摘要
对于成岩作用较强的碳酸盐岩油藏,沉积相约束下的储层建模方法已不适用。为此,提出了基于岩石类型约束的油藏地质建模方法。应用取心样品的孔隙度、渗透率和毛细管压力曲线等数据,采用Winland R35方法,划分油藏岩石类型,建立不同岩石类型下的孔隙度和渗透率关系。通过取心井建立测井曲线与岩石类型的关系,以测井曲线为纽带预测未取心井的岩石类型;并通过序贯指示模拟预测井间岩石类型,建立三维岩石类型模型。基于岩石类型和地震波阻抗数据体协同约束,建立孔隙度模型;再利用不同岩石类型下的孔-渗关系确定渗透率,建立渗透率模型。经过抽稀验证,地质模型精度较高。这种方法对于埋藏较深、成岩作用较强的碳酸盐岩油藏尤为适用。
For carbonate reservoirs which undergo significant overprint of diagenesis, sedimentary facies-constrained reser- voir modeling method is no longer applicable. This paper puts forward a rock type-constrained geological modeling method for this kind of reservoirs. By taking advantage of the available core data such as porosity, permeability and capillary pres- sure,we used Winland R35 method to identify the rock types of carbonate reservoirs, and to derive porosity-permeability relationships for different rock types. The relationships between rock types and log responses were then established for the cored wells, and were utilized to predict rock types in uncored wells. A porosity model was finally built based on the coor- dinated constraint of rock type and seismic acoustic impedance volume, and a permeability model was built by using the porosity-permeability relationships for different rock types. The reliability of geological model was checked by the method of decreasing wells. This method is particularly applicable to carbonate reservoirs with strong diagenesis and deep burial depth.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2013年第4期558-563,共6页
Oil & Gas Geology
基金
国家"十二五"科技重大专项(2011ZX05031-003)
