The variation of sorting

grain size and clay content is controlled by hy-drodynamic conditions.Each environment follows its own special law in hy-drodynamic properties and evolution.They may control sand distribution

sequence and log shape

with the last one reflecting the first two macro-scopic sedimentary characters(in this paper

the log refers mainly to SPcurve).Consequently

the combinations of log shapes in various environments are different.Synthesizing the characteristics of log such as amplitude

sha-pe

upper and lower contact

smooth or serrated degree

combination of logshape

and combining them with other geologic logging

we can reach a cor-rect conclusion on sedimentary environment.In eastern China

Tertiary faulted lake basins contain many kinds of en-vironments such as alluvial fans

braided and meandering streams

deltas

littoral beaches and bars

subaqueous alluvial fans

sebaqueous channels ofdensity current and turbidity current(deep Water).This paper summarizesthe characters of logs for the environments mentioned above

including thoseof single serration and combinations of log shapes reflecting the sequenceand their relations with geologic background.In the stage of exploration

a comprehensive interpretation of the charactersof these logs is helpful to geologists in explaining sedimentary environmentsand predicting distribution of sandbodies.So it is an useful method.