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首页> 外文期刊>Journal of African earth sciences >Acoustics and petrophysical investigations on upper cretaceous carbonate rocks from northern Lebanon
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Acoustics and petrophysical investigations on upper cretaceous carbonate rocks from northern Lebanon

机译：来自黎巴嫩北部的上白垩统碳酸盐岩石的声学和岩石物理研究

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Carbonate rocks represent significant aquifers and reservoir rocks in many parts of the world. In this study, twenty-one carbonate samples collected from the exposed rocks at Batroun and Chekka, northern Lebanon, are studied to investigate their lithological characteristics, nannofossil content, and their acoustic and petrophysical properties. Four microfacies are recognized in the studied rocks including packstone, wackstone, wack-mudstone, and the wack-packstone. Nannofossils are detected in the top part of the studied section indicating marine-type depositional conditions for the upper Cretaceous carbonate rocks. The Petrographic analysis revealed also that the studied rocks have moderate to high porosity which is consistent with the measured porosity on core samples. The low porosity of some samples is induced by cementation, which also reduced their permeability. The bulk density varies widely because of the many diagenetic processes that impacted the studied rocks. Moreover, because the primary and secondary wave velocities (Vp, and Vs) are greatly influenced by porosity and density, the samples exhibit extreme variations in acoustic velocities from low values which characterize soft, highly-porous, rocks to higher velocities which are characteristic of compact, massive, and highly-cemented carbonates. Some relationships between the measured petmphysical and acoustic parameters are studied to investigate their mutual dependence, and discuss the impacts of rock composition and diagenetic alterations on the petrophysical properties of the collected rocks. The obtained results are also important in characterizing their mechanical strength, and in the analysis of seismic reflection profiles acquired for equivalent offshore limestone reservoirs in the Levant and the Eastern Mediterranean regions.
机译：碳酸盐岩石代表世界许多地区的重要含水层和水库岩石。在这项研究中，研究了来自黎巴嫩北部的Batroun和Chekka的暴露岩石中收集的二十一碳酸酯样品，研究了它们的岩性特征，Nannofossil含量及其声学和岩石物理性质。在学习的岩石中识别出四种微缩放，包括包装，武器，瓦克 - 泥岩和剑桥。在研究区段的顶部检测到Nannofossils，该剖面表明上白垩纪碳酸盐岩石的海洋型沉积条件。岩体分析揭示了所研究的岩石具有中度至高孔隙率，这与核心样品上的测量孔隙率一致。通过胶结诱导一些样品的低孔隙率，这也降低了它们的渗透性。由于影响所研究的岩石，散装密度随着许多划分的岩石而变化。此外，由于初级和次级波速度（VP和VS）受到孔隙率和密度的大大影响，所以样品对来自柔软，高孔，岩石的低值的声速显示出极端变化，以至于具有更高的速度紧凑，大规模和高碳酸盐。研究了测量的PETMPHYSICAL和声学参数之间的一些关系，以研究它们的相互依赖性，并讨论岩石组合物和成岩改变对收集岩石的岩石物理性质的影响。所得的结果在表征其机械强度方面也很重要，并且在黎凡和东地中海地区的等同海上石灰岩储层获得的地震反射曲线分析。

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