摘要
利用弹性模量计算地层含气饱和度丰富了利用测井资料对储集层进行解释、评价的手段,提高了含气饱和度这一重要参数的解释精度。由阵列声波测井资料得到的纵、横波速度信息以及密度信息可以计算出岩石弹性模量参数。根据Gassmann方程所描述的低频情况下岩石颗粒、岩石骨架和流体体积模量与不同孔隙组分饱和度之间的关系,建立了含气饱和度与地层饱含气、饱含水时岩石骨架体积模量与剪切模量的关系方程,从而得到基于弹性模量的地层含气饱和度计算模型。实际测井资料解释处理结果与试油资料符合,验证了方法的可行性。
The determination of gas saturation based on elastic modulus of formation enriches the methods of interpreting and evaluating reservoir,improves the interpretation accuracy of gas saturation which is a very important parameter. The elastic modulus can be determined by the velocities of compression and shear waves obtained from array sonic logging as well as the information of density. According to Gassmann equation which describes the relationship between the bulk modulus and shear modulus in a low frequency situation,an equation is established between the gas saturation and bulk modulus as well as shear modulus in cases of rock matrix,gas saturated and water saturated separately,thus gas saturation can be calculated. The processing software based on the model is developed. The examples of Sichuan central field show that the methods are sufficiently accurate and reliable.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第4期69-72,190-191,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
