Dariyan Formation (Aptian) is one of the important hydrocarbon reservoirs in the Persian Gulf. In this reservoir, porosity is controlled by various depositional and diagenetic factors. This study integrates petrographic, geochemical, petrophysical and reservoir quality data to distinguish various pore types and their evolution in two fields selected from the SE and NW Persian Gulf. Primary (depositional) and secondary (diagenetic) pore types are differentiated using the results of macroscopic (core) and microscopic (thin section and SEM) petrographic studies. Pore size distribution and reservoir importance are evaluated by MICP and porosity–permeability measurements on core-plug samples. Macroscopic pores are formed within the grain-dominated and dissolved mud-dominated facies that are located in the RST of third-order sequences, especially within the lower carbonate unit. Micropores are recorded in mud-dominated facies of middle to outer ramp settings with minor effects of meteoric dissolution. Accordingly, evolution in an open diagenetic system with high water/rock ratio is proposed for grain-supported facies, and a closed diagenetic system for mud-dominated intervals. There are close relationships between micrite micro-textures (MTCs) and reservoir properties of mud-dominated facies. A dynamic pore evolution model is presented for the Dariyan Formation that integrates all depositional and diagenetic features in sequence stratigraphic framework. This model can be used for ongoing reservoir studies of this formation in hydrocarbon fields of the Persian Gulf.

达里扬组（Aptian）是波斯湾的重要油气藏之一。在该储层中，孔隙度受各种沉积和成岩因素控制。这项研究整合了岩石学，地球化学，岩石物理和储层质量数据，以区分从东南海湾和西北波斯湾两个油田中的各种孔隙类型及其演化。使用宏观（岩心）和微观（薄层和SEM）岩石学研究的结果来区分主要（沉积）和次要（成岩）孔隙类型。孔隙大小分布和储层重要性通过MICP和岩心塞样品的孔隙度-渗透率测量进行评估。宏观孔隙形成于位于三阶序列RST中的以晶粒为主和以溶解泥为主的相中，特别是在低碳酸盐岩单元内。微孔记录在中斜坡到斜斜坡以泥浆为主的相中，对陨石的溶解影响较小。因此，提出了一种以水/岩石比高的成岩成岩体系演化的方法，用于支持岩相的沉积；对于以泥浆为主的层段，提出了一种封闭成岩的体系。泥岩微结构（MTCs）与以泥质为主的相的储层性质之间有着密切的关系。提出了达里岩组的动态孔隙演化模型，该模型在层序地层框架中整合了所有沉积和成岩特征。该模型可用于正在进行的波斯湾油气田储层研究。微孔记录在中斜坡到斜斜坡以泥浆为主的相中，对陨石的溶解影响较小。因此，提出了一种以水/岩石比高的成岩成岩体系演化的方法，用于支持岩相的沉积；对于以泥浆为主的层段，提出了一种封闭成岩的体系。泥岩微结构（MTCs）与以泥质为主的相的储层性质之间有着密切的关系。提出了达里岩组的动态孔隙演化模型，该模型在层序地层框架中整合了所有沉积和成岩特征。该模型可用于正在进行的波斯湾油气田储层研究。微孔记录在中至外斜坡环境中以泥浆为主的相中，对陨石的溶解影响较小。因此，提出了一种以水/岩石比高的成岩成岩体系演化的支持岩相，而以泥浆为主的封闭成岩体系则被提出。泥岩微结构（MTCs）与以泥质为主的相的储层性质之间有着密切的关系。提出了达里岩组动态孔隙演化模型，该模型在层序地层框架中整合了所有沉积和成岩特征。该模型可用于正在进行的波斯湾油气田储层研究。和一个封闭的成岩系统，以泥浆为主的时间间隔。泥岩微结构（MTCs）与以泥质为主的相的储层性质之间有着密切的关系。提出了达里岩组动态孔隙演化模型，该模型在层序地层框架中整合了所有沉积和成岩特征。该模型可用于正在进行的波斯湾油气田储层研究。和一个封闭的成岩系统，以泥浆为主的时间间隔。泥岩微结构（MTCs）与以泥质为主的相的储层性质之间有着密切的关系。提出了达里岩组的动态孔隙演化模型，该模型在层序地层框架中整合了所有沉积和成岩特征。该模型可用于正在进行的波斯湾油气田储层研究。