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

REN Xiao-juan~ 1,2 WEI Jin-xing~ 3 KANG You-xin~ 2 ZHANG Cun-hou~ 3 (1.Department of Geology, Northwest University, Xi'an 710069; 2.Xi'an Petroleum University, Xi'an 710065; 3.Research Institute of Exploration and Development, Qinghai Oilfield Branch, Dunhuang, Gansu736200)  
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.
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