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近年来,苏北盆地高邮凹陷岩性油藏的勘探取得重大突破。通过对高邮凹陷岩性油藏成藏过程动态解剖研究,高邮凹陷岩性油藏成藏期处于有利的充注动力窗口,储层物性普遍高于充注临界物性,岩性圈闭早期开始持续发育,因此,高邮凹陷整体具有形成岩性油藏的有利条件。高邮凹陷上含油气系统岩性油藏成藏的关键因素是运移通道和圈闭条件。主控断层早期开启,晚期封闭是研究区岩性油藏成藏的必要条件,同时,砂地比较低,砂体欠发育,泥岩发育有利于形成岩性圈闭,也是成藏不可或缺的条件。岩性油藏在陡坡带和缓坡带均有分布,戴南组岩性油藏的分布具有明显的分带性,靠近凹陷两侧断裂带向深洼带依次发育有断层—岩性油藏、上倾尖灭岩性油藏、砂岩透镜体油藏。
In recent years, the exploration of lithologic reservoirs in the Gaoyou depression of the Northern Jiangsu Basin has made a major breakthrough. Through the dynamic anatomical study on the reservoir forming process of the lithologic reservoirs in the Gaoyou depression, the lithologic reservoirs in the Gaoyou Sag are in favorable charging dynamic windows and their reservoir properties are generally higher than the critical charge properties of the reservoirs. The lithological traps began to last early Therefore, the Gaoyou depression as a whole has the favorable conditions for the formation of lithologic reservoirs. The key factors of hydrocarbon accumulation in lithologic reservoirs with petroleum systems in the Gaoyou sag are migration channels and trapping conditions. The early opening and the late closure of the main fault are the necessary conditions for the formation of lithologic reservoirs in the study area. Meanwhile, the sand area is relatively low, the sand body is undeveloped, and the development of mudstone is favorable for the formation of lithologic traps, which is also an indispensable condition for hydrocarbon accumulation . Lithologic reservoirs are distributed in both steep and gentle slope zones, and the distribution of the Dainan formation lithologic reservoirs is obviously zonated. Fault-lithologic reservoirs are successively developed near the fault zones on both sides of the depression, Up-dumping lithologic reservoir, sandstone lens reservoir.