松辽盆地肇源地区石炭系—二叠系热演化史研究

Research of Carboniferous-Permian Thermal History in Zhaoyuan Area of Songliao Basin

松辽盆地肇源地区镜质体反射率(RO)—深度(H)曲线在石炭系—二叠系顶部不整合面呈连续变化,表明石炭系—二叠系为后期深埋藏。通过Suggate标准图版确定研究区最大古地温梯度为石炭系—二叠系早白垩世抬升剥蚀前的古地温梯度。结合流体包裹体发育部位和均一温度可知石炭系—二叠系地层存在2期充注。研究表明,肇源地区石炭系—二叠系烃源岩后期深埋藏存在二次生烃,为二次生气有利区。

The curve of vitrinite reflectance （Ro）-depth （H） is successive across the unconformity on top of Carboniferous-Permian strata in Zhaoyuan area, which means the Carboniferous-Permian buried deep dur- ing the later sedimentation. The maximal paleogeothermal gradient of the study area is the Carboniferous- Permian paleogeothermal gradient analyzed by R. P. Suggate standard plate. Based on the occurring posi- tions and homogenization temperatures of fluid inclusions, there are twice hydrocarbon charges. The results show that the Carboniferous-Permian source rocks have a secondary hydrocarbon-generation after later deep burial,and Zhaoyuan area is the favorable area for secondary gas-generation.