To investigate the recurrence behaviors of segment-rupturing eathquakes on active faults of the Chinese mainland, thispaper analyzes quantitatively earthquake h
Se and other trace elements in kerogen are determined. Based on biochemical evidence, theoretical calculations and infrared spectra, it is indicated that Se may
Taking the second district of Shengtuo oilfield as an example, the paper deals with distributioncharacteristics of remaining oil in delta sandstone reservoir. I
Surface modification of montmorillonite by means of Mg~(2+) insertion reaction has been studied and a positively charged montmorillonite has been prepared. The