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南马庄油田的产层为下第三系沙三段，储集砂体为浪控三角洲和湖滨滩坝相．储集岩性以细粒长石砂岩和粗粉砂岩为主．主要自生矿物为碳酸盐和高岭石、伊利石、伊－蒙混层、绿泥石等粘土矿物．还有少量自生石英和长石矿物．储集孔隙以次生粒间孔隙为主，其形成机制与有机质的热演化有关．储层物性虽好，但存在明显的层内、层间和平面非均质性．油层分布受岩性和构造的双重控制．
The production layer of Nan Mazhuang Oilfield is the third member of Shahejie Formation, and the reservoir sand body is the wave-controlled delta and lake bank dam phase. The reservoir lithology mainly consists of fine-grained feldspathic sandstone and coarse siltstone. The main authigenic minerals are clay minerals such as carbonate and kaolinite, illite, Iraqi-mulch, chlorite and so on. There are a small amount of authigenic quartz and feldspar minerals. The pores in the reservoir are dominated by secondary intergranular pores, and their formation mechanism is related to the thermal evolution of organic matter. The physical properties of the reservoir are good, but there are obvious intra-layer, inter-layer and planar heterogeneities. Reservoir distribution is controlled by lithology and tectonics.