The Middle-Late Ordovician carbonate platform margin in Tarim basin can be divided into 4 types

including low energy

relatively low energy

relatively high energy

and high energy types.Different organic reef-bank complexes have been developed in different platform margin types.1)The low energy type carbonate platform margin can be represented by lime mud mound-muddy bank complex in Tazhong I faulted zone which have been developed during the early-stage deposition of the Upper Ordovician Lianglitage Formation.2)The relatively low energy type carbonate platform margin can be represented by the barrier reef-lime mud bank complex in Bachu outcrop area which have been developed during the deposition of Middle Ordovician Yijianfang Formation(Dawangou Formation).3)The relatively high energy type carbonate platform margin can be represented by the barrier reef-bank complex in Lunnan area which have been developed during the deposition of Middle Ordovician Yijianfang Formation.4)The high energy type carbonate platform margin can be represented by the framework reef-bank complex in Tazhong I faulted zone which have been developed during the latestage deposition of the Upper Ordovician Lianglitage Formation.The framework reef-bank complexes in the high energy carbonate platform margin are the most favorable exploration targets.Sea level ascending

tectonic uplifting and descending and carbonate yield are the main factors that control the migration of carbonate platform margins and their types

and they further control the development of organic reefs and banks on carbonate platform margins.