Just search "oil generation" or "petroleum generation", there should be plenty of internet articles discussing that. Temperature-wise, the "cooking" range for oil (oil window) is 50-150 deg C, and gas window is 150-200 deg C. Some articles:

https://en.wikipedia.org/wiki/Kerogen

http://large.stanford.edu/courses/2013/ph240/malyshev2/

or, any book on "petroleum geology" should have a chapter on the generation/formation of petroleum. One such book is "Element of Petroleum Geology" https://www.sciencedirect.com/book/9780128223161/elements-of-petroleum-geology

The best conditions for the formation of oil and gas are the presence of a suitable hydrocarbon system, including source rock, reservoir rock, and cap rock.