Abstract We present a large dataset of average porosity, depth, thickness and well locations for one of the Earth's major oil-bearing limestone reservoirs and discuss possible controlling factors. Petrologic data are not included in this study, but regional petrology data from earlier studies and detailed results from one representative oilfield provide a useful basis for interpretation of the present compilation. Porosity decreases with depth similar to porosity-depth trends from other limestone strata, but the main data cluster, representing the largest fields in the depth range 7000–9500 ft (2134–2896 m), follows a much steeper trend approximately parallel with the crest-flank trends of individual fields where crestal porosity has apparently been preserved by early arrival of oil. Maps of depth, porosity, thickness, and departure of porosity from the overall trend illustrate the geographic variation of these parameters. Solidity (thickness with porosity removed) is constant from crest to flanks in the largest fields, indicating that crest-flank porosity differentiation took place by closed-system compaction and cementation. The principal value created by this work is the framework established for focusing continuing studies that can further constrain the controlling processes and thus develop predictive tools for this particular reservoir and similar micropore-dominated limestones worldwide.

中文翻译：

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阿布扎比Thamama-B储层区域孔隙度变化

摘要 我们提供了地球主要含油石灰岩储层之一的平均孔隙度、深度、厚度和井位的大型数据集，并讨论了可能的控制因素。本研究不包括岩石学数据，但早期研究的区域岩石学数据和一个代表性油田的详细结果为解释本汇编提供了有用的基础。孔隙度随深度减小，类似于来自其他石灰岩地层的孔隙度-深度趋势，但代表深度范围 7000-9500 英尺（2134-2896 米）内最大区域的主要数据集群遵循更陡峭的趋势，大致平行于顶部- 单个油田的侧翼趋势，其中顶部孔隙度显然因石油的早期到达而得以保留。深度、孔隙度、厚度图，孔隙度与总体趋势的偏离说明了这些参数的地理变化。在最大油田中，从顶部到侧翼的密实度（去除孔隙的厚度）是恒定的，这表明顶部 - 侧翼的孔隙度分化是通过封闭系统压实和胶结发生的。这项工作创造的主要价值是为集中持续研究建立的框架，可以进一步限制控制过程，从而为这个特定的储层和世界范围内类似的微孔主导的石灰岩开发预测工具。表明顶部-侧面孔隙度差异是通过封闭系统压实和胶结发生的。这项工作创造的主要价值是为集中持续研究建立的框架，可以进一步限制控制过程，从而为这个特定的储层和世界范围内类似的微孔主导的石灰岩开发预测工具。表明顶部-侧面孔隙度差异是通过封闭系统压实和胶结发生的。这项工作创造的主要价值是为集中持续研究建立的框架，可以进一步限制控制过程，从而为这个特定的储层和世界范围内类似的微孔主导的石灰岩开发预测工具。