中国大中型气田盖层封盖能力综合评价及其对成藏的贡献

doi:10.11743/ogg20050608

摘要/Abstract

摘要：

大中型气田天然气封盖条件主要受盖层自身厚度和排替压力、气藏内部能量(压力系数)和天然气本身性质(流动粘度)的影响。气藏盖层封闭指标CSI值与天然气聚集效率为正比关系,CSI值越大,天然气聚集效率越高;反之则越低。中国大中型气田聚集效率分3个等级:1)大于100×10⁶m³/(km²·Ma)的气藏为高效气藏,主要分布在塔里木、柴达木、莺琼、渤海湾和松辽盆地,以塔里木、柴达木和莺琼盆地居多;2)10×10⁶～100×10⁶m³/(km²·Ma)的气藏为中效气藏,主要分布在四川、东海、松辽、渤海湾、塔里木和吐哈等盆地,以四川盆地最多;3)小于10×10⁶m³/(km²·Ma)的气藏为低效气藏,主要分布在鄂尔多斯盆地和四川盆地。中国大中型气田的形成要求其盖层的CSI值应大于10⁹m/s。然而,对于天然气聚集效率较高的气田,其盖层的CSI值还应更高。

关键词: 盖层, 封盖能力, 综合评价, 指标, 聚集效率, 大中型气田

Abstract:

Sealing ability of cap rock in large and medium gas fields mainly depends on the thickness of cap rock,displacement pressure,interior energy of gas reservoir(pressure coefficient)and gas property(flowing viscosity).Cap rock sealing index(CSI)of gas reservoir is directly proportional to gas accumulation efficiency.The accumulation efficiency of China's large and medium gas fields can be classified into three categories:(1)High efficiency gas reservoirs have accumulation efficiency of over 100?10⁶ m³/(km²·Ma).They are mainly distributed in Tarim,Qaidam,Yinggehai-Qiongzhou,Bohai Bay and Songliao basins,of which Tarim,Qaidam and Yinggehai-Qiongzhou basins are in the majority.(2)Moderate efficiency gas reservoirs have accumulation efficiency in the range of 10?10⁶-100?10⁶ m³/(km²·Ma).They are mainly distributed in Sichuan,East China Sea,Songliao,Bohai Bay,Tarim and Turpan-Hami basins,and most of them are in Sichuan basin.(3)Low efficiency gas reservoirs have accumulation efficiency of lower than 10?10⁶ m³/(km²·Ma).They are mainly distributed in Ordos and Sichuan basins.For the formation of large and medium gas fields in China,the CSI value of cap rocks should be over 10⁹m/s.For gas fields with relatively higher accumulation efficiency,however,the CSI value of cap rocks should be raised even higher.

Key words: cap rock, sealing ability, comprehensive evaluation, index, accumulation efficiency, large and medium gas fields

中图分类号:

TE112.25

吕延防,付广,于丹. 中国大中型气田盖层封盖能力综合评价及其对成藏的贡献[J]. 石油与天然气地质, 2005, 26(6): 742-745,753. doi: 10.11743/ogg20050608 L? Yanfang,Fu Guang,Yu Dan. Comprehensive evaluation of sealing ability of cap rock in China's large and medium gas fields and their contribution to gas accumulation[J]. Oil & Gas Geology, 2005, 26(6): 742-745,753. doi: 10.11743/ogg20050608

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