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February 4, 2010

Mr. Clifford J. Williams

W&T Offshore, Inc.

1100 Poydras Street, Suite 1100

New Orleans,
Louisiana 70163

Dear Mr. Williams:

In accordance with your request, we have estimated the proved reserves and future revenue, as of December 31, 2009, to the W&T Offshore, Inc. (W&T) interest in certain oil and gas properties located in state waters offshore
Louisiana and Texas and in federal waters in the Gulf of Mexico. It is our understanding that the proved reserves estimated in this report constitute all of the proved reserves owned by W&T. The estimates in this report have been prepared in
accordance with the definitions and guidelines of the U.S. Securities and Exchange Commission (SEC) and conform to the FASB Accounting Standards Codification Topic 932, Extractive ActivitiesOil and Gas, except that future income taxes are
excluded for all properties and, at your request, future abandonment costs have not been included in our estimates of future net revenue. Definitions are presented immediately following this letter. This report has been prepared for W&Ts
use in filing with the SEC.

We estimate the net reserves and future net revenue to the W&T interest in these properties, as of
December 31, 2009, to be:



|                               |  |              |  |                             |  |           |  |             |  |                    
|------------------------------ |  | ------------ |  | --------------------------- |  | --------- |  | ----------- |  | -------------------
|                               |  | Net Reserves |  | Future Net Revenue (1) (M$)
|Category                       |  | Oil(MBBL)    |  | NGL(MBBL)                   |  | Gas(MMCF) |  | Total       |  | Present Worthat 10%
|Proved Developed Producing     |  | 11,220.9     |  | 1,446.2                     |  | 86,561.0  |  | 649,368.5   |  | 531,316.6          
|Proved Developed Non-Producing |  | 10,090.4     |  | 951.0                       |  | 54,714.2  |  | 545,034.2   |  | 284,010.7          
|Proved Undeveloped             |  | 9,915.9      |  | 578.0                       |  | 24,481.9  |  | 462,228.5   |  | 307,921.6          
|                               |  |              |  |                             |  |           |  |             |  |                    
|Total Proved                   |  | 31,227.3     |  | 2,975.2                     |  | 165,757.2 |  | 1,656,631.0 |  | 1,123,248.8        

Totals may not add because of
rounding.



|(1) | Future revenue does not include estimated abandonment costs.
|--- | ------------------------------------------------------------

The oil reserves shown include crude oil and condensate. Oil and natural gas liquids (NGL) volumes are expressed in thousands of barrels (MBBL); a barrel is equivalent to 42 United States gallons. Gas
volumes are expressed in millions of cubic feet (MMCF) at standard temperature and pressure bases.

The estimates shown in this report are for
proved reserves. As requested, probable and possible reserves that exist for these properties have not been included. This report does not include any value that could be attributed to interests in undeveloped acreage beyond those tracts for which
undeveloped reserves have been estimated. Reserves categorization conveys the relative degree of certainty; reserves subcategorization is based on development and production status. The estimates of reserves and future revenue included herein have
not been adjusted for risk.

Future gross revenue to the W&T interest is prior to deducting state production taxes and ad valorem taxes.
Future net revenue is after deductions for these taxes, future capital costs, and operating expenses but before consideration of federal income taxes. The future net revenue has been discounted at an annual rate of 10 percent to determine its
present worth. The present worth is shown to indicate the effect of time on the value of money and should not be construed as being the fair market value of the properties.

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For the purposes of this report, we did not perform any field inspection of the properties, nor did we
examine the mechanical operation or condition of the wells and facilities. We have not investigated possible environmental liability related to the properties; therefore, our estimates do not include any costs due to such possible liability. Also,
our estimates do not include any salvage value for the lease and well equipment or the cost of abandoning the properties.

Prices used in this
report are based on the 12-month unweighted arithmetic average of the first-day-of-the-month price for the period January through December 2009. For oil and NGL volumes, the average West Texas Intermediate posted price of $57.65 per barrel is
adjusted by lease for quality, transportation fees, and regional price differentials. For gas volumes, the average Henry Hub spot price of $3.866 per MMBTU is adjusted by lease for energy content, transportation fees, and regional price
differentials. All prices are held constant throughout the lives of the properties.

