MAGMATIC NETWORK STRUCTURE OF VOLCANIC-ROCKS IN THE SHENGLI OIL-FIELD, EASTERN CHINA

Types of polymerized molecular network structure and degree of bond br eakdown for glass phases of magmatic inclusions and glassy matrix in v olcanic rocks from the Shengli oilfield have been defined by the laser Raman spectroscopic investigation. There are significant differences in types of polymerized molecular network structure and degree of bond breakdown of the magmatic glass phases between the non-CO2 and CO2 ga s pools: magmatic glass phases of fluid inclusions and matrix in volca nic rocks from the CO2 gas pool contain more sheet network. molecules and have a greater degree of bond beakdown than those from the non-CO2 gas pool; and when gas bubbles occur in evolving magma, magma saturat ed with volatile components has more sheet network molecules: The resu lts suggest the magma-degassing mechanism of the formation of CO2 gas pools in the Shengli oilfield.