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首页> 外文期刊>Arabian journal of geosciences >Porosity evolution within high-resolution sequence stratigraphy and diagenesis framework: outcrop analog of the upper Jurassic Arab-D reservoir, Central Saudi Arabia
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Porosity evolution within high-resolution sequence stratigraphy and diagenesis framework: outcrop analog of the upper Jurassic Arab-D reservoir, Central Saudi Arabia

机译：高分辨率层序地层学和成岩作用框架内的孔隙演化：沙特中部上侏罗统阿拉伯-D储层的露头类似物

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摘要

The upper Jurassic Arab-D reservoir is considered as the most prolific reservoir in the Ghawar field in Saudi Arabia. Exposed strata equivalent to the Arab-D reservoir was investigated and evaluated to establish a relationship between lithofacies, sequence stratigraphy, diagenesis, and porosity evolution within the Arab-D reservoir analog. The study revealed eight lithofacies which interpreted to have been deposited in an open-marine lower-slope and upper-slope of a ramp platform, ramp-crest, distal to proximal lagoon and tidal flat environments. The diagenetic and paragenetic analysis showed early marine dissolution and cementation, followed by replacement of aragonite and high Mg calcite to low Mg calcite. Porosity enhancement started with shoaling-up of the system. This produces most of the moldic and intraporosity in the study area. Although the outcrop section showed a degree of burial compaction, there is no pronounced effect of compaction on porosity reduction. With extensive progradation of the proximal lagoon and inner ramp along with meteoric realm, near-surface dolomitization was formed and resulted in porosity increase. This was very clear at the top of each of the high-frequency sequences of the lower part of the outcrop. Later, the whole system had undergone fracturing which enhanced porosity dramatically. Although, the outcrop has little or no macro porosity due to sub aerial exposure and recent meteoric cementation, the paragenesis study provides a predictive porosity distribution model within a high-resolution sequence stratigraphy framework and its associated diagenetic events. This model could provide better understanding of porosity evolution and valuable guide for subsurface exploration.
机译：侏罗纪上游的阿拉伯-D储层被认为是沙特阿拉伯Ghawar油田中产量最高的储层。研究和评估了与Arab-D油藏相当的裸露地层，以建立Arab-D油藏类似物中岩相，层序地层，成岩作用和孔隙度演化之间的关系。该研究揭示了八个岩相，这些岩相被解释为沉积在斜坡平台，斜坡顶，近泻湖和潮汐平坦环境的开阔海洋低坡和高坡中。成岩作用和共生作用分析表明，海洋溶解和胶结作用较早，随后将文石和高镁方解石替换为低镁方解石。孔隙率的提高始于系统的增加。这会在研究区域产生大部分的霉菌和内部孔隙。尽管露头剖面显示出一定程度的埋藏压实，但压实对降低孔隙率没有明显影响。随着近端泻湖和内部斜坡的广泛发展以及流域，形成了近地表白云石化作用，并导致孔隙度增加。这在露头下部的每个高频序列的顶部非常清楚。后来，整个系统进行了压裂，大大提高了孔隙度。尽管由于近空中暴露和最近的陨石胶结，露头几乎没有孔隙，但共生研究提供了高分辨率层序地层学框架及其相关成岩作用中的预测孔隙度分布模型。该模型可以提供对孔隙演化的更好理解，并为地下勘探提供有价值的指导。

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