The reservoir characterization and rock typing is a significant tool in performance and prediction of the reservoirs and understanding reservoir architecture, the present work is reservoir characterization and quality Analysis of Carbonate Rock-Types, Yamama carbonate reservoir within southern Iraq has been chosen. Yamama Formation has been affected by different digenesis processes, which impacted on the reservoir quality, where high positively affected were: dissolution and fractures have been improving porosity and permeability, and destructive affected were cementation and compaction, destroyed the porosity and permeability. Depositional reservoir rock types characterization has been identified depended on thin section analysis, where six main types of microfacies have been recognized were: packstone-grainstone, packstone, wackestone-packstone, wackestone, mudstone-wackestone, and mudstone. By using flow zone indicator, four groups have been defined within Yamama Formation, where the first type (FZI-1) represents the bad quality of the reservoir, the second type (FZI-2) is characterized by the intermediate quality of the reservoir, third type (FZI-3) is characterized by good reservoir quality, and the fourth type (FZI-4) is characterized by good reservoir quality. Six different rock types were identified by using cluster analysis technique, Rock type-1 represents the very good type and characterized by low water Saturation and high porosity, Rock type-2 represents the good rock type and characterized by low water saturation and medium–high porosity, Rock type-3 represents intermediate to good rock type and characterized by low-medium water saturation and medium porosity, Rock type-4 represents the intermediate rock type and characterized by medium water saturation and low–medium porosity, Rock type-5 represents intermediate to bad rock type and characterized by medium–high water saturation and medium–low porosity, and Rock type-6 represents bad rock type and characterized by high water saturation and low porosity. By using Lucia Rock class typing method, three types of rock type classes have been recognized, the first group is Grain-dominated Fabrics—grainstone, which represents a very good rock quality corresponds with (FZI-4) and classified as packstone-grainstone, the second group is Grain-dominated Fabrics—packstone, which corresponds with (FZI-3) and classified as packstone microfacies, the third group is Mud-dominated Fabrics—packstone, packstone, correspond with (FZI-1 and FZI-2) and classified as wackestone, mudstone-wackestone, and mudstone microfacies.

储层表征和岩石分型是储层性能和预测以及了解储层构造的重要工具，目前的工作是碳酸盐岩类型的储层表征和质量分析，已选择伊拉克南部的Yamama碳酸盐岩储层。Yamama组受到不同成岩作用的影响，对储层质量产生了积极影响，其中高度积极的影响有：溶解和裂缝改善了孔隙度和渗透率，破坏性影响了胶结和压实，破坏了孔隙度和渗透率。沉积物岩石类型的表征已通过薄层分析得以确定，其中已识别出六种主要的微相类型：pack石-粒岩，pack石，瓦克石-pack石，瓦石，泥岩-瓦石和泥岩。通过使用流动带指示器，在Yamama组内已定义了四个组，其中第一种类型（FZI-1）表示储层质量差，第二种类型（FZI-2）的特征在于储层的中间质量，第三类（FZI-3）的特征是储层质量好，第四类（FZI-4）的特征是储层质量好。通过聚类分析技术确定了六种不同的岩石类型，岩石类型1代表非常好的类型，并且具有低水饱和度和高孔隙度的特征，岩石类型2代表了很好的岩石类型，并且具有低水饱和度和中高的特征。岩石类型3代表中等至良好的岩石类型，其特征是中水饱和度低，孔隙度中等，岩石类型4代表中等岩石类型，特征在于中等水饱和度和中低孔隙度；岩石类型5代表岩石中级到劣质岩石类型，特征在于中高水饱和度和中低孔隙度，岩石类型6代表不良岩石类型，并具有高含水饱和度和低孔隙度的特征。通过使用Lucia Rock类别分类方法，已识别出三种类型的岩石类别，第一类是以谷物为主的织物-颗粒岩，它代表具有（FZI-4）的非常好的岩石质量，并被分类为堆积岩-颗粒岩，第二组是谷物为主的织物-堆积石，对应于（FZI-3）并被分类为堆积石微相，第三组是泥浆为主的织物-堆积石，堆积石，