The analyses on the origin,composition,rock type,pore structure and physical properties of the rock layers show that the three kinds of mixosedimentite layers correspond to three types of sedimentary environments.

On the basis of micro section identification data of the reservoirs, the author considers that the main factors affecting physical property parameters are rock type, grain size, porosity type and clay content.

Based on a large amount of investigatlon data of rock types and death cases of erophagus cancer, the relation-sliip between mortality of emphagus cancer and rock types in the living areas of people have been studied.