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

Mona G.SAFA; Bassem S.NABAWY; Ahmed M.K.BASAL; Mohammad A.OMRAN; Aref LASHIN

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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

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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(RQIFZI)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.

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《地质学报：英文版》 |2021年第5期|1746-1762|共17页
作者
Mona G.SAFA; Bassem S.NABAWY; Ahmed M.K.BASAL; Mohammad A.OMRAN; Aref LASHIN;
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作者单位

Geology Department;

Faculty of Science;

Damietta University;

New Damietta City;

Egypt;

Department of Geophysical Sciences;

National Research Centre;

Dokki;

Cairo;

Egypt;

Petroleum and Natural Gas Engineering Department;

College of Engineering;

King Saud University;

Riyadh 11421;

Saudi Arabia;

Benha University;

Faculty of Science;

Geology Department;

Benha;

Egypt;

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原文格式 PDF
正文语种 chi
中图分类矿床学;
关键词
reservoir heterogeneity; nullipore; rock typing; hydraulic flow units; Dykstra-Parsons coefficient; stratigraphic modified Lorenz plot(SMLP);

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

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