STUDY ON THE NATURAL GAS ACCUMULATION MODELS AND STRUCTURE OF THE YINGGEHAI BASIN
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摘要: 莺歌海盆地是在地幔隆起拉伸作用和沿红河断裂的走滑作用双重机制控制下,在红河断裂带向海延伸部分的基础上发展起来的,具有断陷坳陷双重结构.莺歌海盆地的演化经历了断陷形成期和坳陷形成期两个阶段,在不同的演化阶段热沉降和红河断裂活动所起的作用是不同的.莺歌海盆地天然气成藏可划分为中央底辟带成藏模式和莺东斜坡带成藏模式.底辟热流体的活动为盆地中央天然气成藏提供了聚集场所和动力条件,高压封存箱内的天然气以涌流方式多次向上释放并聚集成藏.而莺东斜坡带上的天然气藏是盆地深部生成的天然气在水溶对流机制的驱动下运移到斜坡带上并在储盖配置良好的部位聚集的结果.Abstract: The Yinggehai Basin was developed on the base of the seaward extended part of the Red River Rift zone controlled by the double mechanisms of mantle-uplift extension and strike slipping along the Red River Rift.It has rift-depression dual structure.The evolution of the Yinggehai Basin has experinced rift and depression formation two stages.During different evolutionary stages,thermal subsidence and the Red River rifting played different parts.The Yinggehai Basin has the central diapir zone and the Yingdong slope zone two natural gas accumulation models.The activities of diapir heat flow provided accumulation places and dynamic conditions for the accumulation of natural gas in the central of the basin,and the natural gas in high-pressure compartments released upward many times by the way of outpouring flowing and then accumulated.On the other hand,the natural gas pools in the Yingdong slope zone were the results of natural gas generated in the deep part of the basin migrated to the slope zone driven by solution convection mechanism and then accumulated in reservoir-cap well-matched positions.
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Key words:
- accumulation model /
- basin structure /
- the Yinggehai Basin
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[1] 龚再升,李思田,等.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社,1997. [2] 张义纲,陈彦华,陆嘉炎.油气运移及其聚集成藏模式[M].南京:河海大学出版社,1997. [3] Hunt J M.Generation and migration of petroleum from abnormally pressured fluid compartments[J].AAPG Bulletin,1990,74:1-12. -
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