陕甘宁盆地中部气田的天然气产于奥陶系顶部古风化亮马家沟组白云岩储层中,储集空间的形成是不同期次溶蚀作用和充填作用相互作用的结果.溶蚀孔洞充填物为方解石、白云石、硬石膏、石英、黄铁矿等矿物,根据充填层序及矿物地球化学特征可识别出不同期次的充填物.溶蚀孔洞的充填程度和充填类型明显地控制着储层的储集性. Natural gas from gas fields in central Shaanxi-Gansu-Ningxia Basin is formed in the dolomite reservoir of paleoclimate Liangmajiagou Formation at the top of the Ordovician. The formation of reservoir space is the result of the interaction between different stages of dissolution and filling. For the calcite, dolomite, anhydrite, quartz, pyrite and other minerals, according to the filling sequence and mineralogical and geochemical characteristics can be identified in different periods of fillings .Filling cavities filling degree and filling type obviously control the reservoir The reservoir.