Sequence stratigraphic framework and sedimentary types in the Block 5 and 6, Bonan Oilfield;

Platform margin depositional system developed in the southern carbonate platform including four sedimentary types: the beach of carbonate platform margin,the reef platform of carbonate platform margin,platform margin slope and the sea between beach(reef).

After being compared and analyzed, asphaltene deposition models can be classified as the ones based on phase splitting and colloid instability.

The sedimentary features of infralittoral turbidite oil reservoir were studied,and the sedimentary models were reconstructed.

Analysis on the forming mechanism of depositional pyrite ,the authors believe that the environment factor is the main cause of the occurrence and different sources of sulphur should be an important mark to distinguish the depositional type of pyrite.