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致密储层在油气勘探开发中越来越受到人们的重视.致密储层具有低孔低渗的特征,我们在分析致密储层孔隙特征的基础上考虑了基质固体颗粒的影响.在不知道基质颗粒几何细节的情况下,HS界限和VR界限只能给出基质模量的近似取值范围.为了更加精确计算岩石弹性模量和速度,需要考虑固体颗粒几何形状的影响.基于自相容近似,我们给出了一个新的模型S-S模型,该模型同时考虑了孔隙形状和固体颗粒形状对岩石纵横波速度的影响.通过实例应用,发现考虑固体颗粒形状的影响可以提高横波速度预测精度,验证了新模型的适用性.
Tight reservoirs have drawn more and more attention in the exploration and development of oil and gas.Compacts in the tight reservoirs have the characteristics of low porosity and low permeability and we consider the influence of matrix solid particles on the basis of analyzing the pore characteristics of tight reservoirs.When we do not know the matrix particles In the case of geometrical details, the HS and VR bounds can only give an approximate range of matrix modulus.In order to calculate rock elastic modulus and velocity more accurately, the influence of solid particle geometry needs to be considered.According to self-compatible approximation, We give a new model SS model which considers the effect of pore shape and solid particle shape on the P- and S-wave velocities of the rock.According to the practical application, it is found that considering the effect of the solid particle shape can improve the S-wave velocity prediction accuracy, Applicability of the new model.