Azimuthal Investigation of a Fractured Carbonate Reservoir

IF 2.1 4区 工程技术 Q3 ENERGY & FUELS
F. Bouchaala, A. Mohamed, M. S. Jouini, Y. Bouzidi, M. Y. Ali
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Abstract

Oil production and enhanced oil recovery in carbonate reservoirs in Abu Dhabi, UAE, are largely affected by fracture systems that control the fluid path and the permeability of reservoirs. Most fracture properties, such as fracture orientations and density, are obtained by interpreting petrophysical data acquired at the wellbores, whereas fracture properties between wells are typically derived from nonzero offset seismic data. However, deriving fracture properties from seismic data is challenging, as it requires a robust methodology and a careful seismic processing procedure. In the current case study, we used the azimuthal amplitude vs. offset (AVAz) method on 3D seismic data acquired in onshore Abu Dhabi, to generate maps of fracture orientation and density in a carbonate reservoir. A sophisticated processing series was carefully performed to increase signal-to-noise ratio (SNR) and preserve seismic amplitudes. The main parameters controlling the AVAz method were investigated and optimized before being applied to the 3D seismic data. The reservoir has a high fracture density in the lower regions, but a low fracture density in the upper parts, indicating a weaker anisotropy. The resulting dominant fracture directions span from north-northwest/south-southwest to north-northeast/south-southwest, as well as from northwest/southeast to east/west, which is consistent with the primary fracture orientations determined from the interpretation of fullbore formation microimager (FMI) data acquired at well locations. These fracture systems are the result of the Late Cretaceous obduction of the Semail ophiolite, which was oriented east/west and northeast/southwest, followed by the south/north to southwest/northeast trending Late Oligocene-Miocene continent-continent collision of the Arabian and Central Iran plates along the Zagros orogenic front.
碳酸盐岩裂缝性储层方位研究
在阿联酋阿布扎比,碳酸盐岩油藏的产量和采收率在很大程度上受到裂缝系统的影响,裂缝系统控制着储层的流体路径和渗透率。大多数裂缝性质,如裂缝方向和密度,都是通过解释在井筒中获得的岩石物理数据获得的,而井间裂缝性质通常来自非零偏移地震数据。然而,从地震数据中获得裂缝属性是具有挑战性的,因为需要稳健的方法和仔细的地震处理程序。在当前的案例研究中,我们对在阿布扎比陆上获得的三维地震数据使用了方位角振幅与偏移量(AVAz)方法,以生成碳酸盐岩储层的裂缝方向和密度图。为了提高信噪比(SNR)并保持地震振幅,进行了一系列复杂的处理。在应用于三维地震资料之前,对控制AVAz方法的主要参数进行了研究和优化。储层下部裂缝密度高,上部裂缝密度低,各向异性较弱。由此得出的优势裂缝方向从西北偏北/西南偏南到东北偏北/西南偏南,以及从西北/东南到东/西,这与井位全孔地层微成象仪(FMI)数据解释确定的主裂缝方向一致。这些断裂系统是晚白垩世塞梅尔蛇绿岩逆冲的结果,其方向为东/西和东北/西南,随后是阿拉伯和伊朗中部板块沿扎格罗斯造山带南/北至西南/东北走向的晚渐新世-中新世大陆-大陆碰撞。
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来源期刊
CiteScore
5.30
自引率
0.00%
发文量
68
审稿时长
12 months
期刊介绍: Covers the application of a wide range of topics, including reservoir characterization, geology and geophysics, core analysis, well logging, well testing, reservoir management, enhanced oil recovery, fluid mechanics, performance prediction, reservoir simulation, digital energy, uncertainty/risk assessment, information management, resource and reserve evaluation, portfolio/asset management, project valuation, and petroleum economics.
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