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苏北下第三系阜宁群中的碳酸盐岩,据现有露头剖面和钻井揭露,主要分布于盆缘阜二、阜四段内(表1)。其中阜二段的碳酸盐岩层发育较好,由下而上大体可分三个亚段:下部主要由虫管-藻灰(云)岩、各种粒屑灰(云)岩、砂灰(云)岩夹粉砂岩组成;中部亦称“七尖峰”亚段,主要由薄层状、纸片状泥灰岩、泥晶灰岩组成;上部为灰、深灰色泥岩夹白云质泥晶灰岩组成。关于碳酸盐岩的基本特征,现依次讨论如下。
The carbonate rocks in Funing Group of the Tertiary under the northern Jiangsu are exposed in the existing outcrop profile and drilling and are mainly distributed in the Fu-4 and Fu-4 sections (Table 1). Among them, the carbonate layer in Fu 2 Member is well developed and can be divided into three sub-sections from bottom to top: the lower part is mainly composed of worm tube-algae ash (cloud) rock, various pellet ash (cloud) rocks, (Cloud) rock clip siltstone; also known as “seven peaks” in the central sub-section, mainly composed of thin layer, paper-like marl, montmorillonite composition; the upper ash, dark gray mudstone white sand mudstone Limestone composition. The basic characteristics of carbonate rocks, are discussed in turn below.