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陕甘宁盆地中部奥陶系风化壳天然气储集层的形成，是不同期次古岩溶长期作用的结果。根据古岩溶发育的形迹，可将古岩溶产生的岩溶岩体系划分为两大类八个亚类，并以岩溶岩为宏观标志，结合其稀土元素，碳、氧、硫同位素，矿物包裹体及生物化学等地球化学特征，建立了该区不同岩溶类型的岩溶相模式，从而揭示了古岩溶储集层形成的水文地质环境及发育规律。
The formation of Ordovician weathering crust natural gas reservoirs in central Shaanxi-Gansu-Ninglang basin is the result of long-term effects of paleokarst in different periods. According to the paleokarst development, the karstifaction systems produced by ancient karstification can be divided into two categories and eight subgroups. The karst rocks are macroscopically signified, combined with their rare earth elements, carbon, oxygen and sulfur isotopes, mineral inclusions and Biochemistry and other geochemical characteristics of the karst facies established karst facies pattern of different karst types in the area, revealing the formation of paleokarst reservoir hydrogeological environment and development law.