松辽盆地北部热史恢复及烃源岩生烃史

根据镜质体反射率、粘土矿物分析和包裹体测试数据对松辽盆地北部齐家-古龙凹陷、三肇凹陷、黑鱼泡凹陷和双城向斜的古地温进行了研究并恢复了其热历史.它们都是在明水组沉积末期达到最高古地温，从古近纪到现今古地温持续降低.各个凹陷经历的古地温高低顺序依次为：古龙凹陷 >双城向斜 >三肇凹陷 >黑鱼泡凹陷，对应最高古地温为160℃至120℃不等.成烃史研究表明：松辽盆地中-浅层主力烃源岩青山口组-段泥岩随着嫩江组的快速沉积迅速进入生烃阶段，但各地所处成烃阶段不同；齐家-古龙凹陷烃源岩在嫩江组沉积初期进入生油门限，在嫩江组-明水组沉积期为快速生烃期，现为成熟-高熟阶段；双城向斜和三肇凹陷烃源岩在嫩江组沉积中期进入生油门限，于嫩江组-明水组沉积末期为快速生烃期，现为成熟阶段；黑鱼泡凹陷烃源岩在嫩江组沉积期末进入生油门限，于四方台组-明水组沉积期为快速生烃期，现为低熟-成熟阶段.

Thermal history and hydrocarbon generation history in the northern Songliao Basin

By using vitrinite reflectances, clay mineral data and fluid inclusion analyses of the Gulong,Sanzhao,Shuangcheng and Heiyupao Sags in the northern SongLiao Basin, the paleothermal field was qualitatively and quantitatively studied.The three methods verified each other, accomplished thermal history reconstruction well.The maximum palaeogeothermal was reached in the last stage of Mingshui Formation's deposition, then decreased to present.The order of the maximum palaeogeothermal of the four sags was:the Gulong Sag>the Shuangcheng Syncline> the Sanzhao Sag> the Heiyupao Sag, with the maximum palaeogeothermal being 160℃-120℃.The study of hydrocarbon generation history indicated that the main source rocks of middle-shallow strata in the northern Songliao Basin varied from place to place.The Member 1 of Qingshankou Formation came into quick oil-generating stage in period of Nenjiang Formation's deposition, but the four sags were in different oil-generating stages.In the Gulong Sag, hydrocarbon reached oil threshold in early period of Nenjiang Formation's deposition,came into quick oil-generating stage in period of Nenjiang-Mingshui Formations' deposition, and reached the highmature-overmature phase now.In the Shuangcheng and Sanzhao Sags, hydrocarbon reached oil threshold in middle period of Nenjiang Formation's deposition, came into quick oil-generating stage in last stage of period of Nenjiang-Mingshui Formations' deposition, and reached mature phase now.In the Heiyupao Sag, hydrocarbon reached oil threshold in last stage of Nenjiang Formation's deposition, came into quick oil-generating stage in period of Sifangtai-Mingshui Formations' deposition, and reached the low mature-mature phase now.