Abstract

Subdividing the reservoir sequences into some hydraulic flow units (HFUs) is one of the most serious challenges that face reservoir characterization and modeling in the oil industry. It may be a complicated process due to the heterogeneous nature of the hydrocarbons-bearing reservoirs, in particular in the case of non-clastic reservoirs. The stratigraphic modified Lorenz plot (SML) is one of the most important techniques that can be applied to subdivide the reservoir sequence into HFUs. It is based on an estimation of the flow and storage capacity of the studied sequence in an accumulative manner. Though the ability of the SML technique to slice the reservoir into HFUs; it roughly indicates the efficiency of the HFUs based on the slope range of each HFU line segment. In the present study, an improvement is proposed to accurately describe the efficiency of the discriminated HFUs based on estimating their slope angles using two proposed graphical and mathematical methods. The graphical method is a quick and practical one, while the other mathematical method is more accurate. The proposed methods were tested using the available data from 6 wells; in which four clastic and two carbonate reservoirs were sampled and subdivided into HFUs using the common SML technique and the efficiency of each HFU was measured using the proposed ISML technique.

Article highlights

1. 1.

   Subdividing a given reservoir into hydraulic flow units is one of the most serious challenges.

2. 2.

   Stratigraphic Modified Lorenz plot is commonly applied to subdivide the reservoir rocks into HFUs.

3. 3.

   It is proposed to add a description for the HFUs efficiency in the SML plot using a graphical and mathematical technique.

4. 4.

   This improved SML plot (ISML) was verified using the available clastic and non-clastic core data from 6 wells.

中文翻译：

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改进的地层修正洛伦兹 (ISML) 图作为描述碎屑和非碎屑储层序列中水力流动单元 (HFU) 效率的工具

摘要

将油藏序列细分为一些水力流动单元 (HFU) 是石油工业中油藏表征和建模面临的最严峻挑战之一。由于含烃储层的非均质性，这可能是一个复杂的过程，特别是在非碎屑岩储层的情况下。地层修正洛伦兹图 (SML) 是最重要的技术之一，可用于将储层序列细分为 HFU。它基于以累积方式对所研究序列的流量和存储容量的估计。尽管 SML 技术能够将储层切成 HFU；它根据每个 HFU 线段的斜率范围粗略地表示 HFU 的效率。在目前的研究中，基于使用两种建议的图形和数学方法估计它们的倾斜角，提出了一种改进来准确描述被区分的 HFU 的效率。图形方法是一种快速实用的方法，而另一种数学方法更准确。使用来自 6 口井的可用数据对所提出的方法进行了测试；其中使用常见的 SML 技术对四个碎屑岩和两个碳酸盐岩储层取样并细分为 HFU，并使用建议的 ISML 技术测量每个 HFU 的效率。使用来自 6 口井的可用数据对所提出的方法进行了测试；其中使用常见的 SML 技术对四个碎屑岩和两个碳酸盐岩储层取样并细分为 HFU，并使用建议的 ISML 技术测量每个 HFU 的效率。使用来自 6 口井的可用数据对所提出的方法进行了测试；其中使用常见的 SML 技术对四个碎屑岩和两个碳酸盐岩储层进行采样并细分为 HFU，并使用建议的 ISML 技术测量每个 HFU 的效率。

文章亮点

1. 1.

   将给定的水库细分为液压流量单元是最严峻的挑战之一。

2. 2.

   地层修正洛伦兹图通常用于将储层岩石细分为 HFU。

3. 3.

   建议使用图形和数学技术在 SML 图中添加对 HFU 效率的描述。

4. 4.

   使用来自 6 口井的可用碎屑和非碎屑岩心数据验证了这种改进的 SML 图 (ISML)。