Detailed study of seismic wave attenuation from four oilfields in Abu Dhabi, United Arab Emirates
Detailed study of seismic wave attenuation from four oilfields in Abu Dhabi, United Arab Emirates
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阿拉伯联合酋长国阿布扎比四个油田地震波衰减的详细研究
DOI：
10.1088/1742-2140/aa9a08
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发表时间：
2018
影响因子：
1.4
通讯作者：
J. Matsushima
中科院分区：
文献类型：
--
作者：
Bouchaala;F.;M.Y. Ali;J. Matsushima
在目前的研究中，我们提供了一个详细的研究，地震波衰减从四个油田。这些油田的储集层由于复杂的裂缝网络、沥青垫的存在和碳酸盐岩的高度非均质性而复杂，阿布扎比的地下主要由碳酸盐岩组成。这些复杂性降低了信噪比并使衰减估计变得困难。我们从垂直地震剖面（VSP）和声波波形数据获得了高分辨率的衰减剖面。在四个油田均记录了VSP资料，在I、IV油田的储层中采集了声波资料。在400-3500米深度范围内，VSP散射衰减在-0.080到0.180之间变化。我们把这种显著的散射归因于碳酸盐岩的高度非均质性。散射剖面似乎对裂缝、岩性非均质性和沥青垫敏感，但它们的影响是叠加的。VSP固有衰减在-0.15到0.246之间变化，在每个地层内变化很大。由于固有衰减与流体密切相关，我们假设这种变化是由于地下复杂的孔隙网络引起的流体的不均匀分布。储层中声波衰减范围为0.033-0.094，偶极线衰减范围为0.040-0.138。声波衰减似乎对流体的存在和裂缝的类型敏感，其中它显示开放裂缝的高衰减和电阻裂缝的低衰减。二号油田储层中粘土含量高的带，声波固有衰减高。我们解释这是由于这两种材料的弹性差异，粘土和碳酸盐岩之间的摩擦运动。因此，固体颗粒摩擦可能是这些区域的主要衰减机制。
In the present study, we provide a detailed study of seismic wave attenuation obtained from four oilfields. The reservoir zones of these oilfields are complicated due to complex fracture networks, the presence of tar mat and high heterogeneity of carbonate rocks of which the subsurface of Abu Dhabi is mainly composed. These complexities decrease signal-to-noise ratio and make attenuation estimation difficult. We obtained high-resolution attenuation profiles from vertical seismic profiling (VSP) and sonic waveform data. The VSP data were recorded in all four oilfields and the sonic data were acquired in the reservoir zones of oilfields I and IV. We found that the VSP scattering attenuationvaries from -0.080 to 0.180 over a depth range of 400–3500 m. We attributed this significant scattering to the high heterogeneity of carbonate rocks. The scattering profiles seem to be sensitive to fractures, lithology heterogeneity and tar mat, but their effect is superimposed. The VSP intrinsic attenuation varies from -0.15 to 0.246 with high variation within each formation. Since intrinsic attenuation is closely related to fluids, we assumed that this variation is due to the non-uniform distribution of fluids caused by the complex porosity network of the subsurface. The sonic monopole attenuationin the reservoir zones ranges between 0.033–0.094 and dipole inline attenuationranges from 0.040–0.138. The sonic attenuation appears to be sensitive to the presence of fluid and type of fractures, where it shows high attenuation for open fractures and low attenuation for resistive fractures. The zones with high clay content display high sonic intrinsic attenuation in the reservoir of oilfield II. We explain this by the frictional movement between the clay and carbonates due to the elasticity contrast of these two materials. Therefore, the solid grain friction may be the dominant attenuation mechanism in those zones.
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