摘要
流体包裹体对地下热液活动及油气运移具有较好的示踪作用 ,尽管在确定最高古地温及其时间方面存在一些不确定性。为了评价均一温度的可靠性 ,该文首先用物质平衡法推导出了包体测温的数学模型。模型表明 ,体积较大的包体测温数据较准确。对莺琼盆地包体测温数据系统分析研究表明 ,该区包体的均一温度主要受来自深部 30 0 0～ 40 0 0米的热液活动控制。流体包裹体发育与超压层埋深、烃源岩生排烃作用而引起的热液活动和油气运移具有密切关系。
Fluid inclusion is an efficient tracer to understand the subsurface thermal fluid and hydrocarbon migration, however, it has some uncertainties in determining maximum paleotemperature and its precise period. In order to estimate the reliability of homogenization temperatures, a mathematical model for laboratory homogenization temperature measurement is set up based on mass conservation theory. The formula indicates that bigger fluid inclusions are more precise in determining forming temperatures. The case study of Yingqiong Basin shows that the homogenization temperatures of the inclusions are dominated by thermal fluid from 3000~4000m near fracture zone, and the forming condition of the fluid inclusions indicates a close relation with the overpressure beds, hydrocarbon generation, expulsion and migration. This conclusion is agreeable with the observation data of vitrinite reflection ratio and some borehole temperatures.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第4期695-699,共5页
Acta Petrologica Sinica
基金
国家自然科学基金"九五"重点项目 (编号 :4973 2 0 0 5 )资助
关键词
盆地
流体包裹体
均一温度
热液活动
油气运移
Yingqiong Basin, Fluid inclusion, Homogenization temperature, Thermal fluid movement
