Dual pore system evaluation of Albian grainstone carbonates from Brazil using effective elastic media theory models
Dual pore system evaluation of Albian grainstone carbonates from Brazil using effective elastic media theory models
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使用有效弹性介质理论模型评价巴西阿尔布阶粒岩碳酸盐的双孔隙系统
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发表时间：
2013
期刊：
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通讯作者：
Lucas C. Oliveira
中科院分区：
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作者：
I. L. Neto;R. Misságia;M. Ceia;N. Archilha;Lucas C. Oliveira
碳酸盐岩是巴西深水石油生产的重要组成部分，随着盐后和盐下油藏的发现，碳酸盐岩的重要性日益增加。碳酸盐岩通常具有非均质孔隙系统的特点，具有复杂的孔隙结构，孔径大小和形状各异。这项工作旨在通过实验室评估和岩石物理建模来研究巴西Campos盆地海上的颗粒岩碳酸盐岩（Albian-age），以预测超声和干燥条件下双孔隙系统方法的颗粒间长径比和定量分数。目标是利用有效弹性介质（EEM）理论——KT （Kuster-Toksoz）、SC（自一致）和DEM（微分有效介质），以及球形包裹体或微孔为主的孔隙系统，考虑溶瘤/鲕粒岩的粒间孔隙度，估计弹性模量。结果表明，KT和DEM与Albian颗粒岩碳酸盐的结构配伍性最好。颗粒间长径比的估算和包裹体效应的定量预测有助于我们了解Albian碳酸盐的弹性性质。
Summary Carbonates represent a significant portion of the Brazil’s deepwater oil production, whose importance has increased with recent discoveries in the post-salt and pre-salt oil deposits. Often carbonates are characterized by a heterogeneous pore system, displaying a complex pore structure with wide range of pore sizes and shapes. This work aims towards investigating grainstone carbonates (Albian-age) of the offshore Campos Basin, Brazil by laboratorial evaluation and rock physics modeling to predict interparticle aspect ratio and quantitative fractions of a dual pore system approach under ultrasonic and dry conditions. The goal is to estimate elastic moduli considering intergranular porosity expected in oncolytic/oolitic grainstones using Effective Elastic Media (EEM) theories - KT (Kuster-Toksoz), SC (Self-consistent) and DEM (Differential Effective Medium), and either a spherical inclusions or a microporosity dominated pore system. The results show that the KT and DEM give a best compatibility with the texture of the Albian grainstone carbonates. Interparticle aspect ratio estimation and a quantitative prediction of the inclusion effects helped us to understand the elastic properties of Albian carbonates.