MAIN FACTS:
-Shell received an unsolicited offer from Plains Exploration for Shell's working interest.
-The transaction is effective Oct. 1, and is expected to close by year-end 2012.
-The company recently noted three successful appraisal wells at the Appomattox and Vito fields, which are expected to begin producing in the second half of the decade.
-Royal Dutch Shell class A-shares at 1140 GMT down 2.0 pence, or 0.1%, at GBP22.29, valuing the company at GBP82.79 billion.
-Write to Razak Musah Baba at razak.baba@dowjones.com
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