We are currently researching a business opportunity which would
involve buying some oil and gas assets in the N.American market  (US
and Canada). To be more spesific; I am looking for data on production
leases only, not exploration leases. 
The info I would like to get hold of is how many transactions between
buyers and sellers takes place per year in this market, and what the
average transaction price is. Also, if possible I would like to know
how this market has developed over time  (ie. the last 5 years).

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Clarification of Question by helge-ga on 11 Sep 2005 10:06 PDT

Also, I'm only looking for data for onshore leases (not offshore).