Early generation concentrates light products into large [[Pore system fundamentals|pores]] and [[fracture networks]]. Thus, the oil expelled is lighter in [[Oil and condensate analysis|composition]] than the oil retained. However, as maturity continues, the difference between these two disappears and [[Oil-oil and oil-source rock correlation|oil–source correlation]] improves.
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Early [[Petroleum generation|generation]] concentrates light products into large [[Pore system fundamentals|pores]] and [[fracture networks]]. Thus, the oil expelled is lighter in [[Oil and condensate analysis|composition]] than the oil retained. However, as maturity continues, the difference between these two disappears and [[Oil-oil and oil-source rock correlation|oil–source correlation]] improves.