基于岩石类型约束的碳酸盐岩油藏地质建模方法——以扎格罗斯盆地碳酸盐岩油藏A为例

doi:10.11743/ogg20130419

摘要/Abstract

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。

关键词: 地震波阻抗, 岩石类型, KNN算法, Winland R₃₅方法, 碳酸盐岩, 地质建模

Abstract: For carbonate reservoirs which undergo significant overprint of diagenesis,sedimentary facies-constrained reservoir modeling method is no longer applicable.This paper puts forward a rock type-constrained geological modeling method for this kind of reservoirs.By taking advantage of the available core data such as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 pressure,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 coordinated 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.

Key words: seismic acoustic impedance, rock type, KNN algorithm, Winland R₃₅ method, carbonate rock, geological modeling

中图分类号:

TE122.2

谭学群,廉培庆,邱茂君,等. 基于岩石类型约束的碳酸盐岩油藏地质建模方法——以扎格罗斯盆地碳酸盐岩油藏A为例[J]. 石油与天然气地质, 2013, 34(4): 558-563. doi: 10.11743/ogg20130419 Tan Xuequn,Lian Peiqing,Qiu Maojun,et al. Rock type-constrained geological modeling of carbonate reservoirs：a case study of carbonate reservoir A in the Zagros Basin[J]. Oil & Gas Geology, 2013, 34(4): 558-563. doi: 10.11743/ogg20130419

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