| In terms of geological surroundings of co2 in deep formation in XuJiaWeiZi, generally analyzing co2 reservoir formation conditions which include the cause of co2 creation and co2 reservoir geological condition .properties of reservoir bed , sealing condition ,trap characters ,this paper deeply analyzes the main control factors of forming co2 reservoir and the control effects to forming reservoir .Based on above ,it brings forward the formation reservoir model of co2 in this area and the predict the benefit block.Through studying on the cause of creation of co2 is mainly inorganic .The most mud caprock of d2 in this area can strongly protect from fleeing. Through probability calculation of volcanic trap ,we can conclude that co2 risk probability in volcanic trap in Xujiaweizi are generally high. It conforms to well location .The variety of .the solubility of co2 hi this area under the condition of reality underground shows three trends. If the depth above 500m, the more solubility of co2 will be in water ,the more the depth is .If the depth 500m~1250m,the more the depth is ,the less the solubility of co2 in water .If the depth below 1250m, the more the depth is ,the more the solubility of co2 hi water. In terms of the laws the co2 diffusion ,using FeiKe law, this paper calculates the quantity of co2 .Calculating the diffusion quantity of co2 through the 5th,6th volcanic body in Fangshen 9 and Fangshen 701,the maximum of the co2 diffusion can get 23.5* 10s m3 ,and it is enough to destroy an industry gas deposit. It manifests that the role of the co2 diffusion is important to deposit formation .Generally considering the distribution of the deep faults, benefit and fault of the reservoir property, quantity of caprock ,it predict the benefit area formation reservoir hi XuJiaWeiZi duanxian which mainly locates at WangJia tun , ShenPing,and ChangDe .This paper can devotes much to exploration of co2 reservoir in oil fields and have the reference meaning.
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