陕甘宁盆地中部气田产于奥陶系顶部古风化壳碳酸盐岩储集体中，碳酸盐岩储集空间的形成是不同期次的溶蚀作用和充填作用相互作用的结果。

The storage spaces of the carbonate rocks resulted from the interaction of multistage dissolution and infilling, which may be divided into four stages on the basis of the development and evolution.

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次为二叠系碳酸盐岩，全区有机碳平均含量为0.36％。

The regional organic-carbon content is 0.36% on an average.

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