Abstract
The Guri Limestone Member of the Mishan Formation of Early to Middle Miocene age produces gas in the SE portion of the Zagros geosyncline. The Mishan Formation, which is predominantly marl in its type section near Khuzestan Province, becomes more argillaceous with an increase in organic content towards the SE where the sequence thickens. In the SE portion of the Zagros geosyncline, the lower part of the Mishan changes to a highly‐resistant, fossilqerous limestone which is called the Guri Limestone. This is of Late‐Early Miocene age in most of the SE Zagros and rises in stratigraphic position towards the NW, becoming of Middle Miocene age in Khuzestan Province. The Guri thickens considerably with massive reefal‐type deposits towards the eastern end of the Fars Province near the Oman high.Lithological and geochemical studies support the hypothesis that the Mishan Formation could serve as a source rock for the hydrocarbons which have been found within the Guri. However, subsidence has failed to place the Mishan Formation within the thermal zone thought to be necessary for liquid hydrocarbon formation, and it is more likely that the deposits will produce gas.
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