Lease and well operating costs used in this report are
based on operating expense records of W&T. For nonoperated properties, these costs include the per-well overhead expenses allowed under joint operating agreements along with estimates of costs to be incurred at and below the district and field
levels. As requested, lease and well operating costs for the operated properties include direct lease- and field-level costs and W&Ts estimate of the portion of its headquarters general and administrative overhead expenses necessary to
operate the properties. Lease and well operating costs are held constant throughout the lives of the properties. Capital costs are included as required for workovers, new development wells, and production equipment. The future capital costs are held
constant to the date of expenditure.

We have made no investigation of potential gas volume and value imbalances resulting from overdelivery
or underdelivery to the W&T interest. Therefore, our estimates of reserves and future revenue do not include adjustments for the settlement of any such imbalances; our projections are based on W&T receiving its net revenue interest share of
estimated future gross gas production after field usage and shrinkage.

The reserves shown in this report are estimates only and should not be
construed as exact quantities. Proved reserves are those quantities of oil and gas which, by analysis of engineering and geoscience data, can be estimated with reasonable certainty to be economically producible. If the reserves are recovered, the
revenues therefrom and the costs related thereto could be more or less than the estimated amounts. Because of governmental policies and uncertainties of supply and demand, the sales rates, prices received for the reserves, and costs incurred in
recovering such reserves may vary from assumptions made while preparing this report. Estimates of reserves may increase or decrease as a result of future operations, market conditions, or changes in regulations.

For the purposes of this report, we used technical and economic data including, but not limited to, well logs, geologic maps, seismic data, well test data,
production data, historical price and cost information, and property ownership interests. The reserves in this report have been estimated using deterministic methods; these estimates have been prepared in accordance with generally accepted petroleum
engineering and evaluation principles. We used standard engineering and geoscience methods, or a combination of methods, such as performance analysis, volumetric analysis, and analogy, that we considered to be appropriate and necessary to establish
reserves quantities and reserves categorization that conform to SEC definitions and guidelines. In evaluating the information at our disposal concerning this report, we have excluded from our consideration all matters as to which the controlling
interpretation may be legal or accounting, rather than engineering and geoscience. As in all aspects of oil and gas evaluation, there are uncertainties inherent in the interpretation of engineering and geoscience data; therefore, our conclusions
necessarily represent only informed professional judgment.



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The titles to the properties have not been examined by Netherland, Sewell & Associates, Inc.
(NSAI), nor has the actual degree or type of interest owned been independently confirmed. The data used in our estimates were obtained from W&T, public data sources, and the nonconfidential files of NSAI and were accepted as accurate. Supporting
geoscience, field performance, and work data are on file in our office. The technical persons responsible for preparing the reserves estimates presented herein meet the requirements regarding qualifications, independence, objectivity, and
confidentiality set forth in the Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information promulgated by the Society of Petroleum Engineers. We are independent petroleum engineers, geologists, geophysicists, and
petrophysicists; we do not own an interest in these properties and are not employed on a contingent basis.



|                              |  |                                             |  |                               |  |                                            |  |                                                  
|----------------------------- |  | ------------------------------------------- |  | ----------------------------- |  | ------------------------------------------ |  | -------------------------------------------------
|                              |  |                                             |  |                               |  | Sincerely,                                
|                              |  |                                             | 
|                              |  |                                             |  |                               |  | NETHERLAND, SEWELL & ASSOCIATES, INC.     
|                              |  |                                             |  |                               |  | Texas Registered Engineering Firm F-002699
|                              |  |                                             |  |                              
|                              |  |                                             |  |                               |  | By:                                        |  | /s/    C.H. (Scott) Rees III                     
|                              |  |                                             |  |                               |  |                                            |  | C.H. (Scott) Rees III, P.E.                      
|                              |  |                                             |  |                               |  |                                            |  | Chairman and Chief Executive Officer             
|                              |  |                                             |  |                              
|By:                           |  | /s/    Thomas M. Souers                     |  |                               |  | By:                                        |  | /s/    Ruurdjan (Rudi) de Zoeten                 
|                              |  | Thomas M. Souers, P.E. 65160 Vice President |  |                               |  |                                            |  | Ruurdjan (Rudi) de Zoeten, P.G. 3179 Geoscientist
|                              |  |                                             |  |                               |  |                                            |  |                                                  
|Date Signed: February 4, 2010 |  |                                             |  | Date Signed: February 4, 2010

TMS:ARS



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