چکیده مقاله
The Asmari Formation, with Oligo Miocene age, one of the most important hydrocarbon reservoirs for production and extraction in Iran, in the Zagros Basin In the Lorestan region, this formation displays a mixed carbonate evaporite nature, within early Miocene deposits In this study, a subsurface well from the Lorestan sector was analyzed in detail to reconstruct the sedimentary environment, identify microfacies, and assess the reservoir quality based on sedimentary and diagenetic controls A total of 17 sedimentary microfacies were identified, deposited in a homoclinal ramp type carbonate platform The facies distribution and depositional conditions experienced substantial changes across the formation's vertical profile, with a distinct transition from common coral red algae in the lower sequence to rare aragonitic walled red algae Peyssonellia type in the upper sequence Porosity assessment revealed that facies such as packstone to grainstone dominated by aragonitic red algae exhibit the highest average porosity 9 2% , attributed to extensive moldic porosity resulting from algae dissolution In contrast, low energy lagoonal and deeper open marine facies typically showed limited reservoir potential due to micritization and cementation Diagenetic processes, including marine cementation, mechanical compaction, dolomitization, neomorphism, and selective dissolution, significantly controlled the evolution and spatial distribution of porosity A sequence stratigraphic framework highlights the major influence of sea level fluctuations on facies transitions and diagenetic overprints, with evaporite intervals acting as potential sealing units Overall, this study introduces a unique facies model for the Asmari Formation in Lorestan, documenting the replacement of coral red algae with aragonitic red algae, and emphasizes the critical role of diagenesis in enhancing or diminishing reservoir properties in carbonate evaporite systems
کلیدواژهها
نویسندگان
Nazanin Vakili
Islamic Azad University of Shiraz
Kouros Yazdjerdi
Islamic Azad University of Shiraz
شیوه ارجاع
Vakili, Nazanin and Yazdjerdi, Kouros,1404,Facies Characterization, Diagenetic Processes, and Reservoir Quality of the Asmari Formation in the Lorestan Region, Zagros Basin (Iran): A Case Study from a Subsurface Well,Fourth International Congress for Chemical Engineering and Petroleum Industry students,Tehran
ارائهشده در
مجموعه مقالات چهارمین کنگره بین المللی دانشجویان مهندسی شیمی و صنعت نفت29 آبان 1404 · تهران