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Acoustic image log facies and well log petrophysical evaluation of the Barra Velha Formation carbonate reservoir from the Santos Basin, offshore Brazil
Carbonates and Evaporites ( IF 1.4 ) Pub Date : 2022-06-30 , DOI: 10.1007/s13146-022-00791-4
Mateus Basso, João Paulo Ponte Souza, Bruno César Zanardo Honório, Leandro Hartleben Melani, Guilherme Furlan Chinelatto, Aline Maria Poças Belila, Alexandre Campane Vidal

The Barra Velha Formation encompasses the most important hydrocarbon reservoirs of the Pre-salt section of the Santos Basin, SE Brazil, and its lacustrine carbonates have drawn much attention in the past decade due to their sedimentological complexity and overall heterogeneity. Among the main challenges in the characterization of such rocks are the great depth of the reservoirs and the difficulty to characterize geological features in non-cored intervals. Additionally, the relationship between facies and petrophysical properties is difficult to establish with conventional well log evaluation routines. In this study, a continuous ultrasonic borehole image log (UBI) is integrated with conventional logs, nuclear magnetic resonance logs (NMR), and core samples to support the detailed geological interpretation and petrophysical evaluation of the lacustrine carbonates of the Barra Velha Formation (wholly Aptian). The systematic interpretation of the UBI log resulted in the identification of acoustic image log facies (AIFs), which were then translated into lithofacies. The entire studied interval was divided into eight zones, characterized by particular facies associations and petrophysical properties. Each zone was interpreted to have formed in depositional environments ranging from deep subaqueous to emergent conditions. A general shallowing and cleaning upward pattern was identified for the Barra Velha Formation, with a main reservoir zone associated with intermediate-to-shallow subaqueous conditions. This work aimed to explore the applications and limitations of the acoustic image log in the context of the Brazilian pre-salt and establish the relationship between image log facies and reservoir properties retrieved from NMR data.



中文翻译:

巴西近海桑托斯盆地 Barra Velha 组碳酸盐岩储层的声学图像测井相和测井岩石物理评价

Barra Velha 组包含巴西东南部桑托斯盆地盐下段最重要的油气藏,其湖泊碳酸盐岩因其沉积学复杂性和整体非均质性在过去十年中备受关注。表征此类岩石的主要挑战之一是储层深度大,以及难以表征非取芯层段的地质特征。此外,使用常规测井评估程序难以建立相和岩石物理性质之间的关系。在这项研究中,连续超声钻孔图像测井 (UBI) 与常规测井、核磁共振测井 (NMR)、和岩心样本,以支持对 Barra Velha 组(全是 Aptian)的湖相碳酸盐进行详细的地质解释和岩石物理评估。UBI 测井的系统解释导致声像测井相 (AIF) 的识别,然后将其转化为岩相。整个研究区间分为八个区域,以特定的相组合和岩石物理特性为特征。每个区域都被解释为在从深水下到涌现条件的沉积环境中形成。确定了 Barra Velha 组的总体变浅和向上清理模式,主要储层带与中水至浅水条件相关。

更新日期:2022-06-30
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