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首页> 外文期刊>Journal of South American earth sciences >Basic and specialized geophysical well logs to characterize an offshore carbonate reservoir in the Campos Basin, southeast Brazil
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Basic and specialized geophysical well logs to characterize an offshore carbonate reservoir in the Campos Basin, southeast Brazil

机译：基本和专门的地球物理测井曲线，以表征巴西东南部坎波斯盆地的一个海上碳酸盐岩储层

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Assessing the geometry, flow dynamics and, petrophysical properties, of a carbonate reservoir has been a key task for a long time, but the challenges presented by these highly heterogeneous rocks seem endless. Geophysical well logs have been, over this time, a very important tool in this type of evaluation. The applications of logs, in the evaluation of the geological formations, range from the estimation of lithology, porosity, permeability and mechanical properties. Commonly, logs are classified as basic or special. The basic logs, used in this work, are the gamma ray, resistivity, density, neutron and sonic. The special ones, utilized in the study, are the acoustic image and the photoelectric logs. From the analysis of the basic logs, the lithologies were identified, the reservoir was delimited and zoned, the fluids and the contact between them were identified and, petrophysical properties, as porosity and water saturation, were estimated. The total porosity was estimated using the empirical relationships from density, neutron and, sonic logs. The identification of the porosity type, such as fractures, vugs etc., although, was determined from the acoustic image borehole wall, as well as different geological structures, such as lithological contacts, inclined layers, natural and induced fractures, besides the identification of caves. The photoelectric log helped to identify the different lithologies, which were compared with those derived from the basic logs. Thus, the main objective of this work was the joint use of the basic and specialized logs, in the characterization of a carbonate reservoir in the Campos Basin, using real data from the post - salt layer. In the end, the advantages and disadvantages, in the usage of these tools, were indicated, as considerably as the applications and care with the occurrence of no geological structures. The joint use of the data and, the adopted methodology proved effective in the characterization of this reservoir.
机译：长期以来，评估碳酸盐岩储层的几何形状，流动动力学和岩石物理特性一直是一项关键任务，但是这些高度非均质岩石所带来的挑战似乎是无止境的。在此期间，地球物理测井记录一直是此类评估中非常重要的工具。测井在评估地质构造方面的应用范围包括对岩性，孔隙度，渗透率和力学性质的估计。通常，日志分为基本日志或特殊日志。在这项工作中使用的基本测井曲线是伽马射线，电阻率，密度，中子和声波。在研究中使用的特殊的是声像和光电测井。通过对基本测井资料的分析，确定了岩性，对储层进行了划定和分区，确定了流体及其之间的接触，并估算了岩石物性，如孔隙度和含水饱和度。总孔隙率是根据密度，中子和声波测井的经验关系估算的。但是，孔隙度类型的识别，例如裂缝，孔洞等，是根据声像钻孔壁以及不同的地质结构（如岩性接触，倾斜层，自然裂缝和诱发裂缝）确定的。洞穴。光电测井有助于识别不同的岩性，并将其与从基本测井得到的岩性进行比较。因此，这项工作的主要目的是使用坎普斯盆地的碳酸盐岩储层的真实数据，结合基础和专业测井资料，利用后盐层的真实数据。最后，指出了使用这些工具的利弊，以及在没有地质构造的情况下的应用和关注。数据的共同使用以及所采用的方法论证明对该储层的表征有效。

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