The overpressure variation in the Cenozoic–Jurassic succession in the northern part of the Danish Central Graben may broadly be divided into three major compartments. An upper hydrostatically pressured unit comprises the post-mid Miocene–recent succession down to c. 1200 m depth in the northern and c. 700 m in the southern parts of the Danish Central Graben. The second compartment comprises the mid-Miocene smectite-rich clays down to and including the upper Cretaceous chalk. There the Paleogene–Lower Miocene succession provides the seal. The third compartment constitutes the Jurassic succession with pressure above hydrostatic that may exceed twice that seen at the upper Chalk level. Pressure levels can be estimated using the Eaton approach for the second compartment that are in agreement with pressure data. Modelling of the transient pressure development in the Cretaceous–mid-Miocene succession broadly complies with the Eaton estimates and shows that the main overpressure build-up has occurred within the last 10 myr. The overpressure in this succession may be mapped using methods that exploit correlations between fluid pressure and the degree of consolidation, while that in the Jurassic cannot. However, the lateral variation in the Upper Jurassic overpressure correlates broadly with the maturity of the Upper Jurassic source rock, allowing the pressure variation to be mapped.

Thematic collection: This article is part of the Geopressure collection available at: https://www.lyellcollection.org/cc/geopressure

丹麦中部地堑北部新生代-侏罗纪序列的超压变化可大致分为三个主要隔间。一个上部的静水压力单元包括中新世中期后-最近的连续到c。北部和c深度 1200 m. 丹麦中央地堑南部700 m。第二个隔室包括中新世中期富含蒙脱石的粘土，直至并包括上白垩纪白垩。那里的古近纪-下中新世演替提供了密封。第三个隔室构成侏罗纪序列，压力高于静水压力，可能超过粉笔上部水平的两倍。可以使用与压力数据一致的第二隔室的伊顿方法估计压力水平。白垩纪 - 中新世中新世演替中瞬态压力发展的建模大致符合伊顿的估计，并表明主要的超压积聚发生在过去 10 分钟内。可以使用利用流体压力与固结程度之间的相关性的方法绘制该序列中的超压图，而侏罗纪中的超压则不能。然而，上侏罗统超压的横向变化与上侏罗统烃源岩的成熟度广泛相关，从而可以绘制压力变化图。

专题合集：本文是 Geopressure 合集的一部分，可在以下网址获得：https://www.lyellcollection.org/cc/geopressure