<正>It is difficult to identify and predict non-marine deep water sandstone reservoir facies and thickness,using routine seismic analyses in the Xingma area of
The iron and manganese absorption properties of several filter media were studied. Four plain filter media and six surface-modified media were examined. The sur
Lower groups of coal seams are presently being mined in the Yanzhou coal mining area. We need to evaluate the risk from water-inrush from coal floors in order t