西沙岛礁白云岩化作用研究进展

Based on the data of Well XK-1 in Shi island, Xisha Islands, dolomitization of reef carbonate is teased and summarized. Several layers of dolostone have been developed in reef island area of Xisha Islands, more evidences suggest that these dolostone are formed in high-salinity seawater environment. However, the driving mechanism of dolomitization in high salinity seawater environment is undefined, which is an important scientific problem for the follow-up study. The alteration of carbonate reservoir by dolomitization in reef islands area is manifested in the increase of porosity and permeability, the improvement of anti-compaction and anti-pressolution, and the occurrence of selective dissolution, which make the reef dolostone being high-quality reservoir. Fluid inclusions and Mg isotopes show unique advantages in the study of dolomitization model and diagenetic environment, and could be an effective path to reveal dolomitization in Xisha Islands.