Changes

===The Paleozoic petroleum system===

===The Paleozoic petroleum system===

The Paleozoic petroleum system provides an example of a complex system involving long range migrations from Llandoverian source rocks and the formation of large accumulations of oil and gas on regional highs occurring long before the formation of the Zagros folds, and the late re-accommodation of part of the gas in anticlines that resulted from the Late Miocene to Pliocene orogeny.<ref name=Bordenave_2008>Bordenave, M. L., 2008, [http://onlinelibrary.wiley.com/doi/10.1111/j.1747-5457.2008.00405.x/abstract The origin of the Permo-Triassic gas accumulations in the Iranian Zagros Foldbelt and contiguous offshore areas: A review of the Paleozoic petroleum system]: Journal of Petroleum Geology, v. 31, no. 1, p. 3–42.</ref>

The Paleozoic petroleum system provides an example of a complex system involving long range migrations from Llandoverian source rocks and the formation of large accumulations of oil and gas on regional highs occurring long before the formation of the Zagros folds, and the late re-accommodation of part of the gas in anticlines that resulted from the Late Miocene to Pliocene [[orogeny]].<ref name=Bordenave_2008>Bordenave, M. L., 2008, [http://onlinelibrary.wiley.com/doi/10.1111/j.1747-5457.2008.00405.x/abstract The origin of the Permo-Triassic gas accumulations in the Iranian Zagros Foldbelt and contiguous offshore areas: A review of the Paleozoic petroleum system]: Journal of Petroleum Geology, v. 31, no. 1, p. 3–42.</ref>

The older sediments known in the Zagros foldbelt and offshore are the thick [[halite]] of the Hormuz Formation that formed early deep-seated salt-pillows and salt-plugs. These are overlain by Cambro-Ordovician fluviatile reddish cross-bedded sandstone and mud-stone, shallow marine [[shale]] and [[dolomite]], generally organic-lean, which outcrop at the base of the High Zagros thrusts.<ref name=Setudehnia_1976 /> Ordovician sediments also outcrop at Kuh-e Surmeh in Central Fars ([[:file:M106Ch14Fig07.jpg|Figure 4]]).

The older sediments known in the Zagros foldbelt and offshore are the thick [[halite]] of the Hormuz Formation that formed early deep-seated salt-pillows and salt-plugs. These are overlain by Cambro-Ordovician fluviatile reddish cross-bedded sandstone and mud-stone, shallow marine [[shale]] and [[dolomite]], generally organic-lean, which outcrop at the base of the High Zagros thrusts.<ref name=Setudehnia_1976 /> Ordovician sediments also outcrop at Kuh-e Surmeh in Central Fars ([[:file:M106Ch14Fig07.jpg|Figure 4]]).