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Foreland strata accretion into the developing thrustbelt taper accelerated sediment transport from the emergent portion of the orogen undergoing mountain building control a relatively rapid burial of the proximal portion of the foreland basin. They are the most prominent factors affecting the expulsion timing from the organic rich strata residing under and inside the foreland basin fill.
If the contraction driving the thrustbelt and foreland basin development is orthogonal to thrustbelt and basin axes, hydrocarbon expulsion from source rocks of the same stratigraphic age is more-or-less synchronous along strike. However, the timing can quickly gain more complex character if the contraction is either oblique to the axis of linear thrustbelt-foreland basin system or fanning inside of salients and reentrants of the curved thrustbelt-foreland basin system.