Australian E&P firm, Santos Ltd registered a 13% decline in the first-quarter revenue yesterday due to lower realized prices for oil and gas, but assured about sufficient liquidity and debt headroom to tackle the recent market crash. Santos posted $883 million in revenue from $1.02 billion a year ago. Total production from the firm dropped to 17.9 million barrels of oil equivalent (mmboe), down from 18.4 mmboe last year.