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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

Form 10-Q

For the quarterly period ended June 30, 2008

OR

For the transition period from              to             

Commission File Number 1-32414

W&T OFFSHORE, INC.

(Exact name of registrant as specified in its charter)

(713) 626-8525

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company.    Yes  ¨    No  x

As of August 6, 2008, there were 76,354,836 shares outstanding of the registrant’s common stock, par value $0.00001.

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W&T OFFSHORE, INC. AND SUBSIDIARIES

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PART I – FINANCIAL INFORMATION

W&T OFFSHORE, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

See Notes to Condensed Consolidated Financial Statements.

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W&T OFFSHORE, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

See Notes to Condensed Consolidated Financial Statements.

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W&T OFFSHORE, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS’ EQUITY

See Notes to Condensed Consolidated Financial Statements.

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W&T OFFSHORE, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

See Notes to Condensed Consolidated Financial Statements.

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W&T OFFSHORE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Basis of Presentation

Operations. W&T Offshore, Inc. and subsidiaries, referred to herein as “W&T” or the “Company,” is an independent oil and natural gas producer, active in the acquisition, exploitation, exploration and development of oil and natural gas properties in the Gulf of Mexico.

Interim Financial Statements. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles (“GAAP”) for interim financial information and the appropriate rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, the condensed consolidated financial statements do not include all of the information and footnote disclosures required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for interim periods are not necessarily indicative of the results that may be expected for the entire year. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s annual report on Form 10-K for the year ended December 31, 2007.

Reclassifications. Certain reclassifications have been made to prior periods’ financial statements to conform to the current presentation.

Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.

2. Recent Accounting Pronouncements

Effective January 1, 2008, the Company adopted Statement of Financial Accounting Standards (“SFAS”) No. 157, Fair Value Measurements, on a prospective basis. SFAS No. 157 establishes a framework for measuring fair value under GAAP, clarifies the definition of fair value within that framework, and expands disclosures about the use of fair value measurements. For additional information about the impact of the adoption of SFAS No. 157 on our financial statements, refer to Note 5.

Effective January 1, 2008, the Company adopted SFAS No. 159, The Fair Value Option for Financial Assets and Financial Liabilities—Including an amendment of FASB Statement No. 115. This statement permits entities to choose to measure many financial instruments and certain other items at fair value that are not currently required to be measured at fair value. The adoption of SFAS No. 159 did not have an impact on the Company’s financial position, results of operations or cash flows as the Company elected not to measure any additional financial assets and liabilities at fair value that were not already required to be measured at fair value.

In June 2008, the Financial Accounting Standards Board (“FASB”) issued FASB Staff Position (“FSP”) No. Emerging Issues Task Force (“EITF”) 03-6-1 (“FSP 03-6-1”), Determining Whether Instruments Granted in Share-Based Payment Transactions Are Participating Securities. This FSP provides that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of earnings per share under the two-class method described in SFAS No. 128, Earnings Per Share. FSP 03-6-1 is effective for financial statements issued for fiscal years and interim periods beginning after December 15, 2008, and will require all earnings per share data presented for prior-periods to be restated retrospectively. We currently do not anticipate that FSP 03-6-1 will have a material impact on our earnings per share data for fiscal year 2009 or on earnings per share data for any prior periods presented.

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W&T OFFSHORE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

(Unaudited)

In March 2008, the FASB issued SFAS No. 161, Disclosures about Derivative Instruments and Hedging Activities—an amendment of FASB Statement No. 133. SFAS No. 161 changes the disclosure requirements for derivative instruments and hedging activities. Entities are required to provide enhanced disclosures about (a) how and why an entity uses derivative instruments; (b) how derivative instruments and related hedged items are accounted for under SFAS No. 133, as amended; and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance and cash flows. SFAS No. 161 is effective for financial statements issued for fiscal years and interim periods beginning after November 15, 2008. The adoption of SFAS No. 161 will not have an impact on the Company’s financial position, results of operations or cash flows.

In December 2007, the FASB issued SFAS No. 141 (revised 2007) (“SFAS No. 141(R)”), Business Combinations. SFAS No. 141(R) requires the acquiring entity in a business combination to recognize the assets acquired, the liabilities assumed and any noncontrolling interest in the acquiree to be measured at their respective fair values at the acquisition date. Acquisition-related costs incurred prior to the acquisition are required to be expensed rather than included in the purchase-price determination. SFAS No. 141(R) also provides guidance for recognizing and measuring the goodwill acquired in a business combination and determines what information to disclose to enable users of the financial statements to evaluate the nature and financial effects of the business combination. The statement applies prospectively to business combinations for which the acquisition date is on or after January 1, 2009. We expect SFAS No. 141(R) will have an impact on our consolidated financial statements when effective, but the nature and magnitude of the specific effects will depend upon the nature, terms and size of acquisitions, if any, that we may consummate subsequent to the effective date of the new standard.

