基于虚拟井约束的致密砂岩储层建模方法

Modeling method of tight sandstone reservoir constrained by virtual well

储层精细地质建模是油气田开发的基础和重点,其意义在于直观地描述一个油气藏的构造特征、储层分布及其非均质性特征等。致密砂岩气藏具有岩性致密、低孔低渗,储层非均质性强的特点。在井网稀疏、分布不均匀的地区,常规的相控和地震约束的建模方法难以准确刻画致密储层的空间分布特征。针对这一问题,本文以鄂尔多斯盆地H气田下石盒子组盒1段储层为例,提出了一种利用构建虚拟井的方法,提高测井解释、地震预测和地质认识在模拟过程中的约束作用,达到精细刻画储层非均质性的目的。结果表明,该方法使建模结果精度更高,更加符合地质实际,为后期数值模拟和井位部署提供了可靠的地质依据。

Fine geological modeling is the basis and key of oil and gas field development.Its significance lies in intuitively describing the structural characteristics,reservoir distribution and heterogeneity of oil and gas reservoirs.Tight gas reservoir has the characteristics of low porosity,low permeability and strong heterogeneity.It is difficult to accurately describe the distribution characteristics of tight reservoirs by conventional modeling methods of facies control and seismic constraints in areas where wells are sparsely and unevenly distributed.To solve this problem,taking H gas field in Ordos basin as study object,an inserting virtual well method is proposed to improve the constraints of logging interpretation,seismic prediction and geological knowledge in the simulation process,which can characterize heterogeneity of reservoir in detail.The results show that after inserting virtual wells,the simulation results are more accurate and more in line with geological reality,which can provide more reliable geological basis for numerical simulation and well deployment.