【摘要】 西湖凹陷平北区储层物性、流体变化所指示的地震响应规律复杂,常规AVO技术难以识别。本文论述了扩展弹性波阻抗反演的基本原理,给出了利用扩展弹性波阻抗反演进行岩性或流体检测的具体流程,并指出其关键是最优流体角的求取,从而按角度把波阻抗和梯度阻抗进行结合来预测岩性和流体。扩展弹性阻抗反演充分利用了地质体的弹性信息和叠前道集振幅随偏移距变化的响应特征,是一种深化了截距、梯度属性分析的应用,对岩性和流体的预测能力较强。平北区实际应用表明,该方法可以突出流体异常,在剖面上进行的流体预测与井吻合较好,平面上的油气展布符合地质认识,D井的实钻结果验证了基于EEI反演的流体检测技术在平北区构造-岩性油气藏勘探开发研究中的适用性。更多还原

【Abstract】 The seismic response of reservoir properties and fluid changes in the Pingbei area of the Xihu sag are complex, and it is difficult to identify by conventional AVO techniques. This paper introduces the basic principle of extended elastic wave impedance inversion, and proposes the specific process flow of lithology or fluid detection by using extended elastic wave impedance inversion. The key step is to obtain the optimal fluid angle, and then the lithology and fluid can be predicted by combining the wave impedance and gradient impedance based on the angle. The extended elastic impedance inversion makes full use of the elastic information of geological body and the response characteristics of the amplitude of pre-stack gathers along with the offset, which deepens the analysis of intercept and gradient properties and has strong predictive capacity for lithology and fluids. The practical application in Pingbei area shows that this method can highlight fluid anomalies, and the fluid prediction on the section is in good agreement with the well condition. The oil and gas distribution on the plane conforms to the geological understanding. The actual drilling results of Well D verify the applicability of EEI inversion-based fluid detection technology in the exploration and development of tectonic-lithologic reservoirs in Pingbei area.更多还原