisiana,  the Company participated in the drilling of
eight gross exploratory  wells, six of which were successful,  resulting in a 75
percent apparent success rate for the quarter. One of the wells went to sales in
September,  four  more went  online  in  October  and one well is  waiting  on a
pipeline hookup.  As of the end of the third quarter,  drilling  operations were
underway on four  additional  wells.  Through the first nine months of the year,
Carrizo  drilled  29 wells,  23 of which were  successful,  for an  apparent  79
percent  success rate in South Texas and  Louisiana.  In the  Company's  Barnett
Shale play in North Texas,  Carrizo  participated in the drilling of eight gross
wells in the third quarter,  all of which were  successful.  Two wells have been
completed to sales and six wells are in the process of being completed. Drilling
operations are currently  underway on four  additional  wells,  all of which are
horizontals.  Since the  beginning  of the year,  Carrizo  has  drilled 27 gross
Barnett  Shale  wells,  all of which were  successful,  bringing our total to 59
gross wells with 32 wells on production.




Production  during the third  quarter of 2004 was  estimated to be 2.04 Bcfe, or
three percent  above the 1.99 Bcfe of production in the second  quarter of 2004.
Third  quarter 2004  production  would have been 2.08 Bcfe or five percent above
the  previous  quarter if not for the impact of (1)  shutdowns  on four wells in
South  Louisiana for Hurricane Ivan and (2) the six-day  workover of the Carrizo
operated  Shadyside #1 well in  September.  The  Shadyside #1 was placed back on
production on September  28, 2004.  Estimated  production  during the first nine
months of 2004 has reached a level of 5.89 Bcfe or five  percent  above the 5.61
Bcfe of production in the first nine months of 2003.

Natural  gas  comprised  79  percent  of total  third  quarter  2004  production
equivalent.  Carrizo  estimates  that third  quarter 2004 sales prices  averaged
approximately  $5.70 per Mcf and $43.57 per  barrel.  These  prices  include the
effects of hedging  activities,  which  resulted in a decrease  of the  realized
price of  natural  gas by  approximately  $0.13  per Mcf and a  decrease  in the
realized price of oil by approximately $2.44 per barrel.

"While production in the third quarter continued our sequential growth, it would
have been more favorable  without the impact of Hurricane Ivan, the Shadyside #1
workover  and delays in  completions,"  commented  S.P.  Johnson  IV,  Carrizo's
President and Chief  Executive  Officer.  "We are quite  encouraged by the rapid
increase in  production  in the second half of October.  Production is currently
26.0  Mmcfe per day  compared  to the  average  22.2  Mmcfe per day in the third
quarter.  In addition,  we expect  additional  production  from three Gulf Coast
wells and several Barnett Shales currently being completed to sales."

Carrizo Oil & Gas, Inc., is a Houston-based  energy company  actively engaged in
the exploration, development, exploitation and production of oil and natural gas
primarily  in proven  onshore  trends along the Texas and  Louisiana  Gulf Coast
regions.  Carrizo controls  significant  prospective acreage blocks and utilizes
advanced 3-D seismic  techniques to identify  potential oil and gas reserves and
drilling opportunities.

Additional  information regarding the Notes and related transactions is included
in the Company's  Current Report on Form 8-K, expected to be filed soon with the
SEC.

Statements in this news release,  including but not limited to those relating to
the  Company's  or  management's  intentions,   beliefs,  expectations,   hopes,
projections,  assessment of risks,  estimations,  plans or  predictions  for the
future  including  the use of proceeds,  options to issue common stock or Notes,
potential effects or timing,  cash flow,  reserve growth and shareholder  value,
the  expected  timing of drilling of  additional  wells,  plans for the drilling
program and other  statements and other statements that are not historical facts
are forward looking statements that are based on current expectations.  Although
the Company believes that its expectations are based on reasonable  assumptions,
it can give no assurance that these  expectations will prove correct.  Important
factors that could cause actual results to differ  materially  from those in the
forward looking statements  include the satisfaction of required  conditions for
the exercise of the option for the Company to issue additional Notes or to issue
common stock,  the results and  dependence on exploratory  drilling  activities,
operating  risks,  oil  and gas  price  levels,  land  issues,  availability  of
equipment,  weather and other risks described in the Company's Form 10-K for the
year ended  December  31, 2003 and its other  filings  with the  Securities  and
Exchange Commission.