Drilling/logging

3D seismic data and other information were combined with fault activity rate statistics to analyze quantitatively the characteristics of the Paleogene boundary fault activities and their control over sedimentation in southeastern margin of Qinnan Sag

Bohai sea.The result shows the boundary faults in the study area were significantly segmented into four sections:west Shibei1

east Shibei1

west Shibei2 and east Shibei2.Vertically

the faulting initiated during the deposition of Ek to Es

4

and then went through two cycles of enhanced and subdued stages during the deposition of Es

3

Es

1+2

Ed

3

and Ed

2

and finally inactivated during the deposition of Ed

1

.Laterally

the boundary faulting was characterized by being intensive in the central part but weak at both ends during the same geological period.From a space angle

faulting activities were successively carrying on at the same location.The differences of boundary faulting controlled the differential rise and fall of basins

resulting in differential erosion in provenances and the formation of various deposition patterns and tectonic transfer zones

which further affected erosion rate of the provenances

subsidence rate

types and distribution of sedimentary facies

delta extension distance

as well as lithologies in depositional basins.