______________Investing in Oil and Gas Wells

SYDNEY (Reuters) - Oil fell on Monday, extending the past three sessions' decline, as the growing threat of a U.S. economic downturn outweighed supply worries in Iran and Nigeria. ADVERTISEMENT U.S. light crude for February delivery fell 23 cents to $92.46 a barrel by 0106 GMT. U.S oil settled down $1.02 at $92.69 a barrel on Friday, dragged down by fears of a potential U.S. economic recession. "There was some bullish news out of Iran and Nigeria that could have pushed up oil prices, but Asian markets are focusing on the health of U.S. economy for now," said Gerard Burg, a resource analyst at National Bank of Australia (NAB) in Melbourne.