High-Resolution Sequence Architecture and Seismic Sedimentology Interpretation of Fan Delta

Abstract

The primary sedimentary pattern of 1st and 2nd member of Shahejie Formation in Oilfield A, Bohai Bay Basin, is fan delta, with thick reservoir, vertically continually deposited and laterally superimposed in migrating, which is based on high-resolution sequence architecture. The comprehensive analysis proves that research on thick reservoir of fan delta follow the principle of regarding description on main sedimentation area as core and treating different facies differently. Guided by reservoir correlation patterns, sequence boundaries can be clarified by degrees, including 5 short-term cycles and 12 super short-term cycles under 1 mid-term base level cycle. Based on best option for seismic data of certain frequency, 4 stratal slicing patterns about multiple fans are built to accomplish seismic sedimentology interpretation in high-resolution sequence architecture. The results show that, fan size of 1st and 2nd member of Shahejie Formation in Oilfield A expand at the first stage and then shrink gradually and fan shape evolves from skirt-rim pattern to ribbon pattern, according with sequence architecture division.

AAPG Datapages/Search and Discovery Article #90291 ©2017 AAPG Annual Convention and Exhibition, Houston, Texas, April 2-5, 2017