Sedimentary microfacies of fan delta in deep strata series of Anpeng oilfield

Through a lot of core observation and description,combining with the sedimentary characteristics,logging data and regional geological data,the comprehensive analysis of sedimentary characteristics and sedimentary facies in deep strata series of Anpeng oilfield was carried out.The results indicated the region belonged to fan delta sedimentary system and had 9 kinds of lithofacies.In sandstone and conglomerate,parallel bedding,oblique bedding and massive bedding were mainly developed.There mainly developed underwater distributary channel,mouth bar,sheet sand microfacies,etc.The sedimentary microfacies distribution characteristics of different sand bodies at different periods were made clear and compared with that of in alluvial fan sedimentary system.Based on forming conditions,lithologic features and sedimentary microfacies analysis of fan delta,the study on identification mark of the fan delta was carried out and its sedimentary model was established.