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石南油气田位于准噶尔盆地腹部陆西地区的基东鼻凸，中、下侏罗统上、下含油而中部含气。上部原油主要储集在头屯河组的中孔、中渗砂层组，为构造岩性型油藏；中部天然气主要储集在三工河组的低孔、低渗砂层组，为岩性型气藏；下部原油主要储集在三工河组的中孔、中渗砂层组，为构造型油藏。以往认为该油气田的油藏为次生油藏，但其油气未经历任何次生蚀变作用。其原油具有较典型的腐泥型母质成因特征，热演化程度较低；其天然气为腐殖型，热演化程度较高。对石南油气田成藏史的认识为：盆１井西凹陷下二叠统烃源岩主要为腐泥型，在早白垩世晚期大量生、排液态烃，该地区白垩系区域盖层沉积后，液态烃沿侏罗纪发育的张性断裂运移，进入头屯河组和三工河组储集物性较好砂层组中的圈闭聚集，形成原生油藏；该凹陷上二叠统乌尔禾组烃源岩为腐殖型，在第三纪晚期大量生成气态烃，仍沿张性断裂运移，大部分聚集于储集物性较差的三工河组砂层中的“空”圈闭，形成原生气藏。图６表２参５（梁大新摘）
Shikan oil and gas field is located in the eastern part of the Junggar Basin, the western base of the eastern part of the nose, the Middle and Lower Jurassic, the lower oil and the central gas. The upper part of crude oil is mainly stored in the middle hole and middle sand layer of Toutunhe Formation and is a structural-lithological reservoir. The central natural gas is mainly stored in the low-porosity and low-permeability sand layers of Sangonghe Formation Lithologic gas reservoirs. The lower part of the crude oil is mainly stored in the mesopore and medium-permeability sandstone formations in the Sangonghe Formation, which is a tectonic reservoir. In the past, the reservoirs of this oil and gas field were considered as secondary reservoirs, but their oil and gas did not undergo any secondary alteration. Its crude oil has the characteristics of typical sapropelic parent material, and its thermal evolution is low. Its natural gas is humus and its thermal evolution is high. The understanding of the history of the Shikan oil and gas accumulation is that the Lower Permian hydrocarbon source rocks in the western sag of Well 1 in Well 1 are mainly sapropelic. In the late Early Cretaceous, a large amount of hydrocarbon was generated and released, and after the Cretaceous caprock was deposited in this area , The liquid hydrocarbons migrated along the Zhangjiahe fault developed during the Jurassic and accumulated into traps in the Toutunhe and Sangonghe reservoirs with good reservoir property to form primary reservoirs. The upper Permian The source rocks of Wuerhe Formation are humic type, and a large amount of gaseous hydrocarbons are generated in the late Tertiary, and are still migrated along Zhang-Zhang fault. Most of the source rocks are gathered in the “empty” sand of the Sangonghe Formation with poor reservoir properties Trap, forming a native gas reservoir. Figure 6 Table 2 Reference 5 (Liang Daxin Abstract)