Seismic low-frequency effects in monitoring fluid-saturated reservoirs
Seismic low-frequency effects in monitoring fluid-saturated reservoirs
复制标题
DOI：
10.1190/1.1707072
复制
发表时间：
2004-04
期刊：
影响因子：
3.3
通讯作者：
V. Korneev;G. Goloshubin;Thomas M. Daley;Dmitry B. Silin
中科院分区：
文献类型：
--
作者：
V. Korneev;G. Goloshubin;Thomas M. Daley;Dmitry B. Silin
地震属性之间存在着复杂的关系，包括反射的频率依赖性和储层中的流体饱和度。实验室和野外观测数据表明，与气体饱和层的反射相比，流体饱和层的反射在低频下具有更大的幅度和延迟的旅行时。实验室模拟结果与扩散粘性理论模型的比较表明，品质因子Q的低(<；5)值可以解释观测到的频率相关性。在现场尺度上，对时移VSP数据的常规处理发现，当储气藏流体从气变成水时，储气藏的地震响应变化很小。低频分析发现，地震反射属性在15-50赫兹范围内有显著变化。现场观测结果与实验室数据和扩散-粘性理论预测的结果一致。一种解释是，Q值非常低是流体流动引起的内部扩散损失的结果。这一解释还需要进一步的理论研究。本文提出的频变幅度和相位反射特性可用于探测和监测含流体饱和层。
There is a complex relationship between seismic attributes, including the frequency dependence of reflections and fluid saturation in a reservoir. Observations in both laboratory and field data indicate that reflections from a fluid-saturated layer have an increased amplitude and delayed traveltime at low frequencies, when compared with reflections from a gas-saturated layer. Comparison of laboratory-modeling results with a diffusive-viscous-theory model show that low (<5) values of the quality factor Q can explain the observations of frequency dependence. At the field scale, conventional processing of time-lapse VSP data found minimal changes in seismic response of a gas-storage reservoir when the reservoir fluid changed from gas to water. Lowfrequency analysis found significant seismic-reflectionattribute variation in the range of 15‐50 Hz. The field observations agree with effects seen in laboratory data and predicted by the diffusive-viscous theory. One explanation is that very low values of Q are the result of internal diffusive losses caused by fluid flow. This explanation needs further theoretical investigation. The frequencydependent amplitude and phase-reflection properties presented in this paper can be used for detecting and monitoring fluid-saturated layers.