Based on comprehensive analysis of core, cast thin section, logging and seismic data, the sedimentary and reservoir architectures of the MB1-2 sub-member of Mishrif Formation in Halfaya Oilfield, Iraq, are studied. The MB1-2 sub-member of Mishrif Formation has three types of microfacies, lagoon, bioclastic shoal, and tidal channel, and facies architecture controlled by sequence stratigraphy. In the 4^th-order sequence, the lagoon facies aggradated vertically, and the bioclastic shoals in lenticular shape embed in the background of lagoon, the end of the sequence is incised by the “meandering river” shape tide channel, which represents the depositional discontinuity. Three types of reservoirs including tidal channel grainstone to packstone reservoirs, bioclastic shoal grainstone to packstone reservoirs and dissolved lagoon wackestone reservoirs are developed. The reservoir architectures within tidal channel and bioclastic shoal are strickly controlled by grainy facies, whereas the dissolved lagoon reservoirs controlled by both facies and dissolution are related to the sequence boundary. The reservoir sections occur mainly in the 4th sequence highstand systems tract (HST) and are separated by barriers formed in the transgressive systems tract (TST). Complicated facies architecture and dissolution modification resulted in strong heterogeneity within the reservoir, which showed the characteristics of “attic type” architecture. The results of this study can guide the development of similar reservoirs in the Middle East.

在对岩心，铸件薄片，测井和地震资料进行综合分析的基础上，研究了伊拉克哈法亚油田米什里夫组MB1-2子段的沉积和储层构造。Mishrif组的MB1-2子成员具有三种类型的微相：泻湖，生物碎屑浅滩和潮汐通道，并且相层序受层序地层学控制。在4^个层序，泻湖相垂直聚集，并在泻湖的背景下嵌入了呈透镜状的生物碎屑浅滩，序列的末端被“蜿蜒的河”形潮汐通道切开，这代表了沉积的不连续性。开发了三种类型的储集层，包括潮汐河道砾石至砂砾岩储集层，生物碎屑浅滩粒岩至砾岩储集层和溶解泻湖砂砾岩储集层。潮汐河道和生物碎屑滩内的储层构造受粒相严格控制，而受相和溶解控制的溶解泻湖储层与层序边界有关。储层部分主要出现在第四阶高位系统域（HST）中，并被海侵系统域（TST）中形成的屏障隔开。复杂的相构造和溶蚀改造导致储层内部强烈的非均质性，这显示出“阁楼型”构造的特征。这项研究的结果可以指导中东类似水库的开发。