SW Iran and the adjacent offshore are prolific petroleum-producing areas with very large proven oil and gas reserves and the potential for significant new discoveries. Most of the oil and gas so far discovered is present in carbonate reservoir rocks in the Dehram, Khami and Bangestan Groups and the Asmari Formation, with smaller volumes in the Dashtak, Neyriz, Najmeh, Gurpi, Pabdeh, Jahrum, Shahbazan, Razak and Mishan (Guri Member) Formations. The Permo-Triassic Dehram Group carbonates produce non-associated gas and condensate in Fars Province and the nearby offshore. The Jurassic – Lower Cretaceous Khami Group carbonates are an important producing reservoir at a number of fields offshore and in the southern Dezful Embayment., and are prospective for future exploration. Much of Iran’s crude oil is produced from the Oligo-Miocene Asmari Formation and the mid-Cretaceous Sarvak Formation of the Bangestan Group in the Dezful Embayment. This review paper is based on data from 115 reservoir units at 60 oiland gasfields in SW Iran and the adjacent offshore. It demonstrates that the main carbonate reservoir units vary from one-another significantly, depending on the particular sedimentary and diagenetic history. Ooidal-grainstones and rudistand Lithocodium-bearing carbonate facies form the most important reservoir facies, and producing units are commonly dolomitised, karstified and fractured. In general, reservoir rocks in the study area can be classified into six major types: grainstones; reefal carbonates; karstified, dolomitised and fractured carbonates; and sandstones. The stratigraphic distribution of these reservoir rocks was principally controlled by the palaeoclimatic conditions existing at the time of deposition. A comparative reservoir analysis based on core data shows that dolomitised and/or fractured, grain-dominated carbonates in the Dehram Group, Lower Khami Group and Asmari Formation typically have better reservoir qualities than the Cretaceous limestones in the Upper Khami and Bangestan Groups.

中文翻译：

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伊朗西南和附近海域的巨大油气田的碳酸盐岩储层：地层赋存和孔隙-渗透特征的回顾

伊朗西南和邻近的近海是多产的石油产区，拥有非常大的已探明油气储量和重大新发现的潜力。迄今为止发现的大部分石油和天然气存在于 Dehram、Khami 和 Bangestan Groups 以及 Asmari 组的碳酸盐岩储层中，少量存在于 Dashtak、Neyriz、Najmeh、Gurpi、Pabdeh、Jahrum、Shahbazan、Razak 和 Mishan （九里成员）编队。Permo-Triassic Dehram Group 碳酸盐岩在法尔斯省和附近的近海生产非伴生气和凝析油。侏罗纪 - 下白垩统 Khami Group 碳酸盐岩是近海和 Dezful Embayment 南部许多油田的重要生产储层，具有未来勘探前景。伊朗的大部分原油产自 Dezful Embayment 的 Bangestan Group 的渐新世 Asmari 组和中白垩纪 Sarvak 组。这篇综述论文基于伊朗西南和邻近海域 60 个油气田的 115 个储层单元的数据。这表明主要碳酸盐岩储层单元之间存在显着差异，这取决于特定的沉积和成岩历史。最重要的储集层相为鲕粒岩和ruudistand 含锂碳酸盐岩相，产层多为白云岩化、岩溶化和裂缝化。总的来说，研究区储集岩可分为六大类型：粒状岩；珊瑚礁碳酸盐；岩溶、白云石化和破碎碳酸盐岩；和砂岩。这些储集岩的地层分布主要受沉积时存在的古气候条件控制。基于岩心数据的对比储层分析表明，Dehram 组、Lower Khami Group 和 Asmari 组中的白云石化和/或裂缝性、颗粒为主的碳酸盐岩通常比上 Khami 组和 Bangestan 组中的白垩纪灰岩具有更好的储层质量。