基于White模型的含气砂岩垂直入射地震响应特征分析

发布时间：2018-03-16 02:03

本文选题：斑块饱和模型　切入点：含气砂岩　出处：《石油物探》2017年02期 　论文类型：期刊论文

【摘要】：基于空间周期排列的球状斑块饱和模型(White模型)和动态体积模量理论,研究了含气饱和度和渗透率对固结良好、中等固结和未固结砂岩储层地震响应特征的影响,结果表明:1当含气饱和度增大时,地震纵波相速度的衰减会更加明显,在地震频段内可达数百m/s,而渗透率增大对其造成的影响则相对较小;2高频情况下,含气饱和度越高,逆品质因子越高,地震波衰减越强;3低频情况下,含气饱和度越高,逆品质因子越低,地震波衰减越弱。利用相移法波动方程正演对三类砂岩储层地震响应特征进行了数值模拟,结果显示:1增大含气饱和度可使储层下界面反射产生时间延迟,且在未固结和中等固结的砂岩储层中十分明显,地震波主频逐渐向低频方向移动;2在含气饱和度较高的状态下,介质中流体的流动性增强,导致渗透率对地震波速度的衰减能力增强。
[Abstract]:Based on the spherical patch saturation model (White model) and the dynamic volume modulus theory, the effects of gas saturation and permeability on seismic response characteristics of well-consolidated, medium-consolidated and unconsolidated sandstone reservoirs are studied. The results show that when the gas saturation increases, the attenuation of the velocity of the seismic longitudinal wave phase becomes more obvious, which can reach several hundred m / s in the seismic frequency band, while the effect of the increase of permeability on it is relatively small, the higher the gas saturation is, the higher the gas saturation is. The higher the inverse quality factor is, the stronger the attenuation of seismic wave is, and the higher the gas saturation is, the lower the inverse quality factor is. The seismic wave attenuation is weaker. The seismic response characteristics of three types of sandstone reservoirs are numerically simulated by the forward modeling of wave equation of phase shift method. The results show that increasing the gas saturation at 1 / 1 can delay the time of reflection at the lower interface of the reservoir. Moreover, it is very obvious in unconsolidated and medium consolidated sandstone reservoirs that the main frequency of seismic waves gradually moves to the direction of low frequency. Under the condition of high gas saturation, the fluidity of fluid in the medium is enhanced. The attenuation ability of permeability to seismic wave velocity is enhanced.
【作者单位】：油气藏地质及开发工程国家重点实验室(成都理工大学);成都理工大学地球物理学院;成都理工大学能源学院;
【基金】：国家自然科学基金石油化工联合基金(U1562111) 中国石油化工股份有限公司地球物理重点实验室开放研究基金(33550006-15-FW2099-0029)共同资助~~
【分类号】：P631.4

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