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为了研究滨北地区青一段烃源岩所生成油气向下“倒灌”运移的层位,对油气向下“倒灌”运移机制及条件进行了研究,认为滨北地区扶杨油层同时具备2个条件:①青一段烃源岩目前具有足够大的超压;②存在连通青一段烃源岩和扶杨油层的T2断裂,青一段烃源岩生成的油气能够在超压的作用下在古近纪末期通过T2断裂向下伏扶杨油层中“倒灌”运移。利用三肇地区14口井资料中青一段古超压同其各自油水界面深度之间的关系,建立了油气向下“倒灌”运移距离同超压之间的拟合公式,在滨北地区青一段古近纪末期泥岩超压恢复的基础上,得到滨北地区青一段烃源岩生成的油气向下“倒灌”运移的最大距离为530m,而且在可以运移范围之内大部分地区通过扶余油层进入杨大城子油层。扶杨油层油井均分布于青一段烃源岩生成的油能够向下“倒灌”运移分布范围内及附近,这表明油向下“倒灌”运移范围及层位控制着滨北地区扶杨油层油藏形成、分布范围和层位。青一段烃源岩生成的油气向下“倒灌”运移范围应是滨北地区下一步勘探的有利区块。
In order to study the layers of hydrocarbon migration down the “Qinglian” source rocks in Binbei area, we studied the transport mechanism and conditions of the downwelling There are two conditions: (1) the source rock of the first member of the Qinghai-Tibet Plateau now has a large enough overpressure; (2) there is the T2 fracture connecting the source rock of the first Qingyuan Formation and the Fuyang reservoir, and the hydrocarbon generated from the source rock of the Qingyuan Member can under the effect of overpressure In the late Paleogene through the T2 fracture down Fuyang reservoir “backfill ” migration. Based on the relationship between the paleo overpressure and the oil-water interface depth of 14 wells in the Sanzhao area, a fitting formula between migration distance and overpressure of downwelling / On the basis of the restoration of mudstone overpressure in the late Paleogene in the Qinghai-Tibet region, the maximum distance of hydrocarbon migration downcropped from “Qing 1” source rock in Binbei area to 530 m is obtained, and it is within the transportable range Some areas through the Fuyu reservoir into the Yangchengzi reservoir. The oil in Fuyang oil layer distributed in the source rock of the first member of Qingyang can move downward and in the vicinity of the distribution range of “backfill”, indicating that the migration range of oil downwards and “backfilling” Regional Fuyang reservoir formation, distribution and horizon. The oil and gas generated from the source rock of the Qingyuan area should be favorable areas for next exploration in the Binbei area.