In the central-eastern Sirt Basin, enigmatic Intisar domal structures host significant hydrocarbon accumulations. These structures have been commonly interpreted as pinnacle reefs/bioherms occurring in the open-marine basinal environment. Generally, pinnacle reefs/bioherms are mainly characterized by in situ carbonates. The current study challenges the Intisar pinnacle reef/bioherm model by examining one of the domal structures in terms of biostratigraphy, microfacies and depositional environment. These structures were dated using larger benthic foraminifera, which yielded a Middle to Late Paleocene age (Selandian–Early Thanetian). Thirteen microfacies types representing different carbonate ramp environments ranging from outer ramp to inner ramp, were defined. Outer ramp deposits have been observed adjacent to the domal structure, represented mainly by wackestone with small benthic and planktonic foraminifera. The outer ramp deposits are most likely isochronous to the domal structures. The lower part of the domal structures is composed mainly of foraminiferal–algal–echinodermal packstones. The upper part is characterized by foraminiferal–algal–echinodermal packstones with intercalated microbialite–coral boundstones. The euphotic inner ramp deposits are preserved on the crest of the domal structure, consisting of grainstone and packstone rich in Glomalveolina. As a result of this study, the Intisar domal structures are seen as erosional relics of a carbonate ramp and no evidence for pinnacle reef/bioherm model was found.

在锡尔特盆地中东部，神秘的因蒂萨尔穹窿结构蕴藏着大量碳氢化合物。这些结构通常被解释为出现在开放海洋盆地环境中的尖峰珊瑚礁/生物礁。一般来说，尖峰珊瑚礁/生物礁的主要特征是原位碳酸盐。目前的研究通过检查生物地层、微相和沉积环境方面的穹顶结构之一，对英蒂萨尔尖峰礁石/生物礁模型提出了挑战。这些结构使用较大的底栖有孔虫进行年代测定，得出古新世中晚期（塞兰阶-早塔尼阶）。定义了代表从外坡道到内坡道的不同碳酸盐坡道环境的十三种微相类型。在圆顶结构附近观察到了外坡道沉积物，主要表现为含有小型底栖和浮游有孔虫的泥板岩。外斜坡沉积物很可能与穹顶结构等时。穹窿结构的下部主要由有孔虫-藻类-棘皮动物的堆积石组成。上部的特征是有孔虫-藻类-棘皮动物堆积石，夹有微生物岩-珊瑚结界石。穹顶结构的顶部保留了透光的内斜坡沉积物，由富含Glomalveolina的颗粒岩和堆积岩组成。这项研究的结果是，因蒂萨尔穹顶结构被视为碳酸盐坡道的侵蚀遗迹，并且没有发现尖峰礁石/生物礁模型的证据。