石油与天然气地质 ›› 2007, Vol. 28 ›› Issue (2): 203-208.doi: 10.11743/ogg20070211

• 研究方法探索 • 上一篇    下一篇

剩余压力差在超压盆地天然气高效成藏中的意义

柳广弟, 孙明亮   

  1. 中国石油大学, 油气成藏机理教育部重点实验室, 北京, 102249
  • 收稿日期:2007-03-26 出版日期:2007-04-25 发布日期:2012-01-16
  • 基金资助:

    国家重点基础研究发展计划(973计划)项目(2001CB209103)

Significance of excess differential pressure in highly efficient gas accumulation in over-pressured basins

Liu Guangdi, Sun Mingliang   

  1. Key Laboratory for Hydrocarbon Accumulation Mechanism, Ministry of Education, China Petroleum University, Beijing 102249, China
  • Received:2007-03-26 Online:2007-04-25 Published:2012-01-16

摘要:

油气形成过程中的成藏动力可以由剩余压力差和浮力两部分共同表述.常压盆地中,浮力为主要成藏动力;超压盆地中,剩余压力差与浮力的和可以代表石油运移过程中的成藏动力、也可以反映天然气运移过程中的最小成藏动力.不同成藏过程中剩余压力差和浮力在整个成藏动力中的相对贡献表明,无论在垂向运移过程还是侧向运移过程,剩余压力差在天然气藏成藏动力中发挥了主导作用,是天然气藏形成的主要成藏动力.结合我国60余个气藏实例解剖发现,剩余压力差控制了天然气的成藏效率,低剩余压力差部位无法形成中、高效气藏,高剩余压力差是形成高效气藏的必要条件.

关键词: 剩余压力差, 浮力, 常压, 超压, 天然气, 高效成藏

Abstract:

Hydrocarbon accumulation dynamics can be described with excess differential pressure and buoyancy.In normal-pressure basins,buoyancy is the major force for hydrocarbon accumulation.While in over-pressured basins,the resultant force of excess pressure differential and buoyancy is the force for oil migration and the minimum force for gas accumulation.An analysis of the contributions of excess differential pressure and buoyancy to the total accumulation dynamics in different pooling processes indicates that the excess differential pressure dominates both the vertical and lateral gas migration and accumulation thus it is the major force for gas accumulation.Dissections of 60 or so gas reservoirs in China also point out that the excess differential pressure controls the efficiency of gas accumulation.Mid-or highly-efficient gas pools will not form in places where low excess differential pressure exists;and high excess differential pressure is a necessary condition for highly efficient gas accumulations.

Key words: excess differential pressure, buoyancy, normal pressure, overpressure, highly efficient gas accumulation

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