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Diagenetic and Depositional Impacts on the Reservoir Quality of the Upper Jurassic Arab Formation in the Balal Oilfield, Offshore Iran

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Acta Geologica Sinica(English Edition) 2018年第4期92卷 1523-1543页

作者： Sfidari EBRAHIM Amini ABDOLHOSSIEN Kadkhodaie ALI sayedali mohsen Zamanzadeh SEYED MOHAMMAD Department of Geology College of Science University of Tehran Tehran Iran Earth Science Department Faculty of Natural Science University of Tabriz Tabriz Iran National Iranian Offshore Oil Company (IOOC) Tehran Iran Faculty of Geography University of Tehran Tehran Iran

The Kimmeridgian-Tithonian aged Arab Formation, as the main reservoir of the Jurassic succession in the Balal oilfield, located in the offshore region of the Iranian sector of the Persian Gulf, is investigated in this study. The formation is composed of dolomites and limestones with anhydrite interbeds. Based on detailed petrographic studies, six microfacies are recognized, which are classified in four sub-environments including supratidal, intertidal, lagoonal and the high energy shoal of a homoclinal carbonate ramp. The main diagenetic features of the studied succession include dolomitization, anhydritization, cementation, micritization, fracturing and compaction. Based on stable isotope data, dolomitization of the upper Arab carbonates is related to sabkha settings （i.e. evaporative type）. In terms of sequence stratigraphy, three shallowing-upward sequences are recognized, based on core and wireline log data from four wells of the studied field. Considering depositional and diagenetic effects on the reservoir quality, the studied facies are classified into eight reservoir rock types （RRT） with distinct reservoir qualities. Dolomitization has played a major role in reservoir quality enhancement, whereas anhydritization, carbonate cementation, and compaction have damaged the pore throat network. Distribution of the recognized RRTs in time and space are discussed within the context of a sequence stratigraphic framework.

关键词： reservoir quality Arab Formation Balal oilfield offshore Iran Persian Gulf

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Association between metformin and vitamin B12 deficiency in patients with type 2 diabetes

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World Journal of Diabetes 2023年第5期14卷 585-593页

作者： Ehsan sayedali Ali Erdinc Yalin Serap Yalin Department of Biochemistry Faculty of PharmacyMersin UniversityMersin 33169Turkey

Diabetes mellitus(DM)is still one of the most common diseases worldwide,and its prevalence is still increasing *** to the American and European recommendations,metformin is considered a first-line oral hypoglycemic drug for controlling type 2 DM(T2DM)*** is the ninth most often prescribed drug in the world,and at least 120 million diabetic people are estimated to receive the *** the last 20 years,there has been increasing evidence of vitamin B12 deficiency among metformin-treated diabetic *** studies have reported that vitamin B12 deficiency is related to the malabsorption of vitamin B12 among metformin-treated T2DM *** B12 deficiency may have a very bad complication for the T2DM *** this review,we will focus on the effect of metformin on the absorption of vitamin B12 and on its proposed mechanisms in hindering vitamin B12 *** addition,the review will describe the clinical outcomes of vitamin B12 deficiency in metformintreated T2DM.

关键词： Metformin Vitamin B 12 deficiency Diabetes mellitus Vitamin B12 Type 2 diabetes mellitus

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