引用本文：闫建萍,刘池阳,张卫刚,李彪.2010.鄂尔多斯盆地南部上古生界低孔低渗砂岩储层成岩作用特征研究[J].地质学报,84(2):272-279. yanjianping,liuchiyang,ZHANG Weigang,LI Biao.2010.Diagenetic Characteristics of the Lower Porosity and Permeability Sandstones of the Upper Paleozoic in the South of Ordos Basin[J].Acta Geologica Sinica,84(2):272-279.
Abstract:Detailed study on the rock property， pore types， measured porosity and permeability， cement and diagenesis of sandstones of Shan2-He8 member in the South of Ordos Basin indicates that the major pore types are micropores related to cement and clay mineral，which is the master factor leading to lower porosity and permeability. The main diagenesis types of sandstones are the mechanical compression，cementation and dissolution. Compression is one of the main factors that reduced the reservoir quality in early diagenetic stage. Cementation plays the most important role on the loss of porosity，especially the calcic cement，and the major cements include calcites，quartz overgrowths and clay minirals. The feldspar and calcite were dissolved by the organic acid liquids produced from the buried coal strata，which resulted in lots of secondary porosity in early diagenetic phase and contributed retention of reservoir quality of the sandstones， but the intense calcite cementation lately made the porosity loss.