DUBAI, **v 18 (Reuters) - OPEC heavyweight Saudi Arabia's crude oil exports edged up in September by around 59,000 barrels per day (bpd) while volumes used by domestic refineries remained high, official data showed on Tuesday. The world's top oil exporter shipped 6.722 million bpd of crude in September, up from 6.663 million in August but lower than July's 6.989 million, data published by the Joint Organisations Data Initiative (JODI) showed. Production rose to 9.704 million in September from 9.597 million in August but was lower than July's 10.005 million, the data showed. ...