Oct 7 (Reuters) - The discount on Western Canada Select

(WCS) heavy crude versus the North American benchmark West Texas

Intermediate (WTI) tightened on Monday:

* WCS for November delivery in Hardisty, Alberta, firmed on

Monday, trading at a low of minus $12.20 versus WTI, but

climbing to a $11.75 a barrel discount, according to brokerage

CalRock. It settled at $12.20 a barrel under the benchmark on

Friday.

* Oil futures rose by 3% on Monday, with Brent surpassing

$80 a barrel as conflict in the Middle East escalated. Brent

futures settled at $80.93 a barrel, while West Texas

Intermediate settled at $77.14 a barrel.

* Chevron ( CVX ) said on Monday it would sell its Athabasca

oil sands and Duvernay shale assets to Canadian Natural

Resources for $6.5 billion. The sale puts into motion Chevron's ( CVX )

plan to raise $10 billion to $15 billion through asset sales.