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

查看全文 作　　者：Sfidari [1]EBRAHIM;Amini [1]ABDOLHOSSIEN;Kadkhodaie [2]ALI;Sayedali [3]MOHSEN;Zamanzadeh SEYED [4]MOHAMMAD 高影响力作者 机构地区：[1]Department of Geology, College of Science, University of Tehran, Tehran, Iran;[2]Earth Science Department, Faculty of Natural Science, University of Tabriz, Tabriz, Iran;[3]National Iranian Offshore Oil Company (IOOC), Tehran, Iran;[4]Faculty of Geography, University of Tehran, Tehran, Iran高影响力机构 出　　处：《Acta Geologica Sinica(English Edition)》索引2018年第92卷第4期,共21页高影响力期刊 摘　　要：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：质量改进 阿拉伯人 水库 油矿 伊朗 近海 乳房 岩石类型
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