3. Asset Retirement Obligations

Our asset retirement obligations primarily represent the estimated present value of the amount we will incur to plug, abandon and remediate our producing properties at the end of their productive lives in accordance with applicable laws. During the six months ended June 30, 2008, the Company revised, among other things, its estimate of the cost to decommission its sub-sea wells and made other changes to the estimated timing and amounts of settlements. A summary of our asset retirement obligations is as follows (in thousands):

4. Long-Term Debt

As of June 30, 2008 and December 31, 2007, our long-term debt was as follows (in thousands):

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W&T OFFSHORE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

(Unaudited)

At June 30, 2008 and December 31, 2007, we had no amounts outstanding and had $500.0 million of undrawn capacity available under our committed revolving loan facility under the Third Amended and Restated Credit Agreement, as amended (the “Credit Agreement”).

Borrowings under the Tranche B term loan facility under the Credit Agreement bear interest at either (1) the higher of the Prime Rate, or the Federal Funds Rate plus 0.50%, plus a margin equal to 1.25% or (2) to the extent the loan outstanding is designated as a Eurodollar loan, at the London Interbank Offered Rate (“LIBOR”) plus a margin equal to 2.25%. The effective interest rate, including amortization of the discount, on the Tranche B term loan facility was 6.8% during the six months ended June 30, 2008.

The Senior notes (the “Notes”) bear interest at a fixed rate of 8.25%, with interest payable semi-annually in arrears on June 15 and December 15. The estimated annual effective interest rate on the Notes is 8.4%.

Under the Credit Agreement, we are subject to various financial covenants calculated as of the last day of each fiscal quarter, including a current ratio, interest coverage ratio, asset coverage ratio and a leverage ratio. We were in compliance with all applicable covenants of the Credit Agreement as of June 30, 2008.

On July 24, 2008, we amended the Credit Agreement to extend the maturity of the revolving loan facility to July 23, 2012 and increase the interest margin by 0.125% across the entire pricing grid of borrowings under the revolving loan facility. Certain other amendments were made to the Credit Agreement which changed or eliminated various covenants, including increasing the amount available for distribution or share repurchases to $60.0 million per year from $30.0 million per year.

5. Fair Value Measurements

Effective January 1, 2008, the Company adopted SFAS No. 157, Fair Value Measurements, on a prospective basis. SFAS No. 157 establishes a framework for measuring fair value under GAAP, clarifies the definition of fair value within that framework, and expands disclosures about the use of fair value measurements. This statement applies to all existing pronouncements under GAAP that require (or permit) the use of fair value, with the exception of SFAS No. 123 (revised 2004) (“SFAS No. 123(R)”), Share-Based Payment. SFAS No. 157 does not require any new fair value measurements under GAAP. In February 2008, the FASB granted a one-year deferral of SFAS No. 157 for certain non-financial assets and liabilities, including asset retirement obligations initially measured at fair value under SFAS No. 143, Accounting for Asset Retirement Obligations.

Under SFAS No. 157, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value of an asset should reflect its highest and best use by market participants, whether using an in-use or an in-exchange valuation premise. The fair value of a liability should reflect the risk of nonperformance, which includes, among other things, the Company’s credit risk.

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W&T OFFSHORE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

(Unaudited)

Valuation techniques are generally classified into three categories: the market approach; the income approach; and the cost approach. The selection and application of one or more of these techniques requires significant judgment and is primarily dependent upon the characteristics of the asset or liability, the principal (or most advantageous) market in which participants would transact for the asset or liability and the quality and availability of inputs. Inputs to valuation techniques are classified as either observable or unobservable within the following hierarchy:

At June 30, 2008, the only items on our balance sheet to which SFAS No. 157 applies are our derivatives. We measure the fair value of our derivatives by applying the income approach. Our derivatives are classified within level 2 of the valuation hierarchy and the total fair value of our derivative liabilities was $39.0 million at June 30, 2008. The impact of the adoption of SFAS No. 157 on our financial position and results of operations was immaterial. For additional details about our derivatives and their fair values at June 30, 2008, refer to Note 6.

6. Derivative Financial Instruments

We account for our derivative contracts in accordance with SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities, as amended. SFAS No. 133 requires each derivative to be recorded on the balance sheet as an asset or a liability at its fair value. Additionally, the statement requires that changes in a derivative’s fair value be recognized currently in earnings unless specific hedge accounting criteria are met at the time the derivative contract is entered into. Our derivative contracts expose the Company to credit loss in the event of nonperformance by the counterparty; however, we currently do not anticipate nonperformance by the counterparty.

