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通过引入岩石骨架参数表达式到Gassmann近似流体方程中,实现了基于该方程的地震孔隙度反演。但是岩石骨架参数表达式有很多种,使得地震孔隙度反演公式也各不相同,实际应用不方便,反演结果也难以评价。作者在研究现有常用岩石骨架参数表达式如Esheby-Walsh,Pride,Geertsma,Nur,Keys-Xu以及Krief等的基础上,提出了含有调节参数的岩石骨架模型统一表示式,发展了基于Gassmann方程的地震孔隙度反演方法。该方法应用范围宽,参数调节方便、灵活。为验证所提公式和方法的实用性,作者们结合ZJ地区钻井岩心的岩石物理样品测试数据和测井数据,进行了地震孔隙度反演。由于该地区油气储层的存在与中等程度孔隙度的分布有关,因此地震孔隙度反演对预测和识别油气层、干层和含水层有重要作用。反演结果与工区内孔隙度测井曲线吻合度高,说明本文所提公式与方法是有效的,可靠的。
The seismic porosity inversion based on this equation is achieved by introducing the rock skeleton parameter expression into the Gassmann approximation fluid equation. However, there are many expressions for the parameters of rock skeleton, which make the formula of seismic porosity inversion different, which is inconvenient in practical application and difficult to evaluate the inversion results. Based on the study of existing rock skeleton parameters such as Esheby-Walsh, Pride, Geertsma, Nur, Keys-Xu and Krief, the authors put forward a unified expression of rock skeleton model with tuning parameters, Seismic porosity inversion method. The method has a wide range of applications, convenient parameter adjustment and flexibility. In order to verify the practicability of the proposed formulas and methods, the authors performed seismic porosity inversion based on the rock physics test data and well logging data of drilling cores in ZJ area. Since the existence of oil and gas reservoirs in this area is related to the distribution of moderate porosity, seismic porosity inversion plays an important role in the prediction and identification of oil and gas layers, dry layers and aquifers. The inversion result is in good agreement with the porosity log in the work area, which shows that the formulas and methods presented in this paper are effective and reliable.