The diagenetic changes of the Lower-Middle Eocene limestones in the area to the west of AssiutMinia Stretch include the following processes: compaction, cementation, neomorphism, silicification, glauconitization and ferrugination. The compaction is represented by mechanical and chemical types. Cementation is either shallow submarine (represented by micrite, fibrous calcite and isopachous calcit...

The present work focuses on the upper Cretaceous (Cenomanian-early Campanian) carbonate successions in selected wells from northwestern Iraq. These are represented by Gir Bir Turonian), Wajna (late Santonian) and Mushorah (early Formations. succession has affected early burial near-surface, unconformity-related deep diagenesis cementation, neomorphism, dolomitization, dedolomitization, silicifi...

A detail sedimentological analysis of the Sarki Formation (Early Jurassic) in Warte and Zarwan sections Imbricated Zone, northern Iraq has been conducted for first time. The both studied are consisting dolomite, dolomitic limestone recrystallized breccia. petrographic study 80 thin analyzed outcrops showed skeletal non-skeletal components. components including ostracods, bivalves echinoderms. W...

The Microfacies analysis of the Cretaceous Mishrif Formation was studied in Nasiriyah oil field Governorate, southern Iraq using integrated borehole data set that included, core samples and well logs newly drilled to analyze microfacies Diagenesis Process formation, 100 thin sections for selected well. results show formation composed of: (top base) a fine-grained, limonitic fresh water limeston...

Extensive study of modern Bahamian stromatolites has resulted in a comprehensive model for their formation. Modern Bahamian thrombolites—microbial deposits with a mottled, clotted fabric— have not, however, received the same degree of study. Current models link the Bahamian thrombolites with the presence of a mixedbacterial-and-metaphyte benthic ecosystem, whereas stromatolite formation is link...

Carbonate rocks are composed of carbonate minerals that chemically formed in the form solutions, and there organisms involved their formation. The limestone found around Lake Limboto is very interesting, because water lake freshwater while characteristic a marine environment. Diagenesis natural process sedimentary occurs from initial deposition until it reaches limit metamorphism will be formed...

This study applied clumped isotope analyses to investigate how different limestone components (larger skeletal grains and enclosing matrix) cements may have varying degrees of susceptibility recrystallization during progressive burial. The results also provide new constraints on the temperatures cementation, nature waters involved, timing diagenetic events, effect oil emplacement inhibiting pro...

The Central Iran Basin is a region with unique environmental characteristics in which the Late Paleogene–Early Neogene benthic foraminifera display distinctive distributions and abundances that can assist identifying intervals best reservoir potential. Lipidocyclinid miogypsinid zonal marker taxa this be correlated those SBZ23 (European Basin), indicating an Oligocene (Chattian) age. With sedim...

This study presents a thorough analysis of the sedimentology, diagenesis, and sequence stratigraphy Middle Jurassic Samana Suk Formation in Hazara Basin northern Pakistan. Focusing on two sections, namely Mera Rehmat Por Miana, research aims to unravel complex geological processes within formation. The examination microfacies reveals nine distinct depositional textures, ranging from mudstone wa...

The Upper Cretaceous carbonates along the Zagros thrust-fold belt “Harir-Safin anticlines” experienced extensive hot brine fluids that produced several phases of hydrothermal cements, including saddle dolomites. Detailed fluid inclusion microthermometry data show dolomites precipitated from (83–160 °C) and saline (up to 25 eq. wt.% NaCl; i.e., seven times higher than seawater salinity). interac...