基于孔、裂隙理论评价致密气层

Evaluation of tight gas formation based on pore and fracture theory

致密性油气藏能够产出可观的油气,与地层中微裂隙的发育有密切关系。因此,评估致密性储层的裂隙发育程度并确定流体性质至关重要。孔、裂隙理论正演模拟显示,纵、横波速度对裂隙参数和流体性质敏感,基于此,利用此理论模型计算的纵、横波速度和实际测量的纵、横波速度构造反演目标函数,反演获取裂隙密度以及流体模量。实例应用显示,反演结果与测试效果有较好的一致性,应用效果显著。

Tight reservoirs can produce considerable oil and gas,which is closely related to the development of micro-fractures in the formation.Therefore,it is very important to evaluate the degree of fracture development in tight reservoirs and determine the fluid properties.The forward simulation of pore and fracture theory shows that the velocity of longitudinal and transverse wave is sensitive to fracture parameters and fluid properties.Based on this,the inversion objective function is constructed by using the P-and S-wave velocities calculated by the theoretical model and the measured P-and S-wave velocities,and the fracture density and fluid modulus are obtained by inversion.The application shows that the inversion results are consistent with the test results,and the application results are remarkable.