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摘要: 对松潘阿坝的烃源岩热演化特征进行了全面研究,选用了适合高演化区的成熟度指标:包裹体测温、沥青反射率及干酪根H/C等地化指标。研究认为:1)该区烃源岩在热演化程度普遍达到了成熟—高成熟阶段;2)沥青反射率及包裹体均一温度均具有多期性,表明该区烃源岩经历了二次或多次生烃。3)平面上,烃源岩的热演化程度明显受动力变质、断裂带及岩浆活动的控制,总体表现为四周高、中间低的特征。存在一个唐克为中心的演化程度相对较低的地区,该区可作为勘探初期首选的靶区。4)纵向上,沥青反射率随深度变化的趋势变得不很明显。5)由于松潘阿坝地区在三叠系之上缺少了像四川盆地连续过渡的侏罗系、白垩系沉积,出现了较大的热演化断层,下部烃源岩生烃早于四川盆地,从而使得烃源岩及三叠系保存条件变差。Abstract: On the basis of the investigation on hydrocarbon source in SongpanAba area, this paper compares the organic thermal evolution with that in Sichuan basin, which has some similarities in structural evolution to SongpanAba area before middle Triassic. It is approach that the thermal evolutional level is higher in SongpanAba area than that in Sichuan basin, and there are several different Bitumen reflectance levels there. Due to the fault and magma activity,the vitrinite reflectance is higher in the margin than that in the center of SongpanAba area. This area centered with Tangke with lower thermal evolution level can be the exploration area at the beginning.
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Key words:
- structural evolution /
- thermal evolution /
- reflectance /
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