Forming mechanism and reservoir characteristics of tight quartz sandstone of coal-bearing strata of the second member of Shanxi Formation in Yulin area, Ordos Basin
Online published: 2010-12-15
The coal-bearing strata of the second member of Shanxi Formation are the main target strata for natural gas exploration in Yulin area of Ordos Basin，and the tight quartz sandstone with relatively high permeability of the second member of Shanxi Formation is the main reservoir in Yulin Gasfield. During the long diagenesis stages, the pore water in coal-bearing strata is acidity, which makes the cement in the quartz sandstone has the obvious characteristics of low content of carbonate cement, high content of siliceous cement and well developed kaolinite. The pore type of the quartz sandstone is the combination of remained intergranular pore and the secondary dissolved pore, and it is characterized by great change of pore structure, low radius of the pore throat, low stress sensitivity and well developed fracture. The research result shows that the compaction of the quartz sandstone is caused by the squeezing action and siliceous cementation during the diagenesis stage.
ZHAO Wanjin , ZHANG Qiaofeng , SU Qin . Forming mechanism and reservoir characteristics of tight quartz sandstone of coal-bearing strata of the second member of Shanxi Formation in Yulin area, Ordos Basin[J]. Lithologic Reservoirs, 2010 , 22(4) : 57 -63 . DOI: 10.3969/j.issn.1673-8926.2010.04.010
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