古近系阜宁组一段（以下简称阜一段）是苏北盆地高邮凹陷油气富集层系之一，深部储层勘探潜力较大，但储层物性整体较差，制约了该领域的勘探拓展。为了明确局部异常高孔发育、储集条件良好的“甜点”储层展布规律和有利区带，有必要系统开展高邮凹陷阜一段深层异常高孔成因类型及储层演化模式研究。研究利用储层物性分析、薄片观察、电镜扫描、阴极发光等手段，并通过剥去盐城组地层厚度及划分构造单元等方法来开展阜一段深层储层物性分析，认为不同区带阜一段异常高孔分布特征存在明显差异，其中，斜坡带发育双异常高孔段，而断阶带仅发育单一异常高孔段，并明确了异常高孔发育区带。针对不同区带异常高孔的差异成因控制因素进行分析，明确了油气伴生、异常高压是控制异常高孔发育成因的关键因素，其中，油气伴生有助于促进溶蚀、抑制胶结等成岩作用，是斜坡带中坡及断阶带地区异常高孔发育的关键控制因素；地层异常高压有利于促进油气伴生，并起到促进溶蚀、抑制胶结、减缓压实等成岩作用，是斜坡带内坡地区异常高孔发育的关键控制因素。根据关键因素差异及地层压力区带分布，将阜一段异常高孔分为油气伴生型和异常高压型两种成因类型，其中，油气伴生型主要分布在埋藏相对较浅、局部处在深部储层的斜坡带中坡及断阶带等地区，而异常高压型主要处在斜坡带内坡地区，是深层储层的主要类型。同时，建立了阜一段深层两类异常高孔演化模式，其中斜坡带中坡、断阶带主要为油气伴生溶孔保孔模式，而斜坡带内坡为油气伴生与异常高压叠合溶孔保孔模式。在此基础上，指出了斜坡带内坡等深部储层构造高带与地层异常高压叠合区内的有效圈闭是“甜点”储层发育的有利位置，为拓展深部储层提供了依据。

The first member of the Paleogene Funing Formation (hereinafter referred to as E₁f₁) is one of the oil-rich and gas-rich strata in Gaoyou Sag, Subei Basin. It has considerable exploration potential in deep reservoirs, but the overall poor reservoir physical properties have constrained the exploration expansion in this area. To determine the distribution patterns and favorable zones of local "sweet spot" reservoirs with well-developed abnormally high porosity and favorable reservoir conditions, it is necessary to systematically study the genetic types and reservoir evolution models of abnormally high porosity in deep E₁f₁ of Gaoyou Sag. Using reservoir physical property analysis, thin section observation, scanning electron microscopy, and cathodoluminescence, along with stripping the thickness of the Yancheng Formation and dividing tectonic units, this study conducted the physical property analysis of deep reservoirs in E₁f₁. Significant differences were observed in the distribution characteristics of abnormally high porosity among different zones. Specifically, the slope zone developed two abnormally high-porosity intervals, while the fault-step zone developed only one abnormally high-porosity interval. Additionally, the abnormally high-porosity development zones were identified. By analyzing differential genetic controlling factors of abnormally high porosity in different zones, it was determined that oil and gas charging and abnormally high pressure were the two key factors controlling the development zones and genetic types of abnormally high porosity. Oil and gas charging contributed to promoting dissolution and inhibiting cementation, serving as a key controlling factor for the development of abnormally high porosity in the middle slope and fault-step zones. In contrast, abnormally high formation pressure facilitated oil and gas charging, and contributed to diagenetic processes such as promoting dissolution, inhibiting cementation, and slowing compaction, functioning as a key controlling factor for the development of abnormally high porosity in the inner slope zone. Based on differences in key factors and the distribution of formation pressure zones, abnormally high porosity in E₁f₁ was classified into two genetic types: oil and gas charging type and abnormally high pressure type. The oil and gas charging type was mainly distributed in the middle slope and fault-step zones, characterized by relatively shallow burial depths and local occurrence in deep field. The abnormally high-pressure type was mainly located in the inner slope zone, representing the main type in deep field. Two evolution models for abnormally high porosity in deep E₁f₁ were established. Specifically, the middle slope and fault-step zones were mainly characterized by oil and gas charging and pore-preserving dissolution model, while the inner slope zone was characterized by oil and gas charging and abnormally high pressure for pore-preserving superposition dissolution model. On this basis, it is indicated that effective traps in structural high zones overlapping with abnormally high pressure areas of formations in the inner slope and other deep field are favorable locations for the development of “sweet spot” reservoirs, providing a basis for expanding exploration in deep field.