GENESIS AND DISTRIBUTION REGULARITY OF THE TURBIDITE BODIES IN THE DELTA FRONT

The forming mechanisms,the distribution regularities and the controlling factors of the turbidite bodies in the delta front are analyzed systematically based on the in-door flume experiment simulation results.The forming process of the turbidite bodies can be classified into four stages,e.g.the sediment accumulation before slumping,the triggering action,the secondary transportation of sediments and the final deposition of turbidite bodies.The comprehensive analysis results of various genetic mechanisms indicate that the turbidities mainly distribute in four favorable zones between the delta front and the deep water area with apparent zonality.The secondary slumping turbidities associated to the earthquakes and developed in the deep-water depression are one of the most favorable lithological hydrocarbon reservoir types.The main controlling factors of the turbidities in the delta front include the triggering mechanism,the component and the characteristics of the sediments,the bed shape of the prodelta,the water depth,the elevation and subsidence of the water level,and the supply of the sediments,which all affect,directly or indirectly,the formation and the distribution of the turbidite bodies in different aspects.