[Retracted] Reservoir Forming Conditions and Enrichment Law of Tight Sandstone Gas in Upper Paleozoic in Ordos Basin

Table 4

Prediction standard of favorable natural gas exploration area of Taiyuan-Shanxi Formation in study area.

Opinion rating	Hydrocarbon generation intensity (108/km^2)	Thickness of source rock (m)	Favorable sedimentary microfacies
Class I favorable area	≥20	≥30	Main branch river of delta
Class II favorable area	10~20	10~30	Sub-branch channel of delta
Class III favorable area	<10	<10	Sub-branch channel and crevasse fan in the plain