Abstract: Based on slice observation and petrology analysis,the homogenization temperature,laser Roman spectra,chromatogram and chromatogram-spectrograph of fluid inclusions were tested and analysed in Keyi structural zone where Kela-2 gas pool—the largest one in China at present is situated.Obtained were paleogeotemperature data, single organic inlusion components, together with the organic components and biomarker parameters of inclusion groups. Analysed were the evolution characteristics of paleogeotemperature,diagenesis stages of reservoir rocks,biomarker characteristics in inclusions,the stages of migration evolution and congregation degree. The inclusion study indicates that the oil-gas geological characteristics show the pattern of sectionation in East-West and nonlinear evolution in vertical direction.The characteristics of paleo-geotemperature evolution is paleo-geotemperature change in the trend of high→low→high from west to east.The homogenization of inclusion shows that oil-gas evolution possesses multi-period feature which underwent two or three times of migrition and filling of oil-gas.The diagenetic stage in Keyi structural zone is middle-diagenetic period in which the inclusions of Ⅰ、Ⅱ、Ⅲ come into being in early-middle, middle and later stage of middle-diagenetic period. The whole characteristics of biomarkers of inclusions reflect that mass inclusions contain the oil-gases of different periods.The inclusions-Ⅰrepresents condensate (oil) stage,the inclusions-Ⅱ represents condensate gas stage and inclusions-Ⅲ represents dry gas stage.

Key words: fluid inclusion, paloe-geotemperature evolution, single organic inclusion components, biomarker in inclusions, Keyi structural zone

摘要： 在薄片观察和岩石学研究的基础上,对克拉2气田所处的克依构造带中的流体包裹体,进行了均一温度、激光拉曼光谱、色谱及色谱-质谱的测试分析.取得了古地温数据、单个有机包裹体成分、群体包裹体的有机组分及生标参数等资料.据此分析克依构造带古地温演化特征、储集岩成岩阶段、包裹体中生物标志化合物特征以及油气运移演化阶段和聚集程度.表明克依构造带油气地质特征具有东西分段、垂向非线性演化的格局;古地温演化的总体特征表现为,从西向东古地温呈现高→低→高的变化特征,包裹体的均一温度表明,油气演化具有多期性,分析井中发生2次或3次油气运移和充注.克依构造带的成岩阶段应为中成岩期,其中第Ⅰ、Ⅱ、Ⅲ期包裹体分别形成于中成岩期的早-中期阶段、中期阶段和晚期阶段.包裹体生物标志物的总体特征反映了群体包裹体为多期油气混合的结果.其中第Ⅰ期有机包裹体代表凝析油(气)形成阶段;第Ⅱ期代表凝析气形成阶段;第Ⅲ期代表干气形成阶段.

关键词: 流体包裹体, 古地温演化, 单个有机包裹体成分, 生物标志化合物, 克依构造带