期刊
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
卷 147, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijrmms.2021.104910
关键词
Tight rocks; S-Wave attenuation; Partial saturation; Model prediction; Mechanism analysis
资金
- Specially-Appointed Professor Program of Jiangsu Province of China
- Jiangsu Province Innovation and Entrepreneurship Plan of China
- National Natural Science Foundation of China [41974123, 41704109]
- Fundamental Research Funds for the Central Universities [B210203039]
- China Scholarship Council [201906710129]
S-wave attenuation in porous media is influenced by the presence and properties of saturating fluids. This study measured the ultrasonic S-wave velocities and attenuation of three types of tight rocks under partial fluid saturation conditions, finding that different types of rocks exhibit varying attenuation characteristics at different fluid saturation levels.
S-wave attenuation in porous media is affected by the presence and properties of saturating fluids. We measured the ultrasonic S-wave velocities of three types of tight rocks (siltstone, dolomite, and sandstone) under partial fluid saturation conditions using the pulse-transmission technique. The S-wave attenuation is estimated by the centroid frequency shift and spectral-ratio methods. The fluid-saturated test results show that the attenuation of most water-saturated dolomites is stronger than that of gas- or oil-saturated dolomites, whereas no apparent relationship exists between attenuation and fluid type in siltstone. The attenuation of siltstone and dolomite increases with increasing porosity and permeability, as well as with clay content for siltstone with clay contents less than 6%. The maximum attenuation of rocks partially saturated with gas and water occurs at high water saturation (55%-100%) in most siltstones. The attenuation of most dolomites shows an increasing trend with water saturation, but remains nearly unchanged in partially saturated sandstone. The attenuation of rocks partially saturated with oil and water is strongest at the partial saturation state in siltstone, but remains essentially constant with water saturation in dolomite. A squirt flow model is used to predict the S-wave attenuation of the fluid-saturated sample. Based on rock property and microstructure analyses, wave attenuation in the fluid-saturated rocks measured in this study can be explained by squirt flow mechanisms and the scattering effect owing to heterogeneities of water patches and grain clusters.
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