Implementation of a Petrographical and Petrophysical Workflow Protocol for Studying the Impact of Heterogeneity on the Rock Typing and Reservoir Quality of Reefal Limestone: A Case Study on the Nullipore Carbonates in the Gulf of Suez,Acta Geologica Sinica-English Edition

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Implementation of a Petrographical and Petrophysical Workflow Protocol for Studying the Impact of Heterogeneity on the Rock Typing and Reservoir Quality of Reefal Limestone: A Case Study on the Nullipore Carbonates in the Gulf of Suez
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-03-30 , DOI: 10.1111/1755-6724.14700
Mona G. SAFA ₁ , Bassem S. NABAWY ₂ , Ahmed M.K. BASAL ₁ , Mohammad A. OMRAN ₁ , Aref LASHIN _{3,

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Affiliation

This study focuses on the heterogeneity of the middle Miocene syn-rift Belayim nullipore (reefal) marine sequences in the Gulf of Suez and its impacts on reservoir quality. The sequences consist of coralline algal reef limestones with a highly complex dual-porosity system of primary and secondary porosities of widely varying percentages. To achieve a precise mathematical modeling of these reservoir sequences, a workflow protocol was applied to separate these sequences into a number of hydraulic flow units (HFUs) and reservoir rock types (RRTs). This has been achieved by conducting a conventional core analysis on the nullipore marine sequence. To illustrate the heterogeneity of the nullipore reservoir, the Dykstra-Parsons coefficient (V) has been estimated (V = 0.91), indicating an extremely heterogeneous reservoir. A slight to high anisotropy (λ_k) has been assigned for the studied nullipore sequences. A stratigraphic modified Lorenz plot (SMLP) was applied to define the optimum number of HFUs and barriers/baffles in each of the studied wells. Integrating the permeability-porosity, reservoir quality index-normalized porosity index (RQI-NPI) and the RQI-flow zone indicator (RQI-FZI) plots, the discrete rock types (DRT) and the R₃₅ techniques enable the discrimination of the reservoir sequences into 4 RRTs/HFUs. The RRT4 packstone samples are characterized by the best reservoir properties (moderate permeability anisotropy, with a good-to-fair reservoir quality index), whereas the RRT1 mudstone samples have the lowest flow and storage capacities, as well as the tightest reservoir quality.

中文翻译：

实施岩石学和岩石物理工作流程协议，研究非均质性对珊瑚灰岩的岩石类型和储层质量的影响：以苏伊士湾的 Nullipore 碳酸盐为例

本研究侧重于苏伊士湾中中新世同裂谷 Belayim nullipore（珊瑚礁）海相序列的非均质性及其对储层质量的影响。这些层序由珊瑚藻礁石灰岩组成，具有高度复杂的双重孔隙系统，其中原生和次生孔隙率差异很大。为了实现对这些储层序列的精确数学建模，应用工作流协议将这些序列分成多个水力流动单元 (HFU) 和储层岩石类型 (RRT)。这是通过对无效孔海洋序列进行常规岩心分析来实现的。为了说明无效孔隙储层的非均质性，我们估计了 Dykstra-Parsons 系数 ( V ) ( V= 0.91)，表明极其非均质的储层。已为研究的无效孔序列指定了轻微到高的各向异性 ( λ _k )。应用地层修正洛伦兹图 (SMLP) 来定义每个研究井中 HFU 和屏障/挡板的最佳数量。整合渗透率-孔隙度、储层质量指数-归一化孔隙度指数(RQI-NPI)和 RQI-流带指标(RQI-FZI)图、离散岩石类型(DRT)和 R ₃₅技术能够将储层序列区分为 4 个 RRT/HFU。RRT4 泥岩样品的储层特性最好（中等渗透率各向异性，储层质量指数良好至一般），而 RRT1 泥岩样品具有最低的流动和储存能力，以及最致密的储层质量。

更新日期：2021-03-30

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