Diagenetic facies and its control over physical property of Chang 8 reservoir in Luopangyuan area of Ordos Basin

Chang 8 oil-bearing layer in Luopangyuan area is one of the important oil producing intervals in Dingbian oil field,but is in low exploration extent,based on data ot physical property analyses,cast-slice,SEM analyses and mercury injection,the paper investigated diagenetic facies in Luopangyuan area and its control over physical property.Draw the following conclusions:the Chang 8 oilbearing layer of the study area was divided into four diagenetic types of facies combination,including rim cementation-corrosion of chlorites,corrosion and carbonate cementation,poikilitic cementation of calcites and dense-mudstone compaction.The distribution of reservoir quality was obviously controlled by diagenetic facies.The reservoir quality of chlorite-rim cementation-corrosion belts are the best,which were proposed to be the most favorable places for reservoir development.The reservoir quality of corrosion and carbonate cementation is less than chlorite-rim cementation-corrosion belts,which is more favorable places for reservoir development.