8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported) June 5, 2003

MARKWEST HYDROCARBON, INC.

(Exact name of registrant as specified in its charter)

Delaware	1-11566	84-1352233
(State or other jurisdiction of	(Commission File Number)	(I.R.S. Employer
incorporation or organization)		Identification Number)

155 Inverness Drive West, Suite 200, Englewood, CO	80112-5000
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: 303-290-8700

N/A

(Former name or former address, if changed since last report)

ITEM 5.   OTHER EVENTS AND REQUIRED FD DISCLOSURE

On June 5, 2003, MarkWest Hydrocarbon, Inc. issued the press release announcing that it had entered into a definitive Purchase and Sale Agreement with XTO Energy Inc. relating to the sale of MarkWest Hydrocarbon, Inc.’s San Juan Basin oil and gas properties.  A conformed copy of the press release is filed herewith as Exhibit 99.1 and incorporated herein by reference.

ITEM 7.FINANCIAL STATEMENTS, PROFORMA FINANCIAL INFORMATION AND EXHIBITS

(a) Financial Statements of Businesses Acquired.

N/A

(b) Proforma Financial Information.

N/A

(c) Exhibits.

Exhibit No.	Exhibit Description
99.1	Press Release dated June 5, 2003.

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SIGNATURES

Pursuant to the requirements of the Securities and Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

		MARKWEST HYDROCARBON, INC.
		(Registrant)
Date: June 12, 2003	By	/s/ Donald C. Heppermann
		Donald C. Heppermann,
		Senior Vice President and Chief
		Financial Officer

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EXHIBIT INDEX

Exhibit No.	Exhibit Description
99.1	Press Release dated June 5, 2003.

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EX-99.1

Exhibit 99.1

MARKWEST HYDROCARBON TO SELL ITS SAN JUAN BASIN

OIL AND GAS PROPERTIES FOR $60.5MM

DENVER—June 5, 2003—MarkWest Hydrocarbon, Inc. (AMEX: MWP), today announced that it has entered into a Purchase and Sale Agreement with XTO Energy Inc. (NYSE: XTO) to sell MarkWest’s San Juan Basin oil and gas properties for approximately $60.5 million. The transaction, which involves properties that represent approximately 47 Bcf of proved gas reserves, is effective as of June 1, 2003, and is expected to close by June 30, 2003.

MarkWest previously announced that it had engaged a third party to act as financial advisor to assist in soliciting acquisition proposals for certain oil and gas properties. Petrie Parkman & Co. acted as financial advisor to MarkWest.

The proceeds from the sale will be used to expand MarkWest’s Canadian drilling program, to repay debt outstanding under its existing bank revolving credit facility, and for general corporate purposes.

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MarkWest Hydrocarbon, Inc. (AMEX: MWP), operates in two business segments: exploration and production of natural gas, and midstream services. The exploration and production segment produces natural gas in Alberta, Canada; in the San Juan Basin of Colorado and New Mexico; and in Michigan. In the midstream services segment, which is principally conducted through our 47 percent-owned affiliate, MarkWest Energy Partners, L.P. (AMEX: MWE), we gather natural gas from the wellhead and process the natural gas to remove impurities and the valuable natural gas liquids (NGLs). MarkWest Hydrocarbon markets the NGLs.

This press release includes “forward-looking statements” within the meaning 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 or incorporated herein may constitute forward-looking statements. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we can give no assurance that such expectations will prove to be correct. The forward-looking statements involve risks and uncertainties that affect our operations, financial performance and other factors as discussed in our filings with the Securities and Exchange Commission. Among the factors that could cause results to differ materially are those risks discussed in our Form 10-K for the year ended December 31, 2002, and our Form 10-Q for the period ended March 31, 2003.