中国大中型气田天然气的运聚特征

THE FEATURE OF MIGRATION AND ACCUMULATION FOR LARGE AND MEDIUM SIZED GAS FIELDS IN CHINA

魏永佩

WEI Yong-pei

中国石化 石油勘探开发研究院, 北京 100083

Exploration & Production Research Institute, SINOPEC, Beijing 100083, China

中国重点盆地大中型气田天然气的运聚具有多种途径和方式,归纳起来具有如下特点:区域构造运动是造成天然气运移的决定性控制因素;流体势决定天然气运移的方向和聚集的场所。在断陷盆地中,天然气以垂向和阶梯状运移为主;在克拉通、前陆斜坡和大型坳陷盆地中,天然气以侧向运移为主,垂向运移也起重要作用。断裂和不整合面是天然气运移的主要通道;异常压力是高压盆地天然气运移的主要动力,地热对热盆天然气的运移具有一定的影响;盆地的上倾方向和古隆起是天然气运移的指向区。

There are different ways and forms for the migration and accumulation of natural sized gas in large and medium sized gas fields in major basins of China,which could be summarized as following:1.Regional tectonic movement is the most important factors for gas migration;2.Occurence of fluid potential controls the direction of gas migration and the place of accumulation;3.Natural gas is mainly migrated vertically and migrated step by step in a faulted basin,and is dominated by lateral migration in a craton,foreland or large fault sag basin,but with strong influence of vertical migration;4.Faults and unconformity surfaces are the major passways for gas migration;5.Abnormal high pressure is the drive force in high pressure basin,and thermal flow also shows some influence;6.Natural gas is normally accumulated in the updip of a basin and the paleo high.

"九五"国家重点科技攻关项目(99-110-07-01).

https://doi.org/10.11781/sysydz200206490