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本文研究了与乐安油田油气形成有关的第三系与前第三系不整合、第三系内部古近系与新近系之间的不整合的特征,分析了不整合与油气成藏的关系:不整合改善了油气的储集空间,不整合面是油气侧向运移的良好通道,不整合面为油气聚集提供了有利场所。指出在乐安地区第三系与前第三系不整合面上部是泥岩,下面是灰岩的地方寻找潜山油藏和地层超覆油藏。在乐安地区第三系内部古近系与新近系之间的不整合面上下地层接触关系是截超关系,岩性是上泥下砂的地方寻找地层不整合遮挡油藏。指出了有利勘探方向。
In this paper, the unconformities of the Tertiary and Pre-Tertiary systems related to oil and gas formation in the Le’an Oilfield and the unconformities between the Paleogene and Neogene within the Tertiary are studied. The relationship between unconformity and hydrocarbon accumulation is analyzed : Unconformity improves oil and gas reservoir space. Unconformity is a good channel for lateral migration of oil and gas. Unconformity provides a favorable place for hydrocarbon accumulation. It is pointed out that the upper part of the Tertiary and Pre-Tertiary unconformity in the Le’an area is mudstone, and the limestone below is the place where buried hill reservoirs and overlying reservoirs are looked for. The unconformity between the Paleogene and the Neogene in the interior of Tertiary in the Le’an area is related to the relationship between the upper and the lower strata, and the lithology is where the upper mud descends for unconformity to cover the reservoir. Pointed out that the favorable exploration direction.