基于地震等时格架的倾角导向储层静态建模方法

摘要

When dividing vertical layer is not isochronal and the oil field has sparse well pattern,the accuracy of reservoir parameter prediction in reservoir static modeling will be reduced.Especially in the offshore oil field with a little drilling,it is difficult to establish the reservoir parameter model with high accuracy based on geological statistics method.In order to establish a better isochronous stratigraphic framework and improve the accuracy of reservoir parameter prediction,the method of dip steering reservoir static modeling based on seismic isochronal stratigraphic framework is studied.For the method we establish three-dimensional strata model by dividing vertical layers under the steering of seismic dip cubes,predict reservoir spatial variation from sensitive seismic attributes and combine with well data to establish three dimensional model of reservoir parameters.Comparing with conventional structural modeling methods,stratigraphic framework model under the steering of seismic dip cubes is established in the method.At the same time,the transfer function calculated from seismic attributes to establish reservoir parameter model,which is different from geological statistics method that takes variation function to build reservoir model.And the method can improve the accuracy of reservoir model when the oil field has sparse well pattern.The practical application of an offshore oil field with sparse well pattern shows the method establishes a more isochronous stratigraphic framework than conventional modeling method and further improves the accuracy of the geological modeling.%为了建立等时性更好的地层格架,提高井网稀疏时储层参数的预测精度,提出了基于地震等时格架的倾角导向储层静态建模方法.以地震倾角体为导向划分垂向网格层并建立三维地层网格模型,利用敏感地震属性计算储层参数的空间变化规律,再结合井筒信息预测储层参数值,建立三维储层参数模型.与传统构造建模方法相比,该方法的优点是采用了倾角导向来建立等时地层格架模型.该方法基于地震属性求取的转换函数来建立储层参数模型,有别于传统地质统计学采取变差函数建模的方法,克服了井网稀疏条件下建模精度低的缺陷.模型测试与海上油田的实际应用表明,与传统地质统计学方法相比,该方法建立了更等时的三维地层网格模型,提高了井网稀疏时储层参数建模的精度.