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受多期构造运动影响,东营凹陷形成多期不整合面。其中新生界与中古生界不整合广泛分布于凹陷之中,其上覆地层与下伏地层的接触关系多为削超样式。不整合结构层中的风化粘土层,经过成岩压实作用,极易固结,形成非渗透层,具有很好的封堵效应。由于风化淋滤作用,不整合面下的风化砂砾岩、碳酸盐岩等的渗透性均得到不同程度的改善,成为输导油气甚至储集油气的有利场所。油气在不整合中运移主要通过2种方式:不整合结构层侧向输导和不整合“天窗”式垂向输导。受不整合削超或平超式、砂/泥型或泥/砂型等多种岩性组合的控制,东营凹陷南斜坡多发育地层超覆、不整合削截油藏。
Affected by the multistage tectonic movement, the Dongying Sag formed multiple unconformities. Among them, the unconformity between the Cenozoic and Mesozoic is widely distributed in the depression, and the contact between the overlying strata and the underlying strata is mostly cut-overs style. The weathered clay layer in the unconformity structure layer is easily consolidated by diagenetic compaction to form a non-permeable layer with good blocking effect. As a result of weathering and leaching, the permeability of weathered glutenite and carbonate rocks under the unconformity surface has been improved to some extent, making it a favorable site for transporting oil and gas and even reserving oil and gas. Oil and gas migration in unconformity mainly through 2 ways: unconformity lateral and lateral unconformity “skylight ” type vertical guide. Controlled by various lithologic combinations such as unconformity cut-over or over-flattening, sand / mud type or mud / sand type, the multi-development stratum over the southern slope of Dongying sag is unconformably cut-off.