Ilam Formation (Santonian) is a member of the Bangestan Group, as an important oil reservoir of SW Iran. Various geological and reservoir quality aspects of this formation were discussed in the Zagros area. However, depositional–diagenetic controls on pore types of this formation are not defined, especially in the Abadan Plain. In this study, an integrated sedimentological and petrophysical evaluation has been carried out in six subsurface sections of this formation throughout the Abadan Plain. Facies analysis indicates deposition in shallow- to deep marine settings of a ramp-like carbonate platform. It includes lagoon, shoal, middle ramp, outer ramp and basinal settings. Various diagenetic alterations have been recorded including carbonate cementation, dissolution, mechanical to chemical compaction and fracturing. They indicate marine to meteoric and shallow- to deep burial diagenetic realms for the Ilam Fm. Controls of depositional and diagenetic processes on reservoir quality and pore types have been evaluated by integrating well logs and porosity–permeability data with petrographic evidence in sequence stratigraphic framework. Accordingly, a higher-order and three lower-order sequences have been defined and correlated across the study area. Various pore types of the reservoir are differentiated and classified into five classes: interparticle, intra-particle/skeletal, vuggy/moldic, fractures and micropores. Accordingly, two reservoir intervals are defined in the Ilam formation that include the following: (1) microporous mud-dominated reservoir in TST of higher-order sequence, in the lower Ilam, and (2) macroporous grain-supported facies in RST of higher-order sequence, in upper part of the Ilam formation.

Ilam组（桑托尼亚）是Bangestan集团的成员，是西南伊朗的重要油藏。在Zagros地区讨论了该地层的各种地质​​和储层质量方面。但是，尚未确定对该岩层孔隙类型的沉积成岩控制，特别是在阿巴丹平原。在这项研究中，已经在整个阿巴丹平原的该地层的六个地下部分中进行了沉积和岩石物理综合评估。相分析表明，在斜坡状碳酸盐台地的浅海至深海环境中沉积。它包括泻湖，浅滩，中坡道，外坡道和盆地环境。已经记录了各种成岩作用变化，包括碳酸盐胶结作用，溶解作用，机械压实作用和压裂作用。它们表明了Ilam Fm的海洋到陨石和浅埋到深埋的成岩作用域。沉积和成岩过程对储层质量和孔隙类型的控制已通过将测井曲线和孔隙度-渗透率数据与岩相学证据在层序地层学框架中整合在一起进行了评估。因此，已经定义了一个高阶和三个低阶​​序列，并将它们在整个研究区域内关联起来。储层的各种孔隙类型被分为五类：颗粒间，颗粒内/骨架，孔洞/分子，裂缝和微孔。因此，在Ilam地层中定义了两个储层层段，其中包括：（1）在较低的Ilam中，高阶序列的TST中以微孔泥为主的储层，