Abstract:

Fan delta sediments developed well in the northern area of Turpan Depression.The subaqueous distributary channel clastic rock bodies in the fan delta front formed the main part of the fan delta and the most important oil and gas reservoirs.The clastic rocks of the reservoir are lithic sandstone and lithic sandy conglomerate.The major components of the reservoir clastic rocks are fragmental materials of tuff and extrusive rock.The main kinds of diagenesis are compaction,hydration and hydrolisis,cementation.The diagenesis made the clastic rocks of fan delta front to be dense reservoirs with low porosity and low permeability.