Yes. That is beginning to surface (pun intended).
I don't know for sure. I guess it is easier to find shale and where there is shale there is gas.
They drill many wells, 20 or so, from one drillsite. They go off laterally in all directions.
If I find an article I will post the link here.
ok...i think i know what your information is intending to say.
i'll throw in my 2 cents, and you can take it or leave it.
no more dry holes. to me, a dry hole can show a resource, but if it is not economic, it is of no use, and therefore a dry hole. an example of this can be a well drilled expecting 100' of reservoir, but only finding 10'. There is still a resource, but it is not worth the money to continue with the completion of the well. I imagine the same is true with shale gas (the little i know about it). not all shales have gas. the primary target are shales known as source rock, which typically provide the hydrocarbons to the conventional reservoirs. further complicating things, water is almost always produced with oil and nat gas. as the wikipedia article points out, shales have very little permeability. but, with the mobilization of some in-situ water, some shales (such as illite and smectite) swell with water, decreasing permeability even further.
lower drilling costs - the idea (and i spoke with a horizontal drilling expert in my group who just attended a shale gas conference, also is mentioned in wikipedia) is to maximize the contact of the "Reservoir" to the wellbore. petroleum engineers typically speak in terms of flow capacity (permeability*height). since shales have virtually no permeability, the only other option is to increase the effective height by drilling horizontal. drilling from pads has been going on for at least a decade and is more or less the norm now, especially in the states. pad drilling can be much more efficient in terms of total operations, but also increases costs in other areas (such as direction drilling systems). especially when you start to talk about long horizontals which can require pilot holes to be drilled. the idea of pad drilling is to keep from having to move the rig miles for each well, instead you can move it 10'. and it keeps the environmental impact down.
my take...dry holes (or not economic holes) will occur with shale gas, they are not risk free. additional work in understanding petroleum systems will need to take place before development. drilling is likely to be more expensive than conventional plays, laying a long horizontal is not common practice nor is it easy. technological advances that can help shale gas plays - geo steering, control of hydraulic fracturing (limited entry, real time monitoring).
random comments - the horizontal drilling guy in my group that i spoke with said the shale gas conference was the first conference he ever attended that was a constant sales pitch to sign up for and pay for newsletters (the guys putting on the conference were trying to sell something other than shale gas). i don't feel the current nat gas price will support shale gas developments, as anything under $6/mcf had marginal economics in the piceance (current prices today definitely are not economic to most in the piceance, as most rigs have been pulled out of the area).