【摘要】 横波时差也反映地层孔隙度的变化,因此利用横波时差来计算地层的孔隙度是可行的。利用横波计算地层孔隙度具有计算结果受孔隙流体影响小的优点,特别是在地层含气的情况下,优势更加明显。利用横波时差计算剪切模量,同时引入临界孔隙度的概念,建立了利用横波时差计算孔隙度的方法,并给出了其中所有参数的计算方法。最后通过实际的应用,验证了所研究方法的正确性和有效性。更多还原

【Abstract】 Shear moveout reflected the porosity variation,it was feasible to compute porosity by using shear moveout.Porosity determined from shear moveout had the advantage of less influence on computation result by pore fluid,especially the advantage was obvious when gas was saturated in formation.Shear modulus can be obtained from shear moveout.The method of computing porosity from shear moveout is established based on critical porosity.And the computing methods of the relative parameters are also introduced.Correctness and effectiveness of the method are proven in field application.更多还原