The Member 2 of the Lower Permian Shanxi Formation in the eastern Ordos Basin is dominated by quartz sandstones，lithic quartz sandstones and lithic sandstones. The diagenesis includes burial compaction，pressolution，silical cementation，carbonate cementation and replacement，kaolinite cementation，matrix alternation and dissolution. Through the core observations and thin section analyses，combining with cathodoluminescence and scanning electron microprobe studies，seven types of single factor diagenetic facies are identified in the Member 2 of Shanxi Formation in eastern Ordos Basin.
They are severe compaction facies，pressolutionquartz overgrowth facies，the kaolinite dissoluted alternation facies，the precipitating kaolinite facies，matrix filling facies，carbonate cementation and replacement facies and dissolution facies. Furthermore the planar superimposition was made and the favorable diagenetic facies for reservoir development was determined. The combination of pressolutionquartz secondary overgrowth and pseudomatrix dissolution determined the favorable diagenetic facies belt of the Shanxi Formation. Highquality reservoirs in the Member 2 of the Shanxi Formation are distributed in Shaan 141 well area，Yu 37 well area，and ZizhouQingjian area.
. Division and distribution of diagenetic facies of the Member 2 of Lower Permian Shanxi Formation in eastern Ordos Basin[J]. JOPC, 2008, 10(4): 409-418.
