Table 1 Statistical table for distinguishing parameters of paleosalinity and trace elements in Yacheng formation of well ST31X.

From: Development characteristics of Yacheng formation source rocks and its enlightenments on petroleum exploration in Songxi sag of Qiongdongnan basin

Parameters

Salt water

Brackish water

Fresh water

First member

Second member

Third member

Interval

Mean

Interval

Mean

Interval

Mean

Li

 > 150

90 ~ 150

 < 90

32.1 ~ 68.2

49.26

23.2 ~ 87.7

53.28

26.4 ~ 56.1

38.15

Sr

800 ~ 1000

500 ~ 800

100 ~ 500

134 ~ 288

188

111 ~ 240

155.27

78.1 ~ 408.95

147.31

Ni

 > 40

25 ~ 40

20 ~ 25

8.99 ~ 20.4

14.05

3.78 ~ 15.5

10.69

8.72 ~ 18.7

12.02

Ga

 < 8

8 ~ 17

 > 17

11.2 ~ 21.4

16.05

10.1 ~ 34.1

22.24

14.4 ~ 30.2

23.36

Sr/Ba

 > 1

0.6 ~ 1

 < 0.6

0.05 ~ 0.14

0.07

0.05 ~ 0.22

0.09

0.06 ~ 0.65

0.16

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