Taking the fourth member of the Quantou Formation in J19 block of Fuyu oilfield as an example

single sandbodies identification was performed within composite underwater distributary channels in delta front by integrating various data including cores

logging and production performance on the basis of sedimentary micro-facies.The results show that there are four main vertical superimposition patterns of single sandbodies

including separated type

overlap-type

overlay type and substitution type

and five lateral contact patterns

including interdistributary contact

embankment contact

butt-joint

side shear and substitution type.The corresponding identification marks are also summarized.The width of single sandbody is in the range from 200-800m and their thickness range from 4-8m.The tops of the separated type sandbodies are rich in remaining oil.In overlap-type

overlay type and substitutional type sandbodies are different in thickness and water injection direction

thus strongly influencing remaining oil distribution.Sandbodies of interdistributary contact

embankment contact and butt-joint kinds are not interconnected laterally

thus remaining oil possibly occurring in the flanks of the sandbodies.In contrast

sandbodies of side shear and substitutional type are well connected laterally

unfavorable for enrichment of remaining oil.