塔里木盆地英南2井侏罗系气藏性质  

Gas Pool Property of Jurassic in Well Yingnan 2 of Tarim Basin.

作　　者：杨晓宁[1] 王国林[2] 张丽娟[2] 胡剑风[2] 金英爱[2] 

机构地区：[1]成都理工大学沉积地质所,四川成都610059 [2]中国石油塔里木油田分公司研究院,新疆库尔勒841000

出　　处：《新疆石油地质》2003年第3期218-220,177,共3页Xinjiang Petroleum Geology

摘　　要：塔里木盆地英吉苏凹陷英南2井侏罗系天然气气藏具有深盆气藏的性质。该区古生界具有分布广、生烃强度高的烃源岩和区域深坳陷。生烃中心位于深坳陷中,其上倾方向为致密砂岩。而且在较好砂岩储集层的上部具有连片分布的致密砂岩。气藏盖层的封闭机理是由于致密砂岩微细孔喉产生的毛细管压力,致密砂岩所具有的水锁现象增大了微细孔喉的毛细管压力,成为油气封堵层,阻止了油气纵向上大量的散失,使得天然气在相对好的砂岩储集层中聚集成藏。由于天然气具有高度扩散能力,在漫长的地质历史时期,已经聚集成藏的天然气会部分扩散到上部地层中而发生散失,同时由于坳陷中的烃源岩具有持续生烃能力,使气藏中散失掉的气体得以补充,这样,便形成了动态平衡的气藏。Jurassic gas pool in Well Yingnan 2,Yingjisu seg of Tarim basin is characterized by deep,basinal gas pool. Source rocks with higher hydrocarbon,generating ratio are distributed widely in Paleozoic stratum with regionally developed deep seg. Hydrocarbon,generating center locates in the deep seg with down,dip tight sandstone successively distributed on the better quality of sandstone reservoir. The closure mechanism of gas pool's cap rock is resulted from the process of capillary pressure and water,sealed event that could augment the capillary pressure,becoming seal of oil and gas,preventing from the vertical diffusing of them which allow gas accumulated in the better quality of sandstone reservoir and finally formed the oil,gas pool. During the long geological history,gas would partially diffuse to upper strata from the pool due to its higher diffusivity. At the same time,source rocks in the sag generating hydrocarbon,which supplemented the diffused gas,forming a gas pool with dynamic balance of diffusion and supplement.

关 键 词：天然气气藏 深盆气藏 成藏模式 塔里木盆地 烃源岩 

分 类 号：P618.130.1[天文地球—矿床学]