In view of the key issue that the development effectiveness of low permeability reservoir is enhanced by fracturing,sandstone reservoir is taken as research object,based on sandstone strength analysis,the reaction process and mechanism of the typical minerals in sandstone and acid liquid system are studied.

Using sedimentary facies control of reservoir physical properties, the paper puts forward a facies-controlled model to predict physical property parameters of sandstone reservoirs between wells and to research sandstone thickness as well as lateral distribution of reservoir porosity and permeability by building a model of reservoir physical property parameters.

the method , s precision(70%)was proved through predicting sandstone thickness of different sand body and well pattern density of Beierdong dense well pattern testing area.

We studied the relationship between sandstone grain size and log responses on cores from block 2,3,4 and 5 in Ningdong in the west of Mahuangshan working area.

Physical properties of highly weathered sandstone at Hongshanyao;

At the equal w/c ratio,the fluidity and the cement mortar strength of the coarser separated fly ash were low.