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沙南油田主要储油层为上二叠统梧桐沟组重力流沉积，以砂砾质高密度浊流为主，间夹有低密度浊流、碎屑流和颗粒流。顶部转化为扇三角洲沉积。主要岩石相类型为正递变砂砾岩、块状砾岩和块状砂岩，其次为粗尾递变砂砾岩、牵引毡砂砾岩、混杂组构砂砾岩和经典浊积岩。正递变砂砾岩、块状砾岩和块状砂岩是主要的含油岩石相。混杂组构砂砾岩是引起油层内部非均质性的主要岩石相。油田的优质储集层微相区为中扇亚相的辫状水道砂砾岩和水道间砂岩。沙南浊积扇经历了发育期、全盛期和衰亡期三个阶段，每个阶段又经历了扇体面积由大变小、颗粒由粗变细的演变过程。
The main reservoir in Shanan Oilfield is gravity flow deposition of the Wutonggou Formation in the Upper Permian, dominated by high-density sand-gravel turbidite with low-density turbid water, debris flow and particle flow sandwiched between them. Top converted to fan delta deposition. The main types of rocks are positive graded glutenite, massive conglomerate and massive sandstone, followed by coarse tail graded gravel, traction feldspar conglomerate, mixed structural glutenite and classic turbidite. Positively-graded glutenite, massive conglomerate and massive sandstone are the major oil-bearing rock facies. Hierarchical conglomerate is the main rock facies that causes the internal heterogeneity of the reservoir. The microfacies of the high-quality reservoirs in the oilfield are fan-shaped sub-facies braided channel glutenite and inter-channel sandstone. The turbid turbid fan in Shanan experienced three stages of development stage, heyday stage and decay stage. Each stage experienced the evolution of fan body area from large to small and coarse to thin.