| 含流体砂岩地震波频散实验研究 |
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| 引用本文： | 未晛,王尚旭,赵建国,唐跟阳,邓继新.含流体砂岩地震波频散实验研究[J].地球物理学报,2015,58(9):3380-3388. |
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| 作者姓名： | 未晛 王尚旭 赵建国 唐跟阳 邓继新 |
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| 作者单位： | 1. 中国石油大学(北京)CNPC物探重点实验室, 北京 102249;2. 中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249;3. 成都理工大学地球物理学院, 成都 610059 |
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| 基金项目： | 国家重点基础研究发展计划项目(2013CB228600),国家自然科学基金(41274138,41574103,41374135),中国石油大学(北京)科研基金(ZX20150095,YJRC-2013-33,KYJJ2012-05-02)资助. |
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| 摘 要： | 为了研究孔隙流体对不同渗透率岩石地震波速度的影响,在实验室利用跨频带岩石弹性参数测试系统得到了应变幅值10-6的2~2000Hz频段下的地震波速度和1 MHz频率下的超声波速度,利用差分共振声谱法得到了频率600Hz岩石干燥和完全饱水情况下岩石声学参数.实验表明,在低饱和度下,致密砂岩在地震和超声频段下没有明显的频散;在高饱和度下纵波速度的频散变得明显.从干燥到完全水饱和条件,不同频率测量的致密砂岩的体积模量随岩石孔隙度增高而降低,且体积模量的变化量受岩石微观孔隙结构的影响较大.高孔、高渗砂岩无论在低含水度下还是在高含水饱和度下频散微弱,并且在地震频段下围压对于岩石纵横波速度的影响要大于频率的影响.高孔、高渗砂岩和致密砂岩不同含水饱和度下的频散差异可应用于储层预测,油气检测等方面,同时该研究可以更好地帮助理解岩石的黏弹性行为,促进岩石物理频散理论的发展,提高地震解释的精度.
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| 关 键 词： | 含水饱和度 致密砂岩 高孔高渗砂岩 频散 |
| 收稿时间： | 2015-04-02 |
Laboratory study of velocity dispersion of the seismic wave in fluid-saturated sandstones |
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| WEI Xian,WANG Shang-Xu,ZHAO Jian-Guo,TANG Gen-Yang,DENG Ji-Xin.Laboratory study of velocity dispersion of the seismic wave in fluid-saturated sandstones[J].Chinese Journal of Geophysics,2015,58(9):3380-3388. |
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| Authors: | WEI Xian WANG Shang-Xu ZHAO Jian-Guo TANG Gen-Yang DENG Ji-Xin |
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| Institution: | 1. CNPC Key Lab of Geophysical Exploration, China University of Petroleum (Beijing), Beijing 102249, China;2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;3. Institute of Geophysics, Chengdu University of Technology, Chengdu 610059, China |
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| Abstract: | To study the influence of pore fluid on the seismic wave velocity in sandstones with different permeability, we obtain a seismic wave velocities at seismic frequencies with strain amplitudes <10-6 and at ultrasound (~1 MHz) frequencies with a multi-frequency band elastic parameter measurement system; meanwhile, we get the acoustic properties of dry and fully water saturated sandstones using the differential acoustic resonance spectroscopy. Results show that no obvious dispersion in tight gas sandstone is observed at seismic and ultrasound frequencies at low saturations; whereas compressional velocity dispersion becomes apparent at high saturations. From dry to fully water saturation, the bulk modulus of the tight sandstones measured with different frequency decrease with higher porosity of the samples, the bulk modulus increment are greatly influenced by microscopic pore structure. No obvious dispersion in sandstone with high porosity and permeability both at low and high water saturation, and the influence of confining pressure on the compressional and shear wave velocity is greater than the frequency at seismic frequency band. The difference of the velocity dispersion of the sandstones with high porosity and permeability and tight gas sandstones can be used in the Technique for reservoir prediction and direct oil-gas detection, meanwhile, this study can help to better understand the viscoelastic behavior of rocks, promote the development of frequency dispersion theory, and improve the accuracy of seismic interpretation. |
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| Keywords: | Water saturation Tight sandstone High porosity and permeability sandstone Dispersion |
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