Sometimes they just fail to reset properly. Nothing to worry about. The youtube video shows the procedure to reset for a Chevy Truck, should be the same for your Chevy car.
Here's a website with explanation.
https://www.quora.com/What-does-it-mean-if-the-change-oil-light-is-lit-after-an-oil-change
Not only does this YouTube video show the location of the oil filter on a 2001 Chevrolet Blazer, but it also claims that an entire oil change can easily be done by an average individual with a few common tools.
The oil filter is place underneath a flap on an easily-serviceable part of the car.
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