摘要:
在双相介质理论指导下构建的流体因子Gassmann流体项<i<f</i<可以实现对油水层的有效判识。本文基于包含流体因子<i<f</i<的反射系数近似公式推导,得到相应的流体弹性阻抗方程,将流体因子纳入地震反演过程并直接参与目标储层的流体识别,实现了从弹性阻抗数据体中直接反演流体因子<i<<i<f</i<</i<的方法技术流程。流体因子<i<f</i<的直接反演有效减少间接计算所带来的累计误差,提高了地震流体识别的精度。在实际资料应用中,结合研究区地质背景与地球物理特征开展的岩石物理分析表明,Gassmann流体因子<i<f</i<对含油和含水特征有较好的区分作用。反演结果表明,流体因子<i<f</i<能为有效地识别目的层的油水特征,为下一步的钻井开发提供可靠的技术支持。
Abstract:
Based on the theory of two-phase media, construct Gassmann fluid factor, which can be achieved on effective oil/water discrimination. Further the corresponding fluid elastic impedance equation is derived from a fluid item involved reflection coefficient approximation formula, take fluid factor into seismic inversion process and directly involved in the process to identify the target reservoir fluid, then achieve a direct inversion fluid factor method, technology and processes from elastic impedance data volume. Direct inversion of fluid factor reduces the error caused by calculating the fluid factor indirectly, which improves the accuracy of seismic fluid identification. In the real data application, the petrophysical analysis showed Gassmann fluid factor is helpful for distinguishing oil and water. The inversion results show that the fluid factor is able to effectively identify target layer of oil and water features, provides a reliable technical support for the next drilling development.
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