摘要
为了研究三肇凹陷青山口组源岩生成的油向下"倒灌"运移层位,对油向下"倒灌"运移机制及条件进行了研究,得到三肇凹陷扶杨油层同时具备①青山口组源岩目前应具有足够大的超压;②存在连通青山口组源岩和扶杨油层的T2断裂2个条件,青山口组源岩生成的油能够在超压的作用下在嫩江组沉积末期、明水组沉积末期和古近系沉积末期通过T2断裂向下伏扶杨油层中"倒灌"运移。利用压力封闭原理,对三肇凹陷青山口组源岩生成的油向下"倒灌"运移距离进行了研究,得到三肇凹陷青山口组源岩生成的油向下"倒灌"运移距离一般大于500m,而三肇凹陷扶杨油层地层厚度最大只有500m,表明三肇凹陷青山口组源岩生成的油可以向下"倒灌"运移至整个扶杨油层的任何部位。目前三肇凹陷扶杨油层从上至下均含油,且已找到的油藏均分布于青山口组源岩生成的油能够向下"倒灌"运移分布范围内或附近,这表明青山口组源岩生成的油向下"倒灌"运移层位控制着油气富集层位,青山口组源岩生成的油向下"倒灌"运移分布范围控制着三肇凹陷扶杨油层油藏形成与分布范围。青山口组源岩生成的油向下"倒灌"运移分布范围及其附近应是三肇凹陷扶杨油层油下一步勘探的有利地区。
To study migration horizons downward of oil from Kiqn source rock in Sanzhao depression The mechanism and condition of oil migration downward was studied. It was considered that two conditions in F, Y oil lagers, they are ①enough high overpressure and ②T2 faults connected k1 qn source rock and F, Y oil lagers. Oil from k1 qn source rock can migrate downward into F,Y oil layer in the end of K1n, K2m, and E sedimentary period under the action of overpressure. The migration distance downward of oil from k1qn source rock in Sanzhao depression was studied by the principle of pressure seal. The migration distance downward of oil from k1 qn source rock is generally more than 500 m, the maximum thickness of F,Y oil lagers is only 500 m, it indicates that oil from Kiqrt source rock can migrate downward into all F, Y oil layers. There is oil from top of F oil layer to bottom of Y oil layer now, and oil reser- voirs found in F, Y oil layers of Sanzhao sag distribute in the migration areas downward of oil from K1 qn source rock. It indicates that the migration horizon downward of oil from K1qn source rock controls the oil accumulation horizons, the migration areas downward of oil from K1 qn source rock controls oil accumulation areas. The migration areas downward of oil from K1 qn source rock and its around should be favorable areas for oil exploration in F, Y oil lagers of Sanzhao depression.
出处
《沉积学报》
CAS
CSCD
北大核心
2008年第2期355-360,共6页
Acta Sedimentologica Sinica
基金
国家重点基础研究发展规划项目(编号:2001CB209104)
博士学科点专项科研基金(20060220002)资助
关键词
三肇凹陷
青山口组源岩
超压
扶杨油层
“倒灌”运移
层位
Sanzhao depression； Kiqn source rock； overpressure； F； Y oil layer； migration downward； horizons
