Extensive research has been carried out on the control of tectonics on sedimentation of sandstone in rift basins.The tectonic-dominated mechanism controlling sandstone development and the process of sediment filling for the upper 4

th

-3

rd

member of the Eocene Shahejie Formation (the Es

4

and the Es

3

) in eastern Zhanhua Sag

Jiyang Depression in Bohai Bay Basin

were investigated through well-seismic correlation

core description and thin section observation.The results show that (1) level-Ⅰ tectonic transition zones lay down the macroscopic tectonic-sedimentary framework

and multi-stage tectonic slope breaks and eustatic lake level control the sand body accretion of different system tracts in the third-order sequences and the cyclicity of sedimentary systems; while level-Ⅱ tectonic slope break zones and secondary faults control the local sand transport systems and sand body distribution within the system tracts

and steep slope zones are often infavorable for input of clastics into lake basins;(2) SQ1 and SQ2 have two isolated sand transport systems (Gubei and Gunan)

while SQ3 has a single sand transport system with the Gubei and Gunan being combined into one

so small but numerous fan deltas without significant progradation or retrogradation are mainly developed in SQ1

while deltas

(semi-)deep lake and gravity flow sand bodies occur in SQ2

and large-scale deltas are dominant in SQ3

with gravity flow sand bodies being common in the (semi-)deep lake area; (3) Tectonic activities control

via tectonic transition zones

slope breaks

secondary faults and steep slopes

sandstone development and sediment filling process in multi-fault lacustrine basins

whereas paleoclimate can only function to strengthen or weaken the controlling effect of tectonic activities

but will not change the sediment filling process in the basin.