Table 1 Logging response characteristics of different fluids.

From: Log interpretation method of resistivity low-contrast oil pays in Chang 8 tight sandstone of Huanxian area, Ordos Basin by support vector machine

Fluids

AC(us/m)

DEN(g/cm3)

ΔGR

ΔSP

RT(Ω.m)

Range

Ave

Range

Ave

Range

Ave

Range

Ave

Range

Ave

Resistivity low-contrast Oil

209–240

223

2.37–2.52

2.38

0.1–0.34

0.24

0.5–0.94

0.72

6.4–20.5

10.2

High resistivity Oil

212–231

221

2.44–2.52

2.48

0.09–0.45

0.26

0.4–0.85

0.66

23.03–92

57.68

Water

220–240

235

2.37–2.45

2.39

0.15–0.24

0.20

0.6–0.83

0.72

8.7–10.13

9.25

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