Abstract:

To interprete sedimentary environment, it is necessary to master the three foundamental elements with marking features: amplitude, shape and assemnlage. Accondng to the analysis and comparison on the petroliferous series in the Gaoyou Depression, North Jiangsu, the curves' shape and sequence assem-blages of subaqueous alluvial fan, delta, fluvial and deep-water turbidite fan aresummarized as below: 1.Subaqueous alluvial fan: From bottom to top, SP appears to be a sequence assemblage changed from low-amplitude, serrated tank shape or positive serrated shape to middle-high amplitude serrated box shape or bell (funnel)shape to low-amplitude reverse serrated shape; R changes from dense serrated high resistance to serrated high-middle resistance and then disperse serrated middle-low resistance. 2.Delta: The logs of regressive constructive deltas show that the appears to be a sequence assemblage changing from smooth line associated with low-middle amplitude funnel shape to funnel, finger or box shapes of middle-high amplitude to box or bell shape of middle-high amplitude,and R is relatively low. 3.Fluvial: Land-based rivers are developed gradually from braid channels to meandering channels; SP shows shapes from box with fine sawtooth to bellor separated box to bell assemblage maintained by middle amplitude. R changes from serrated middle-high value to middle-lower value. 4.Deep-water turbidite fan: These curves are difficult to be distinguished from that of subaqueous alluvial fan, it is therefore necessary to see about its occurrence location.