摘要
应用流体包裹体检测技术研究了川中-川南地区须家河组流体包裹体特征,分析了烃类的充注时期,探讨了气藏压力的分布和成因。研究表明,须家河组包裹体均一温度主要为80-140℃,主峰在100-120℃,不同构造上的均一温度值有差异。须家河组的烃类充注属于连续充注类型,充注时期主要为晚侏罗世至新近纪。须家河组地层压力系数呈规律分布,区域上表现为常压-高压-超高压的渐变特点;纵向上,随地层时代变老,压力系数增大。侏罗纪末和新近纪末的构造运动使地层遭受不同程度的剥蚀,导致区域上地层的古、今温度差异,进而影响压力系数的分布,压力系数随古、今温度差值的增大而降低。
This study characterized the fluid inclusion of Xujiahe formation in middle south Sichuan basin using the technique of fluid inclusion, estimated the charging stages of hydrocarbons, and discussed the pressure distribution of the gas reservoir and the driving forces of forming this distribution. The results indicated that the homogenization temperatures of fluid inclusion of Xujiahe formation were in the range of 80-140℃ with a major peak value at 100 -120℃, and that the values of homogenization temperature varied with different geological constructions. The hydrocarbons changing of Xujiahe formation was continuous changing, and the major changing stage happened during the period of the late Jurassic to Tertiary. The distribution of the pressure coefficients was regular, characterized by changing from normal pressure to high pressure and to extremely high pressure in terms of different regions, and by increasing as the ages of the stratums increasing in terms of different stratum depths. The stratums were denu- dated in varied degrees by the tectogeneses in the end of aggrandizement Jurassic and in the end of Tertiary, which caused the difference of paleo temperature and present temperature and the distribution of pressure coefficient. It is found that the pressure coefficient decreased while the difference of the paleo temperature to the present-temperature increased.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2009年第1期48-52,共5页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家重点基础研究发展规划项目(2007CB209503)
中国石油股份公司科技攻关项目(070104-3)
中国石油科技攻关项目(2008B-0100)
中国石油科技风险创新研究项目(07-06D-01-04-01-03)
关键词
流体包裹体
天然气
油气充注
压力系数
须家河组
四川盆地
Fluid inclusion
natural gas
the time of gas pool formation
pressure coefficient
xujiahe formation
Sichuan Basin
