多点地质统计学在致密砂岩气藏储层建模中的应用——以s48-17-64区块为例

Application of multiple-point geostatistics method in reservoir modeling of tight sandstone gas reservoir:Taking Block s48-17-64 as an example

苏里格气田致密砂岩气藏非均质性强,沉积微相规律性差,地质建模难度大。参考其他随机性地质建模方法,优选多点地质统计学地质建模,综合基于目标和基于象元的优势,提出了"井-震-地质统计学规律"的综合一体化随机性地质建模思路。在苏里格气田西区s48-17-64区块,基于前期地质认识和密井网砂体解剖,以盒8下辫状河沉积微相模式作为多点地质统计学的训练图像,三维地震资料为软约束体,离散化测井数据为硬数据体,井震结合建立三维地质模型,并采用不断完钻的气井验证地质模型,二次建模。经过验证,该方法建立的地质模型精度高,降低了随机建模离散化问题,在开发实践中发挥了积极作用,展示了良好的应用前景。

Sulige Gas Field is tight sandstone gas field which has the characteristics of strong heterogeneity,poor regularity of sedimentary facies and difficulty of geological modeling.Compared with other geological modeling methods,multiple-point geostatistics method is selected to build geological model.Integrated the advantage based on target and pixel,this paper put forward the stochastic geological modeling thought of ＂well-seismic-geostatistics ＂.Using this method and based on geological pre-knowledge and sandbody research of dense well pattern,this paper established Lower He 8 facies model in Block s48-17-64 as drawing train image,and used 3D seismic as soft constrain and well log as hard data to build 3D model by adopting the geological model of drilled gas well.Verifying shows that the accuracy of geological model built by this method is high.It can decline the discretion of random method and can play a positive role in gas field development,showing a fantastic application prospect.