Crack fluid identification of shale reservoir based on stress-dependent anisotropy

Zhang Jia-Jia; Zhang Guang-Zhi; Huang Lan-Hua

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Crack fluid identification of shale reservoir based on stress-dependent anisotropy

机译：基于应力相关各向异性的页岩储层裂缝流体识别

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Shale reservoirs are typically very tight, and crack are only a small part of the reservoir. The directional arrangement of cracks leads to the anisotropic characteristics of shale, and the type of fluid filled in cracks affects the shale reservoir evaluation and late development. Many rock physics theories and methods typically use second- and fourth-order crack density tensors to characterize the elastic anisotropy induced by cracks as well as the normal-to-tangential crack compliance ratio to distinguish between dry and saturated cracks. This study defines an anisotropic crack fluid indicator for vertical transversely isotropy (VTI) media with vertical symmetry axis which is the integration of the normal-to-tangential crack compliance ratio in three directions. A new dimensionless fourth-order tensor, including crack fluid type, azimuth distribution, and geometric shape, is constructed by substituting the normal and tangential compliance into the fourth-order crack density tensor, which can also be used to identify the type of crack fluid in the VTI media. Using the Callovo–Oxfordian shale experimental data, the variation of the elastic properties of dry and saturated shale samples with axial stress is analyzed. The results demonstrate that the anisotropic crack fluid indicator of water-bearing shale samples is less than that of the dry shale samples and that the dimensionless fourth-order tensor of water-bearing shale samples is nearly one order of magnitude greater than that of the dry shale samples. Therefore, the anisotropic crack fluid indicator and dimensionless fourth-order tensor can reflect the crack fluid type in shale samples and can be used for shale reservoir prediction and fluid identification.

机译：页岩储层通常非常紧，裂缝只是储层的一小部分。裂缝的定向排列导致页岩具有各向异性特征，裂缝中填充的流体类型影响页岩储层的评价和后期开发。许多岩石物理学理论和方法通常使用二阶和四阶裂纹密度张量来表征由裂纹引起的弹性各向异性以及法向与切向裂纹的顺应比，以区分干裂纹和饱和裂纹。这项研究为具有垂直对称轴的垂直横向各向同性（VTI）介质定义了各向异性裂缝流体指标，该指标是三个方向上法向切向顺应裂缝比率的积分。通过将法向和切向柔量代入四阶裂缝密度张量，构造了一个新的无量纲四阶张量，包括裂缝流体的类型，方位角分布和几何形状。也可以用于识别裂缝流体的类型在VTI媒体中。利用Callovo–Oxfordian页岩实验数据，分析了干燥和饱和页岩样品的弹性特性随轴向应力的变化。结果表明，含水页岩样品的各向异性裂缝流体指标小于干页岩样品的各向异性裂缝流体指标，含水页岩样品的无量纲四阶张量比干页岩样品大四倍。页岩样品。因此，各向异性裂缝流体指示剂和无量纲四阶张量可以反映页岩样品中的裂缝流体类型，可用于页岩储层预测和流体识别。

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《应用地球物理（英文版）》 |2019年第2期|209-217|共9页
作者
Zhang Jia-Jia; Zhang Guang-Zhi; Huang Lan-Hua;
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作者单位

School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China;

Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;

School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China;

Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;

School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China;

Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;

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Crack fluid identification of shale reservoir based on stress-dependent anisotropy

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