Facies analysis and paleogeographical reconstruction of the Asmari Formation in the Lorestan and Dezful Embayment Zones are documented by studying eight outcrop sections and two wells. The new observations provide a basis for correlation and description of the carbonate ramp evolution during the Early Oligocene–Middle Miocene time. Petrographic examinations on 877 thin sections revealed 16 facies which are deposited in tidal flat (4 facies), lagoon (4 facies), shoal (2 facies), shallow open marine (4 facies), and deep marine (2 facies). Tidal flat and lagoon facies associations are extended in the north and east, whiles shoal and shallow open marine facies are more frequent in the south and west of the study area. Detailed analysis of sedimentary facies indicates that in the Oligocene interval, the depositional system of the Asmari Formation was a distally steepened ramp. From northeast Lorestan towards central and south-west Lorestan, the Asmari Formation is replaced by pelagic deposits of the Pabdeh Formation. In the early Miocene, the depositional system changed to a NE–SW trending homoclinal ramp.

通过研究八个露头剖面和两口井，记录了 Lorestan 和 Dezful 海湾地区 Asmari 组的相分析和古地理重建。新的观测结果为早渐新世-中中新世时期碳酸盐斜坡演化的相关性和描述提供了基础。877个薄片岩相检验发现16个相，沉积在滩涂（4相）、泻湖（4相）、浅滩（2相）、浅海（4相）和深海（2相）。研究区北部和东部延伸滩涂和泻湖相组合，而研究区南部和西部则以浅滩和浅海开阔海相较为频繁。沉积相详细分析表明，在渐新世，Asmari 组的沉积体系是一个远端变陡的斜坡。从 Lorestan 东北部向 Lorestan 中部和西南部，Asmari 组被 Pabdeh 组的远洋沉积物所取代。中新世早期，沉积体系转变为 NE-SW 向的同斜斜坡。