It all depends what area you're drilling in..for example a vertical well in the Surat may cost around $500k, but a double lateral in the Bowen would cost around $2m...
Gas flows from each well are also extremely variable...
I think $1.5m is overstating the cost of a vertical well, particularly in the good areas in the Surat...
Most CSG companies (e.g. QGC, SHG, AOE, ORG) have stated the costs of a well in past announcements, just have a look around.
AOE Price at posting:
$3.92 Sentiment: LT Buy Disclosure: Not Held