I have attached two maps that show where your 160 tract is relative to the Bakken development. The larger the circle - the more oil the well will produce. As you can see, you are not located in the best of areas for the Bakken.
The wells in your immediate area will produce between 150,000 and 250,000 bbls of oil. At current oil prices, those wells would be uneconomic to drill. Someone is probably trying to lease you up hoping that oil prices will rise enough to make these worth drilling.
Rather than focus on the upfront bonus of $650 x 160 = $56,000, try to get a well drilled. Your share of a 250,000 bbl well would be 160/1280 x 20% = 2.5%. That's 6,250 bbls to your share, or over $300,000 at $50/bbl.