Commodity Derivatives. In January 2006, we entered into commodity swap and option contracts in connection with the anticipated financing related to the acquisition by merger of a wholly-owned subsidiary of Kerr-McGee Oil & Gas Corporation (“Kerr-McGee”). While these contracts were intended to reduce the effects of volatile oil and natural gas prices, they may also limit future income from favorable price movements. Changes in the fair value of our commodity derivative contracts are recognized currently in earnings.

During the three months ended June 30, 2008 and 2007, we recorded unrealized losses of $14.4 million and $0.9 million, respectively, related to our open commodity derivative contracts, and we recorded a realized loss of $12.6 million and a realized gain of $0.8 million, respectively, related to settlements of our commodity derivatives.

During the six months ended June 30, 2008 and 2007, we recorded unrealized losses of $16.7 million and $14.8 million, respectively, related to our open commodity derivative contracts, and we recorded a realized loss of $18.6 million and a realized gain of $2.7 million, respectively, related to settlements of our commodity derivatives. At June 30, 2008, $34.1 million was included in accrued liabilities related to our open commodity derivatives.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

(Unaudited)

As of June 30, 2008, our open commodity derivatives were as follows:

As of December 31, 2007, our open commodity derivatives were as follows:

Interest Rate Swap. On January 23, 2008, we re-designated 100% of the notional amount of our interest rate swap as a cash flow hedge under SFAS No. 133. On March 31, 2008, we elected to discontinue hedge accounting for our interest rate swap. Subsequent to March 31, 2008, changes in the fair value of our interest rate swap have been and will continue to be immediately recognized in earnings.

During the three and six months ended June 30, 2008, we recorded unrealized gains of $4.2 million and $0.3 million, respectively, and realized losses of $1.0 million and $1.1 million, respectively, in earnings related to our interest rate swap. During the three and six months ended June 30, 2007, we recorded an unrealized loss of $0.2 million related to our interest rate swap.

At June 30, 2008, the fair value of our interest rate swap was $4.9 million, of which $2.8 million was included in accrued liabilities and $2.1 million was included in other liabilities. The amount in accumulated other comprehensive loss of approximately $1.0 million (net of tax) related to our interest rate swap will be recognized in earnings over the remaining term of the swap in accordance with SFAS No. 133.

7. Long-Term Incentive Compensation

2007 Bonus. In February 2008, our board of directors approved payment of a general bonus for 2007 in accordance with the W&T Offshore, Inc. 2005 Annual Incentive Plan (as amended, the “Plan”), consisting of cash and restricted stock.

Cash bonuses for 2007 were paid in March 2008 and totaled $4.5 million. Of this amount, $3.5 million was expensed in 2007, $0.6 million was expensed in the first quarter of 2008 and the remainder was billed to partners under joint operating agreements.

The restricted stock portion of the 2007 bonus was settled in March 2008 by the granting and issuing of 196,112 restricted shares of our common stock with a fair value of approximately $6.3 million. The associated compensation expense, less an allowance for estimated forfeitures, is being recognized over the requisite service period of four years beginning on the first day of the bonus year. Accrued liability amounts of approximately $1.6 million ($1.4 million at December 31, 2007) related to the recognition of compensation expense during the service period prior to the issuance of the restricted shares were reclassified to additional paid-in capital upon issuance of the restricted shares in March 2008 (see Note 8).

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

(Unaudited)

2008 Bonus. Eligible employees will be entitled to receive a bonus for 2008 in accordance with the Plan, consisting of cash and restricted stock. Shares of restricted stock to be awarded as a bonus for 2008 will be issued in 2009 and have a four year requisite service period beginning January 1, 2008 and will vest in three equal installments on December 31, 2009, 2010 and 2011. The cash bonus for 2008 will be paid in 2009. During the three months ended June 30, 2008, we expensed $1.8 million related to the general bonus for 2008, of which $0.6 million will ultimately be settled in restricted shares. During the six months ended June 30, 2008, we expensed $3.6 million related to the general bonus for 2008, of which $1.1 million will ultimately be settled in restricted shares (see Note 8).

8. Share-Based Compensation

We recognize compensation cost for share-based payments to employees and non-employee directors over the period during which the recipient is required to provide service in exchange for the award, based on the fair value of the equity instrument on the date of grant. At June 30, 2008, there were 1,703,355 shares of common stock available for award under our share-based payment plans. A summary of share activity pursuant to our share-based payment plans for the six months ended June 30, 2008, is as follows:

During the six months ended June 30, 2008, a total of 196,112 restricted shares of our common stock were granted to employees pursuant to our share-based payment plans. With certain exceptions, these shares will vest in three equal installments with the first such installment vesting on December 31, 2008, and the remainder, less any forfeited shares, vesting on December 31, 2009 and 2010. During the six months ended June 30, 2008, 10,941 restricted shares held by two former employees were vested upon termination of their employment.

