A cool interactive website by Enno Peters, Visualizing US shale oil & gas production, allows a user to visualize shale play production statistics, including the Niobrara, in many interesting ways. You can view production/decline curves by formation/member, by year, by county, and even by specific well.
This interactive presentation contains the latest oil & gas production data from all 6855 horizontal wells that started production in the Niobrara region (Colorado & Wyoming) since 2009/2010, through August 2017 (as of this posting).
The interactivity of this site is truly amazing and allows one to slice and dice oil and gas production data as far as you want. It was interesting to view how much production has improved in the Niobrara since the play was started in the 2009 time frame. This site is definitely worth a look!