Oct 3 (Reuters) - The discount on Western Canada Select

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

Intermediate (WTI) edged tighter on Thursday:

* WCS for November delivery in Hardisty, Alberta, settled at

$12.75 a barrel below WTI, according to brokerage CalRock,

having settled at $12.85 a barrel under the benchmark on

Wednesday.

* The Canadian heavy crude market has been very active with

strong trade volumes, but remains rangebound, one Calgary-based

broker said.

* Global oil prices surged as concerns mounted that a

widening regional conflict in the Middle East could disrupt

international crude flows.