Also during the six months ended June 30, 2008, our non-employee directors have been granted a total of 8,027 restricted shares of our common stock. With certain exceptions, shares granted to our non-employee directors vest in three equal installments on the first, second and third anniversaries from the date of grant. During the six months ended June 30, 2008, 4,243 restricted shares held by our non-employee directors vested.

The weighted average grant date fair value of restricted shares granted during the six months ended June 30, 2008 and 2007 was $6.6 million and $9.4 million, respectively. The weighted average fair value of the shares that vested during the six months ended June 30, 2008 and 2007 was $0.6 million and less than $0.1 million, respectively, based on the closing prices on the dates of vesting.

During the three months ended June 30, 2008 and 2007, total compensation expense under share-based payment arrangements was $2.0 million and $1.2 million, respectively. During the six months ended June 30, 2008 and 2007, total compensation expense under share-based payment arrangements was $4.2 million and $2.4 million, respectively. As of June 30, 2008, there was $8.3 million of total unrecognized share-based compensation expense related to restricted shares issued. Such amount is expected to be recognized in the period beginning July 2008 and ending April 2011.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

(Unaudited)

9. Earnings Per Share

Basic earnings per share was calculated by dividing net income applicable to common shares by the weighted average number of common shares outstanding during the periods presented. Diluted earnings per share incorporates the potential dilutive impact of nonvested restricted stock outstanding during the periods presented.

The reconciliation of basic and diluted weighted average shares outstanding and earnings per share is as follows (in thousands, except per share amounts):

10. Comprehensive Income

Our comprehensive income for the periods indicated is as follows (in thousands):

11. Dividends

During the six months ended June 30, 2008, we paid regular cash dividends of $0.03 per common share per quarter and a special cash dividend of $30.0 million, or approximately $0.39 per common share. During the six months ended June 30, 2007, we paid regular cash dividends of $0.03 per common share per quarter. On May 5, 2008, our board of directors declared a cash dividend of $0.03 per common share, which was paid on July 1, 2008 to shareholders of record on May 20, 2008.

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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS – (Continued)

(Unaudited)

12. Contingencies

We are a party to various pending or threatened claims and complaints seeking damages or other remedies concerning our commercial operations and other matters in the ordinary course of our business. Some of these claims relate to matters occurring prior to our acquisition of properties and some relate to properties we have sold. In certain cases, we are entitled to indemnification from the sellers of properties and in other cases, we have indemnified the buyers to whom we have sold properties. Although we can give no assurance about the outcome of pending legal and administrative proceedings and the effect such an outcome may have on us, management believes that any ultimate liability resulting from the outcome of such proceedings, to the extent not otherwise provided for or covered by insurance, will not have a material adverse effect on our consolidated financial position, results of operations or liquidity.

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Forward-Looking Statements

The following discussion and analysis should be read in conjunction with our accompanying unaudited condensed consolidated financial statements and the notes to those financial statements included in Item 1. of this Quarterly Report on Form 10-Q. The following discussion contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1933 and Section 21E of the Securities and Exchange Act of 1934 that involve risks, uncertainties and assumptions. If the risks or uncertainties materialize or the assumptions prove incorrect, our results may differ materially from those expressed or implied by such forward-looking statements and assumptions. All statements other than statements of historical fact are statements that could be deemed forward-looking statements, such as those statements that address activities, events or developments that we expect, believe or anticipate will or may occur in the future. These statements are based on certain assumptions and analyses made by us in light of our experience and perception of historical trends, current conditions, expected future developments and other factors we believe are appropriate in the circumstances. Certain factors that may affect our financial condition and results of operations are discussed in Item 1A. “Risk Factors” and Item 7A. “Quantitative and Qualitative Disclosures About Market Risk” of our Annual Report on Form 10-K for the year ended December 31, 2007 and may be discussed or updated from time to time in subsequent reports filed with the SEC. We assume no obligation, nor do we intend, to update these forward-looking statements. Unless the context requires otherwise, references in this Quarterly Report on Form 10-Q to “W&T,” “we,” “us,” “our” and the “Company” refer to W&T Offshore, Inc. and its consolidated subsidiaries.

Overview

W&T is an independent oil and natural gas producer focused in the Gulf of Mexico. W&T has grown through acquisitions, exploitation and exploration and currently holds working interests in approximately 155 producing fields in federal and state waters. The majority of our daily production is derived from wells we operate.

Results of Operations

The following tables set forth selected financial and operating data for the periods indicated (all values are net to our interest unless indicated otherwise):

See footnotes beginning on page 14.

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