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首页> 外文期刊>Journal of Petroleum Geology >FACIES HETEROGENEITIES AND 3D POROSITY MODELLING IN AN OLIGOCENE (UPPER CHATTIAN) CARBONATE RAMP, SALENTO PENINSULA, SOUTHERN ITALY
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FACIES HETEROGENEITIES AND 3D POROSITY MODELLING IN AN OLIGOCENE (UPPER CHATTIAN) CARBONATE RAMP, SALENTO PENINSULA, SOUTHERN ITALY

机译：在南部的寡核苷酸（上锥形）碳酸盐渣中的相似之处和3D孔隙度建模，意大利南部Salento半岛

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>Appraisal of the volumes of fluid in a carbonate reservoir will typically require a reliable predictive model. This can be achieved by combining studies of well‐exposed carbonate successions with 3D models in order to obtain reliable quantitative data. In this paper, we present a detailed outcrop study and a 3D porosity model of a well‐exposed Oligocene carbonate ramp (Salento Peninsula, southern Italy) to investigate the nature of small‐scale facies and porosity heterogeneities. Porosity and permeability in the ramp carbonates appear to be controlled by the original mineralogy of skeletal components and by depositional textures. The aims of the study were therefore to identify the factors controlling porosity development in an undeformed carbonate ramp; to model the scale‐dependent heterogeneities characteristic of the facies associations; and finally to produce a 3D model of the porosity distribution. >The upper Chattian Porto Badisco Calcarenite which crops out along the coast of the Salento Peninsula consists of six lithofacies ranging from inner ramp deposits to fine‐grained outer ramp calcarenites. The lithofacies are: inner ramp small benthic foraminiferal wackestone‐packstones associated with (i) sea grass meadows (SG) and (ii) coral mounds (CM) consisting of coral bioconstructions with a floatstone/packstone matrix; middle ramp (iii) large rotaliid packstones to wackestone‐packstones (LR), (iv) rhodolith floatstone‐rudstones (RF), and (v) large lepidocyclinid packstones (LL); and (vi) outer ramp fine‐grained bioclastic calcarenites (FC). A total of 38 samples collected from six stratigraphic sections (A, B, D, J, E, LO), measured in the Porto Badisco ravine, were investigated to discriminate the types of porosity. Effective and total porosity was measured using a helium pycnometer. The 3D porosity modelling was performed using PETREL? 2016 software (Schlumberger). >Four main types of porosity were recognized in the carbonates: interparticle, intraparticle, vuggy and mouldic. Primary porosity (inter‐ and intraparticle) is limited to middle ramp lithofacies (LL and LR) and outer ramp lithofacies (FC), whereas secondary porosity (vuggy and mouldic) was present in both inner ramp lithofacies (CM and SG) and middle ramp red algal lithofacies (RF). >In the Porto Badisco carbonates, stratigraphic complexity and the distribution of primary porosity are controlled by lateral and vertical variations in depositional facies. Significant secondary porosity was produced by the dissolution of aragonitic and high‐magnesium calcite components, which are dominant in the sea‐grass and coral mound facies of the inner ramp and in the rhodolith floatstone‐rudstones of the middle ramp. >3D models were developed for both effective and total porosity distribution. The porosity models show a clear correlation with facies heterogeneities. However of the two models, the effective porosity model shows the best correlation with the 3D facies model, and shows a general increase in effective porosity basinwards in the middle ramp facies.
机译： >碳酸盐储层中的流体体积的评估通常需要可靠的预测模型。这可以通过与3D模型的曝光良好的碳酸盐继承的研究相结合来实现，以获得可靠的定量数据。在本文中，我们介绍了详细的露出露天研究和露出少寡烯碳酸盐斜坡（Salento Peninsula，Southeral）的3D孔隙度模型，以研究小规模相和孔隙率异质性的性质。斜坡碳酸盐中的孔隙率和渗透性似乎受到骨骼成分的原始矿物质和沉积纹理的控制。因此，该研究的目的是鉴定控制未变形碳酸盐坡道孔隙率发育的因素;模拟相关联的尺度相关的异质性;最后产生孔隙度分布的3D模型。 >沿着Salento半岛海岸散发的Badisco钙质的上部Chattian Porto Badisco Calcarenite由六个岩石缩放物组成，从内斜坡沉积物到细粒度的外斜坡钙质。锂外纳米：内斜坡小型底栖火炮瓦尾瓦斯托酮 - 包装酮与（i）海草草甸（SG）和（ii）珊瑚土墩（cm）组成，由浮石/包装矩阵组成;中坡道（iii）大型旋转圆形包装，Wackestone-packstones（LR），（iv）rhodolith Floatstone-Rudstones（RF）和（v）大型鳞片状萘啶p包（LL）; （vi）外斜坡细粒细菌生物耦合钙（Fc）。研究了在波尔图Badisco Ravine中测量的六个地层部分（A，B，D，J，E，LO）中收集的38个样本，以辨别孔隙率的类型。使用氦pycnomet计测量有效和总孔隙率。使用Petrel进行3D孔隙率建模？ 2016软件（Schlumberger）。 在碳酸盐中识别出四种主要类型的孔隙率：颗粒，骨质，vuggy和牙齿。初级孔隙率（间骨质和骨质粒细胞）限于中坡锂（LL和LL和LR）和外斜坡锂锂（FC），而二级孔隙率（vuggy和牙齿）存在于内斜坡（CM和SG）和中间斜坡中存在红藻锂缺口（rf）。 在波提沙碳酸盐中，地层复杂性和主孔隙率的分布由沉积相的横向和垂直变化控制。通过溶解的杂质和高镁脑料组分的溶解产生了显着的二级孔隙率，这些组分在内斜坡的海草和珊瑚土墩中占主导地位，并且在中间坡道的罗达底漂浮石 - Rudstones中。

3D模型是为有效和总孔隙度分布而开发的。孔隙率模型显示出与相异质性的明显相关性。然而，在这两种模型中，有效的孔隙度模型显示了与3D相模型的最佳相关性，并且显示了中间舷窗中有效孔隙度底盘的一般增加。

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