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Controls on depositional facies in Upper Cretaceous carbonate reservoirs in the Zagros area and the Persian Gulf, Iran

机译：伊朗扎格罗斯地区和波斯湾上白垩统碳酸盐岩储层的沉积相控制

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摘要

In the Zagros area and the Persian Gulf, Upper Cretaceous carbonate sequences are among the most important hydrocarbon reservoirs. In this study, facies analysis and stratigraphic interpretation of these sequences, Cenomanian-Santonian in age, have been carried out in subsurface sections from various parts of the Zagros area (including the Dezful Embayment and Fars Province) and the Persian Gulf. To have a better understanding about the facies variations at the regional scale, depositional facies of these formations have been determined and grouped as facies associations. Frequency analyses of depositional facies and their characteristics reveal considerable variations in the study area. These are interpreted to have resulted from the combined effects of paleoenvironmental conditions and platform configuration. The overall depositional model of these formations is that of a carbonate ramp, which was likely homoclinal for the Sarvak and distally-steepened for the Ilam Formation. The isopach maps of the studied intervals are depicted based on the available data from hundreds of drilled wells, surface sections and seismic interpretations. Large scale variations in facies and thicknesses of the studied formations are interpreted to be controlled by regional tectonic evolution and sea-level fluctuations during the Upper Cretaceous.
机译：在Zagros地区和波斯湾，上白垩统碳酸盐岩层系是最重要的油气藏之一。在这项研究中，已经在Zagros地区（包括Dezful Embayment和Fars省）和波斯湾的不同地区的地下剖面中进行了这些年龄为Cenomanian-Santonian序列的相分析和地层解释。为了更好地了解区域范围内的相变，已经确定了这些地层的沉积相并将其归类为相联。沉积相及其特征的频率分析揭示了研究区域的巨大变化。这些被解释为是由古环境条件和平台配置的综合影响导致的。这些地层的总体沉积模型是碳酸盐岩斜坡的沉积模型，对于萨尔瓦克岩层可能是单斜的，而对于伊兰姆岩层则是远端加长的。根据数百个钻井，地表剖面和地震解释的可用数据，描绘了研究区间的等渗线图。所研究地层的相和厚度的大规模变化被解释为受上白垩世区域构造演化和海平面波动的控制。

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