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首页> 外文期刊>Facies >Depositional environments and sequence stratigraphy of the Sarvak Formation in an oil field in the Abadan Plain, SW Iran
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Depositional environments and sequence stratigraphy of the Sarvak Formation in an oil field in the Abadan Plain, SW Iran

机译：伊朗西南部阿巴丹平原油田萨尔瓦克组沉积环境和层序地层学

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摘要

The late Albian-early Turonian Sarvak Formation is the most important carbonate reservoir of the Abadan Plain, SW Iran. Twelve microfacies were identified, representing six facies belts: lagoon, shoal, rudist biostrome, slope, proximal, and distal open marine. The lower and middle parts of the Sarvak Formation were deposited in a carbonate ramp, whereas the upper part is attributed to a carbonate shelf. For relative dating, biostratigraphic analysis recognized two main biozones as well as two biofacies. The biozones are Nezzazata-Alveolinids Assemblage Zone; and Nezzazatinella-Dicyclina Assemblage Zone with a Cenomanian and Turonian age, respectively. The biofacies are Rudist debris and Oligostegina facies, which involve a wide time-range and are dated based on their stratigraphic position. From the identification of sequence boundaries and maximum flooding surfaces, four third-order sequences in the Sarvak Formation were recognized. The sequence boundaries, dated as early Cenomanian, mid-Cenomanian, Cenomanian-Turonian, and mid-Turonian, are major disconformity surfaces, showing evidence of karstification, dissolution-collapse brecciation, and development of paleosols. The maximum flooding (MF) surfaces are discriminated by development of deep-marine facies and also high gamma-ray responses on the well logs. The identified sequences can be correlated with the sequence stratigraphic framework established for the Arabian Plate and Zagros Basin. The results from this study should contribute to the identification of exploration and production targets in the Abadan Plain and neighboring area.
机译：晚期的阿尔比亚－早突尼斯萨尔瓦克组是伊朗西南阿巴丹平原最重要的碳酸盐岩储层。确定了十二个微相，代表六个相带：泻湖，浅滩，鲁迪斯生物圈，斜坡，近端和远端开放海相。萨尔瓦克组的下部和中部沉积在碳酸盐岩斜坡上，而上部则归因于碳酸盐岩层架。对于相对年代，生物地层学分析识别出两个主要的生物区以及两个生物相。这些生物区是Nezzazata-Alveolinids组合区。和具有扎诺曼尼亚时代和突尼斯时代的Nezzazatinella-Dicyclina集合区。这些生物相为鲁迪斯碎屑和卵石质相，涉及的时间范围很广，并且根据它们的地层位置确定了年代。通过识别层序边界和最大洪泛面，可以识别出萨尔瓦克组中的四个三阶层序。序列边界的年代为早西诺曼期，中西诺曼期，西诺曼期-Turonian和Turnian中期，是主要的不整合面，显示了岩溶作用，溶蚀-崩解和古土壤发育。最大的淹没（MF）表面通过深海相的发展以及测井曲线上的高伽马射线响应来区分。识别出的层序可以与为阿拉伯板块和扎格罗斯盆地建立的层序地层学框架相关。这项研究的结果应有助于确定阿巴丹平原及其附近地区的勘探和生产目标。

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