* U.S. product inventories rise more than expected for second week
* Oil demand may rise more slowly than expected - Morgan Stanley (N:MS)
* Iran says no request received for emergency OPEC meeting (Changes dateline to NEW YORK, previous LONDON, updates throughout)
By Jessica Resnick-Ault
NEW YORK, Jan 13 (Reuters) - Brent oil prices fell on Wednesday and U.S. crude pared gains after a massive build in U.S. gasoline and diesel inventories fed into bearish sentiment about stagnating demand amid the supply glut that has brought oil prices close to 12-year lows.
Both contracts saw intra-day highs of more than $1 above Tuesday's closing price on upbeat Chinese economic data earlier in the session. 12:35 p.m. EST (1735 GMT), Brent crude LCOc1 was down 32 cents at $30.54 a barrel, while U.S. West Texas Intermediate crude (WTI) CLc1 was up 11 cents at $30.55.
Data showing that crude inventories USOILC=ECI rose 234,000 barrels last week, much less than expectations, was overshadowed by reported builds of 8.4 million barrels in gasoline USOILG=ECI and over 6 million in distillates, which includes diesel and heating oil USOILD=ECI . {EIA/S]
"Overall, it's a bearish report. I think today's inventory report is all about products...The long awaited massive decline in crude production is not starting again," said Dominic Chirichella, senior partner at Energy Management Institute in New York.
This was a second week of huge builds in refined fuel with gasoline surging the most since 1993 in the previous week.
"Last week's build was massive, and this week's was much larger than the seasonal norm," said John Saucer, Vice President at Mobius Risk Group in Houston.
The dynamics of supply have shifted as diesel stockpiles have surged past year-ago levels, indicating a products surplus, Saucer added..
Analysts at Morgan Stanley also warned that a rise in demand for crude could be lower than previously expected.
"Any slowing in the rate of demand growth could delay the timing of rebalancing and ultimately a price recovery," they said in a research note.
The potential for the calling of an emergency OPEC meeting also weakened on Wednesday when Iran's oil minister was quoted as saying he had not received any request for such a gathering.
Nigeria's oil minister said on Tuesday that a "couple" of OPEC members had asked for an emergency meeting. ahead of the expected implementation of a landmark nuclear accord between Tehran and world powers, Iran briefly detained a group of U.S. sailors after they entered Iranian waters.
Iran released the sailors on Wednesday after holding them overnight, determining they had entered Iranian waters by mistake. CHART-Brent oil to drop to $29.85
http://graphics.thomsonreuters.com/US/2/PVB_20161301085035.png CHART-U.S. oil neutral in $30.13-$30.92 range
http://graphics.thomsonreuters.com/US/2/PVB_20161301084133.png
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