利用地震属性和机器学习对JuabarteField(Campos盆地)盐后储层段的断层特征进行表征

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Edimar Perico, H. Bedle, Bobby Buist, A. Damasceno
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引用次数: 0

摘要

地震属性通常用于解释任务。振幅和相位分量的变化揭示了断层,并为油气藏管理提供了见解。研究了不同地震属性对断层识别的影响。数据调节和无监督机器学习方法补充了分析。在Campos盆地北部,利用4D/4C Jubarte永久油藏监测(PRM)系统覆盖的区域,测试了不同算法和参数的影响。与盐后储层相关的地震异常变化揭示了断层和裂缝的存在。然而,地震噪声和具有弱声阻抗的地质单元的对比需要应用额外的方法。谱平衡和构造导向滤波(SOF)提高了部分地层反射面横向连续性,减弱了随机噪声,提高了许多地区断层面的可视性。几何和瞬时地震属性揭示了断层表面的附加特征。不同方位角限制体的对比表明,当采集方向与构造垂直时,可以圈定断层。使用全叠体积计算的属性显示更少的噪声含量和更多的直线故障段。最大正曲率分量和最大负曲率分量表明了主要特征的更多细节,并且具有指示变形带可能的上倾和下倾侧面的优势。大量的地震立方体和属性促使使用主成分分析(PCA)和自组织映射(SOM),它们补充了由结构不连续内排列的特定神经元组成的簇组成的断层段识别。所获得的改进证明了拥有一个结合不同方法的工作流的重要性。对于Jubarte油田,多属性方法在描绘断层的横向延伸和更精确的不连续层定位方面具有优势。最后,指出了地震噪声和地层特征可能对与断层有关的不连续结构的表征产生的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fault characterization in a postsalt reservoir interval, Juabarte Field (Campos Basin) using seismic attributes and machine learning
Seismic attributes are routinely applied for interpretation tasks. Changes in amplitude and phase components reveal faults, and provide insights into hydrocarbon reservoir management. We investigate how different seismic attributes improve the recognition of faults. Data conditioning and unsupervised machine learning methods complement the analysis. The area covered by the 4D/4C Jubarte Permanent Reservoir Monitoring (PRM) system in the northern part of Campos Basin was used to test the impact of different algorithms and parameters. Changes in seismic anomalies associated with post-salt reservoirs reveal the presence of faults and fractures. However, seismic noise and geological units with weak acoustic impedance contrasts required the application of additional methods. Spectral balancing and structure-oriented filtering (SOF) increased the lateral continuity of some stratigraphic reflectors and attenuated random noise, which improved fault surface visibility in many areas. Seismic attributes, both geometric and instantaneous, uncover additional features of fault surfaces. Comparisons between different azimuth-restricted volumes reveal that faults can be delineated when the acquisition direction is positioned perpendicular to structure. Attributes computed using the full-stack volume show less noise content and more rectilinear fault segments. Most-positive and most-negative curvature components indicate more details of major features, and have the advantage of indicating possible up-thrown and down-thrown sides of a deformational zone. The large number of seismic cubes and attributes motivated the use of principal component analysis (PCA) and self-organizing maps (SOM), which complements the identification of faults segments with clusters composed of specific neurons aligned within structural discontinuities. The improvements obtained demonstrated the importance of having a workflow that combines different methods. For the Jubarte Field, a multi-attribute approach demonstrates advantages for delineating the lateral extension of faults and a more precise discontinuity location. Finally, the impact that seismic noise and stratigraphic features may have in the characterization of discontinuities associated with faults was noted.
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来源期刊
CiteScore
2.50
自引率
8.30%
发文量
126
期刊介绍: ***Jointly published by the American Association of Petroleum Geologists (AAPG) and the Society of Exploration Geophysicists (SEG)*** Interpretation is a new, peer-reviewed journal for advancing the practice of subsurface interpretation.
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