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大庆长垣以东地区是松辽盆地油气勘探的重点地区 ,登娄库组 ,泉一、二段和青山口组 ,嫩一、二段泥岩分别是深部和中下部含油气组合的油气封盖层 ,由于二者形成于盆地不同的发育阶段 ,它们的形成环境差异较大 ,从而使得它们不仅在发育程度上 ,而且在压力封闭和烃浓度封闭特征上都存在着差异性。深部登娄库组和泉一、二段泥岩除了可对游离相油气形成毛细管封闭外 ,只部分存在较弱的烃浓度封闭 ,且单层厚度小 ,横向分布不稳 ,只能通过相互叠置对油气形成封盖。而中下部青山口组和嫩一、二段泥岩盖层除了具有毛细管封闭能力外 ,还同时具有压力和烃浓度封闭能力 ,可对任何相态的油气进行封闭 ,因此 ,该区深部与中下部盖层条件的差异性是造成二者油气富集程度差异的重要原因。
The east of Daqing Changyuan is the key area for oil and gas exploration in the Songliao Basin. The Denglouku Formation, the Quaternary I, the Sec. And the Qingshankou Formation are the east of Daqing Changyuan. The mudstones in the Nenti 1 and Sec 2 are oil and gas cap Because of their different developmental stages in the basin, the formation environments of the two are quite different, which makes them not only in the degree of development, but also in the characteristics of pressure and hydrocarbon concentration. In addition to capillary sealing of free-phase hydrocarbons, the mud-rock of Hedesen-1 and 2 sections in the deep Dengloukuo Formation are only partially sealed by the weak hydrocarbon concentration, and the single-layer thickness is small and the horizontal distribution is not stable, Oil and gas formation of the cover. In addition, the Qingshankou Formation and the Nennel 1 and 2 mudstone capstones in the middle and lower parts of the mudstone cover not only have the capillary sealing ability but also have the sealing ability of pressure and hydrocarbon concentration, which can seal any oil and gas phases. Therefore, the deep and middle part The difference of caprock conditions is the important reason that causes the difference between oil and gas accumulation.