波阻抗反演方法在塔河碳酸盐岩储层预测中的应用

Application of Wave Impedance Inversion Methods in the Carbonate Reservoir Prediction in Tahe Oilfield

详细分析了约束稀疏脉冲反演、地震特征反演以及随机反演3种反演算法及其特点,针对塔河油田碳酸盐岩储层进行了反演试算对比。研究结果表明,约束稀疏脉冲反演结果与地震反射资料特征有较好的对应关系,但其反演结果分辨率不高。随机反演能客观地描述碳酸盐岩缝洞型储层非均质性极强的分布特征,克服了其他反演结果存在连续性、成层性的缺陷,但该方法难以求取准确的变差函数。3种反演结果中,地震特征反演结果与井史储层发育段的吻合率最高,说明地震特征反演在塔河奥陶系碳酸盐岩储层预测中仍然是一种较好的方法。

This paper discusses the constrained sparse spike inversion, seismic characteristic inversion and stochastic inversion methods, analyzes the algorithm and the characteristics of the three methods in detail and applies the three methods in the carbonate reservoir in Tahe Oilfield. The results indicate that the constrained sparse spike inversion method keeps the amplitude, phase and frequency feature, producing the result in accordance with seismic reflection wave, but showing poor resolution. Stochastic inversion can objectively describe the heterogeneity reservoir of carbonate fractured-vuggy reservoirs, which overcomes the faults of continuity and stratification in constrained sparse spike inversion and seismic characteristic inversion methods. However, stochastic inversion method is difficult to obtain accurate variogram. The comparison of the three inversion method results reveals that seismic characteristic inversion method matches the reservoir better than the other two methods, thus it is an optimal method in carbonate reservoir prediction in Tahe Oilfield.