Table 4 Comparison of fluid identification results by different methods.

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

NO	Top (m)	Bottom (m)	Cross plot of Rt-Por		BP model		RBF model		SVM model		Oil test results
NO	Top (m)	Bottom (m)	Fluid identification Result	Agreement	Fluid identification Result	Agreement	Fluid identification Result	Agreement	Fluid identification Result	Agreement	Oil (t/d)	Water (m³/d)
1	2502.7	2503.5	Oil layer	✓	Oil layer	✓	Oil layer	✓	Oil layer	✓	33.32	0
2	2516.4	2740	Oil layer	✓	Oil layer	✓	Oil layer	✓	Oil layer	✓	31.96	0
3	2565	2571.3	Oil layer	✓	Oil layer	✓	Oil layer	✓	Oil layer	✓	8.0	0
4	2356.1	2360.5	Oil layer	✓	Oil–water layer	×	Oil–water layer	×	Oil layer	✓	27.12	0
5	2531.6	2533	Oil layer	✓	Oil layer	✓	Oil layer	✓	Oil layer	✓	13.0	0
6	2590	2595.8	Oil–water layer	×	Oil–water layer	×	Oil–water layer	×	Oil layer	✓	7.88	0
7	2397.6	2401.8	Oil–water layer	×	Oil layer	✓	Oil layer	✓	Oil–water layer	×	11.9	0
8	2469.4	2472.9	Oil–water layer	✓	Oil layer	×	Oil layer	×	Oil–water layer	✓	4.34	10.7
9	2813.5	2816.2	Oil layer	×	Oil–water layer	✓	Oil–water layer	✓	Oil–water layer	✓	4.68	2.5
10	2652.8	2656.8	Oil layer	×	Oil–water layer	✓	Oil–water layer	✓	Oil–water layer	✓	1.56	10.6
11	2607.4	2609.8	Oil–water layer	✓	Oil–water layer	✓	Oil–water layer	✓	Oil–water layer	✓	11.22	5.6
12	2614.2	2618	Oil–water layer	✓	Oil–water layer	✓	Oil–water layer	✓	Oil–water layer	✓	4.86	6.5
13	2544.3	2548.7	Oil layer	×	Oil layer	×	Oil–water layer	✓	Oil–water layer	✓	5.44	6.9
14	2602	2605.3	Oil–water layer	✓	Oil–water layer	✓	Oil–water layer	✓	Oil–water layer	✓	6.58	10.9
15	2696.4	2698.8	Water layer	✓	Water layer	✓	Water layer	✓	Water layer	✓	0	12.2
16	2595	2600.5	Water layer	✓	Water layer	✓	Water layer	✓	Water layer	✓	0	33.6
17	2665	2667.2	Water layer	✓	Water layer	✓	Water layer	✓	Water layer	✓	0	19.8
18	2819.1	2822	Water layer	✓	Water layer	✓	Water layer	✓	Water layer	✓	0	11.0
19	2527	2529.2	Oil layer	×	Dry layer	✓	Dry layer	✓	Oil layer	×	0	0
Accuracy			68.421%(13/19)		78.947%(15/19)		84.210% (16/19)		89.473% (17/19)		/

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Table 4 Comparison of fluid identification results by different methods.

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