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以地震资料为主体的储层流体识别技术对现阶段油气勘探具有重要意义。本文利用岩石模量参数与品质因子作为储层流体指示因子,从提高流体指示因子估算可靠性的角度出发,分别研究了基于弹性阻抗反演的弹性模量参数直接估算方法与基于小波域QVO的品质因子估算方法。岩石模量参数直接估算方法在充分利用弹性阻抗反演高抗噪性与实用性的同时,有效地避免了间接累计误差的影响。品质因子的估算方法基于零相位子波假设,通过对小波域叠前品质因子的归零处理消除叠加平均效应。通过模型试算验证两种方法的流体判识可行性;并且结合实际资料进一步表明岩石模量与品质因子信息的综合应用可以提高储层流体的检测质量。
Reservoir fluid identification technology based on seismic data is of great significance to oil and gas exploration in the current stage. In this paper, we use rock modulus parameters and quality factor as indicator of reservoir fluid, and from the perspective of improving fluid indicator to estimate reliability, we study the methods of direct estimation of elastic modulus based on elastic impedance inversion and QVO based on wavelet domain Quality factor estimation method. The method of direct estimation of rock modulus parameters can effectively avoid the influence of indirect total error while making full use of the high noise immunity and practicability of elastic impedance inversion. Based on zero-phase wavelet assumption, the quality factor estimation method eliminates the additive effect by zeroing the pre-stack quality factor in the wavelet domain. The feasibility of the fluid identification of the two methods is validated through the model test calculation. Combined with the actual data, it is further indicated that the comprehensive application of rock modulus and quality factor information can improve the detection quality of reservoir fluid.