TOKYO, May 12 (Reuters) - Oil prices rose on Friday, and were set to end the week flat after three weeks of decline, as the market balanced supply fears against renewed economic concerns in the United States and China. Analysts forecast an emerging supply deficit for the second half of the year, even as Iraq's oil minister Hayan Abdel-Ghani told Reuters on Friday he does not expect OPEC+ to decide on further production cuts when it next meets in Vienna on June 4. See here for a complete list of exchanges and delays