Characteristics and Genetic Analysis on Algal Limestone Reservoirs, Nanyishan, Western Qaidam Basin

Key words: 
• algal limestones /
• stromatolite /
• porous structure /
• Nanyishan /
• Qaidam basin

Abstract: This research is systematically related to the characteristics and genetic analysis of algal limestones reservoirs, Nanyishan, Qaidam basin. The results show that: 1） Though the water environment of Nanyisan is more muddy than others, algal can still grow; 2) The composition and rock type of the algal limestone are complex, the main rock types include lettucelike stromatolites, algal reef, digitate stromatolies, wavelike stromatolites and so on; 3) The deposits of algal limestones were formed in lowenergy peritidal to subtidal highenergy environment of lakeshore slopes, sliding under the action of gravity and some other factors and become slump Mixosedimentite layers; 4) The physical property of algal limestones layers is better than others; 5)The genetic development of the sediment decides that the single deposit is small, distributive and thinlayed.