By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- European stocks fell Friday, with oil stocks hit hard in the wake of a decision by the Organization of the Petroleum Exporting Countries not to cut its oil-production target.

Investors also assessed a fresh round of economic data from Germany, France and Italy ahead of the release of key eurozone inflation at 10 a.m. London time, or 5 a.m. Eastern Time. Read: These 5 charts show how much Europe needs QE.

The Stoxx Europe 600 index fell 0.5% to 345.80 as the oil and gas group lost 4.1%. The slide was triggered after OPEC on Thursday held to its production target of 30 million barrels a day, disappointing those investors who had been looking for the cartel to reduce output, in an effort to stop a recent drop in global oil prices.

U.S. crude-oil futures on Friday (CLF5) fell nearly 7% to trade below $69 a barrel, and Brent crude futures lost 1.1% to $71.77 a barrel.

Shares of energy-engineering company Weir Group PLC were the worst performing on the Stoxx 600 as they were yanked 8% lower. Oil producer BG Group PLC gave up 7.6%, and Tullow Oil PLC fell 5.2%.

   Also, Total SA  fell 3.8%, Royal Dutch Shell PLC  was down  3.3% and BP PLC   fell 3.1%. 

On Thursday, European Central Bank President Mario Draghi in Helsinki said policy makers expect the recent slide in oil prices to contribute to keeping inflation "at around current low levels over the coming months, before increasing gradually during 2015 and 2016."

Eurozone-wide inflation data are expected to show consumer prices grew by 0.3% this month.

The Stoxx 600 was in line for a 3% rise for the month, and a 0.4% gain for the week.

On the currency market, the Russian ruble (USDRUB) fell to new lows Friday following OPEC's production decision, as Russia takes in roughly 50% of its revenue from exporting oil and gas. The dollar was buying 49.727 rubles compared with 48.795 rubles late Thursday.

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