BUZZ-Oil and gas companies: Oil prices rise
** Oil and gas companies' U.S.-listed shares up
** Oil prices rise in response to weaker dollar and expectations that OPEC producers will maintain their group production target at current level and resist pressure for increase
** Brent crude up 15 cents at $65.03 per barrel as of 1330 GMT; U.S. crude up 40 cents at $60.60 per barrel
** PostRock Energy Corp up 8.5 pct at $3.85; Penn West Petroleum Ltd up 5 pct at $2.10; Penn Virginia Corp up 5.7 pct at $4.85
** Seadrill Ltd up 5.6 at $12.53; Hercules Offshore Inc up 7.9 pct at 70 cents
** Key Energy Services Inc up 4 pct at $2.29; Basic Energy Services Inc up 5 pct at $9.02
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