利用流体包裹体确定古地温梯度的探讨——以苏北盆地为例  

AN APPROACH TO THE DETERMINATION OF PALEOGEOTHERMAL GRADIENT BY FLUID INCLUSIONS——A CASE STUDY OF THE NORTH JIANGSU BASIN

作　　者：谈彩萍[1] 

机构地区：[1]中国石化石油勘探开发研究院无锡实验地质研究所,江苏无锡214151

出　　处：《石油实验地质》2003年第B11期610-613,共4页Petroleum Geology & Experiment

摘　　要：碎屑岩(岩石)沉积、成岩过程中,会发生结晶、颗粒次生加大等作用。在这种矿物的结晶、生长过程中,碎屑岩孔隙中的液体会被捕获在矿物的晶体缺陷、空穴、晶格空位、位错及微裂隙之中,成为流体包裹体。利用包裹体测温资料,可以确定沉积盆地各地质时期的古地温,并计算出古地温梯度,反映沉积盆地在地质历史中的古地温演化状况。石油地质研究认识到,干酪根在60～150℃温度范围内生成石油,在150～200℃温度范围内生成天然气。因此,恢复沉积盆地在不同历史时期的古地温及古地温梯度,在石油地质研究中具有十分重要的意义。The sedimentation and diagenesis of clastic rocks are accompanied by crystallization and grain secondary enlargement. During the crystallization and growth of mineral, the liquid in clastic rock pores is trapped in the crystal defects and holes, lattice vacancy and dislocation and microfissures of mineral to form fluid inclusions. Using the thermometric data of inclusions, the paleogeotemperature for each geologic ages of the sedimentary basin is determined, and the paleogeothermal gradient is calculated. They reflect the evolutionary situation of paleogeotemperature in the geologic history of the sedimentary basin. It was rea-lized from petroleum geological studies that kerogen changes into petroleum in the temperature of 60-150℃ and into natural gas in the temperuture of 150-200℃. Therefore, the reconstruction of paleogeotemperature and paleothermal gradient for the different historical periods of the sedimentary basin has very important significance for petroleum geological studies.

关 键 词：均一温度 包裹体 古地温梯度 

分 类 号：P588.2[天文地球—岩石学]