BUZZ-Oil and gas companies: Oil prices bounce back to $56
** U.S.-listed oil and gas companies' shares up 5-8 pct
** Oil prices rebounded more than $1 to $56 a barrel as a weakened dollar and industry spending cuts offset worries of a supply glut
** SandRidge Energy Inc up 7.4 pct at $2.04, North Atlantic Drilling Ltd up 8.9 pct at $2.21, Penn West Petroleum Ltd up 8.1 pct at $2.55, C&J Energy Services Inc up 6.6 pct at $12.22, Basic Energy Services Inc up 5.5 pct at $7.11 , Goodrich Petroleum Corp up 4 pct at $3.2, EP Energy Corp up 7 pct at $12.72
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