摘要：At present, most studies have considered partial saturation and aligned fractures separately. However, these two phenomena exist simultaneously in most fractured reservoirs, such as carbonate reservoirs and tight sandstone reservoirs. In this paper, we develop a periodically layered model with alternating fractured layer saturated with gas and water-bearing porous layer to simultaneously model partial saturation and aligned fractures, which is an equivalent viscoelastic vertical transversely isotropic medium. We assume that the two types of attenuation are independent of each other. Firstly, we analyze the phase velocities and attenuation coefficients of quasi-P (P) and quasi-S (S) waves with frequency and incident angle, when the thickness fraction of fractured layer is 0.5. It shows that the attenuation coefficients of P-wave are much greater than the S-wave, when the incident angle is smaller than 30 degrees. Then we analyze the frequency-dependent characteristics of the P-wave with different thickness of the fractured layer related to gas saturation. The attenuation of P-wave increases significantly with gas saturation in the frequency band from 10 to 100 Hz. Finally, we re-derived the frequency-dependent amplitude versus offset equation of anisotropic media to analyze the dispersion characteristics of the P-wave reflection coefficients. The reflection magnitude decreases with frequency and the reflection coefficients show significant anisotropy at high gas saturation. The dispersion and attenuation of P-wave largely depends on the gas saturation.

关键字：frequency-dependent attributes fracture partial saturation dispersion anisotropy

ISSN号：1742-2132

卷、期、页：卷: 15 期: 5 页: 1943-1952

发表日期：2018-10-01

影响因子：0.994000

期刊分区（SCI为中科院分区）：四区

收录情况：SCIE（科学引文索引网络版）,ESI（基本科学指标数据库）

发表期刊名称：Journal of Geophysics and Engineering

参与作者：Liu, Yuanyuan

通讯作者：秦喜林

第一作者：李向阳,陈双全

论文类型：期刊论文

论文概要：秦喜林,李向阳,陈双全,Liu, Yuanyuan，The modeling and analysis of frequency-dependent characteristics in fractured porous media，Journal of Geophysics and Engineering，2018，卷: 15 期: 5 页: 1943-1952

论文题目：The modeling and analysis of frequency-dependent characteristics in fractured porous media