LONDON, March 31 (Reuters) - A drop in refining demand has
left a large number of Nigerian crude cargoes for April
overhanging the market.
* More than 20 cargoes of April loading Nigerian were still
available even though May trading should be full in swing.
* Angola's state firm Sonangol was still offering Cabinda,
CLOV, Dalia and Girassol.
* A rift in the Organization of the Petroleum Exporting
Countries (OPEC) has widened after members failed to agree
unanimously on an emergency low-level meeting to discuss a
market collapse that has seen global oil prices hit 18-year
lows. * Oil traders across the world are offering cargoes far in
advance as rapidly vanishing demand drives key physical crude
prices to multi-decade lows, with some U.S. oil valued at
roughly $10 a barrel and other grades even lower.