Oct 21 (Reuters) - Santos Ltd STO.AX
* Qtrly sales 21.3 mmboe versus 16.2 mmboe a year ago
* Qtrly production 15.5 mmboe versus 14.5 mmboe a year ago
* 2016 production guidance is narrowed to 60 to 62 mmboe and sales volumes are expected to be between 81 and 83 mmboe
* For 2016, upstream production cost guidance is lowered to us$9-9.50/boe produced, capital expenditure guidance is reduced to US$700 million
* Qtrly sales revenue $650 million versus $585 million Source text for Eikon: ID:nASX1bb00Z Further company coverage: STO.AX
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