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首页> 外文会议>Abu Dhabi International Petroleum Exhibition Conference >Sedimentological Characterisation and Sequence Stratigraphy of the Lowermost Lekhwair Deposits of the Southern Tethys Early Cretaceous, Onshore Abu Dhabi
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Sedimentological Characterisation and Sequence Stratigraphy of the Lowermost Lekhwair Deposits of the Southern Tethys Early Cretaceous, Onshore Abu Dhabi

机译：南方南方南部休耕地白垩纪的沉积学特征及序列地层沉积物，陆上阿布扎比

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While the Kharaib and Shuaiba carbonate hydrocarbon reservoirs of UAE benefit from numerous investigations enabling the establishment of a relatively accurate biostratigraphical framework and the characterisation of the sedimentological, depositional and sequence stratigraphical context, the lowermost Lekhwair deposits remain poorly known and are rarely the topic of publications. These Valanginian/ Hauterivian(?) (Alsharan and Nairn, 1986; Granier, 2000) carbonates are studied in the onshore Abu Dhabi area where they host hydrocarbon accumulations within clean shallow inner ramp deposits. These clean carbonates alternate with non-reservoir units comprising clay/organic matter-prone carbonates thought to have been deposited in distal settings (e.g. Hassan and Wada, 1981) and commonly picked as maximum flooding surfaces (e.g. Sharland, 2001; Strohmenger et al., 2006). However, until now it has not been possible to confirm or refute these interpretations due to the lack of petrographical samples within these non-reservoir rocks, which are usually discarded due to their negligible reservoir potential. This work consists of the establishment of the sedimentological framework of the lowermost Lekhwair Formation of an onshore Abu Dhabi area based on the detailed sedimentological descriptions from four cored wells and the analyses of petrographical samples. A facies analysis has been carried out which has resulted in the reconstruction of the depositional environments. The integration of key surfaces characterised in core, marked sedimentological changes and core-calibrated openhole log data have helped in the interpretation of a sequence stratigraphic framework across both the reservoir and non-reservoir units. In summary, an upward change from a dominantly intertidal to clay/organic-prone inner ramp deposition in the lowermost Lekhwair to clean Lithocodium/Bacinella–rich, open and probably marginal inner ramp to proximal mid-ramp deposits reflects a large-scale transgressive phase. The large-scale maximum flooding surface is picked at the base of a c.30–40ft thick massive Lithocodium/Bacinella-bearing interval and is overlain by the upward regression towards more restricted and Lithocodium/Bacinella-free inner ramp deposits. A well-developed karstified surface interpreted as a sequence boundary (SB) caps the large-scale regressive phase. It is overlain by clay/organic-rich inner ramp deposits interpreted to represent the base of the overlying large-scale deepening-upward trend. At a smaller scale, the lower Lekhwair interval consists of alternations between proximal and clay- rich inner ramp, intertidal deposits and clean inner/proximal mid-ramp carbonates. These alternations are thought to be controlled by intermediate-scale sea level fluctuations with the proximal and clay-rich inner ramp deposits being preserved at the base of transgressive trends and the cleanest carbonates being formed during deep conditions (i.e. flooding intervals). This evaluation has provided a better understanding of the depositional evolution, helping in the prediction of the facies distribution at the reservoir scale and the establishment of the reservoir architecture.
机译：虽然阿拉伯联合酋长国的喀土伯和水碳酸碳酸碳酸烃储层受益于许多调查，使得建立相对准确的生物数据术框架和沉积学，沉积和序列地层背景的表征，较低的lekhwair沉积物仍然知名，并且很少是出版物的话题。这些瓦朗尼亚/豪式（？）（Alsharan和Nairn，1986年;肉装，2000）碳酸盐在陆上阿布扎比地区研究，其中在干净的浅内坡道沉积物内宿主碳气积聚。这些清洁的碳酸碳酸碳酸碳酸碳酸碳酸酯与包含粘土/有机物质 - 易于碳酸盐的非储存器单元均被沉积在远端环境（例如Hassan和Wadowa，1981）中，并且通常被挑选为最大洪水表面（例如Sharland，2001; Strohmenger等人。 ，2006）。然而，直到现在，由于这些非储存岩内缺乏岩体样本，尚未确认或反驳这些解释，这通常由于其储层潜力而导致的岩体通常被丢弃。这项工作包括建立基于四个取心井的详细沉积学描述和岩相样品分析的最下面Lekhwair形成陆上阿布扎比地区的沉积学框架中。已经进行了相片分析，这导致了沉积环境的重建。在核心，标记沉积物变化和核心校准的露出孔记录数据中的关键表面的集成有助于解释跨储层和非储存装置的序列地层框架。综上所述，从一种显性潮间粘土/有机容易发生内坡道沉积在最低Lekhwair到干净Lithocodium / Bacinella丰富，开放和可能的边际内坡道到近端中间斜坡沉积物的向上变化反映了大规模侵相。在C.30-40FT厚的大型岩晶岩/ Bacinella轴承间隔的底部挑选大规模的最大泛水表面，并通过向上回归朝向更受限制和无岩晶钠/肉肝菌的内斜坡沉积物覆盖。发达良好的岩溶表面被解释为序列边界（SB）盖大规模回归阶段。它被粘土/有机的内坡道沉积物覆盖，解释为代表覆盖大规模深化的趋势的基础。较小的lekhwair间隔是较低的lekhwair间隔，包括近端和粘土内斜坡，透沉沉积和清洁内/近端碳酸盐之间的交替。这些替换被认为是通过中间尺度的海平面波动控制，该近距离和粘土的内坡道沉积物被保存在近迁移趋势的基础上，并且在深处条件下形成的清洁碳酸盐（即洪水间隔）。该评估提供了更好地理解沉积演化，帮助预测水库规模的相片分布和建立水库架构。

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