The Shale act allowed for the multi-unit drilling of the shales in order to save money by drilling one long well across one or more sections instead of two shorter wells-one in each section and having to abide by the easements on the edges of the sections and not draining them. That is why they mention the “unconventional”. Recently, the legislature also approved long laterals for conventional reservoirs. When they use “unconventional” pretty much means the tight shales or tight limestones.