Seismic Anisotropy of Shale: Inversion of Microseismic Data
Seismic Anisotropy of Shale: Inversion of Microseismic Data
复制标题
页岩地震各向异性：微震数据反演
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
S. Shapiro
中科院分区：
文献类型：
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作者：
Changpeng Yu;S. Shapiro
井下阵列记录的微震数据有望成为原位估计页岩各向异性的一种潜在方法，可用于验证和校准页岩各向异性的实验室实验结果。相反，岩石物理学研究可以在估计和解释微震数据集中页岩的地震各向异性时提供约束。由微震数据得出的页岩固有各向异性与岩石物理实验一致。具有板状颗粒和较软弹性特性的粘土矿物和有机物质显着增加了页岩的固有各向异性，而具有非板状和较硬颗粒的石英含量则大大削弱了页岩的各向异性程度。反汤姆森参数 e 和 γ 彼此有很好的相关性，但与 δ 没有相关性，这也与之前的研究一致。与原始提供的各向异性速度模型相比，具有岩石物理约束的优化各向异性速度模型显着减少了约 65% 的时间失配。
Microseismic data recorded in downhole arrays promise a potential way of estimating in situ shale anisotropy, which can be used to verify and calibrate the results of laboratory experiments on shale anisotropy. Reversely, rock physics studies can provide constraints when estimating and interpreting seismic anisotropy of shale in microseismic dataset. Intrinsic anisotropy of shale derived from microseismic data is consistent with rock physics experiments. Clay mineral and organic material with platy particles and softer elastic properties significantly increase the intrinsic anisotropy of shale, whereas quartz content with non-platy and stiffer grains largely weaken the degree of shale anisotropy. Inverted Thomsen parameters e and γ are well correlated with each other, but not with δ , which also agree with previous studies. The optimized anisotropic velocity model with rock physical constraints remarkably reduces the time misfit by about 65% compared to originally provided anisotropic velocity model.