裂缝-孔隙型储层非均质主控因素分析——以阿姆河BP气田XVhp层为例

Analysis on Main Controlling Factors of Fracture-pore Reservoir Heterogeneity——A Case Study of XVhp Layer in BP Gas Field of Amu Darya River

阿姆河BP气田碳酸盐岩储层非均质性严重。以BP气田XVhp层为例,通过分类表征法,应用区域地质资料、岩心、薄片、测井资料及分析化验资料,开展BP气田裂缝-孔隙型储层非均质表征及主控因素分析。分类表征法可以定量描述裂缝-孔隙型储层的非均质程度,并在此基础上确定了目的层段储层非均质性的主控因素。层序内基准面旋回、层序界面及致密层的数量控制储层的发育,SQ4层序内的优质储层,比致密层相对发育的SQ5和SQ3层序中的优质储层厚度更大、储地比更高;生屑滩、砂屑滩微相为较有利的储集相带;储层的发育主要依赖于破裂、溶蚀作用等,破裂作用产生规模大、充填程度低的高角度缝、垂直缝等,溶蚀作用增强灰岩孔渗性,改善了储层质量。结合储层厚度和沉积相平面展布,XVhp层有利区分布在B21、B22、P23、BU21井区及附近。

The heterogeneity of carbonate reservoirs in BP Gas Field of Amu Darya River is significant.The classification characterization method can be applied to the study of XVhp layer in BP Gas Field.The heterogeneity of fracture-pore reservoirs in BP Gas Field is characterized and its main controlling factors are analyzed by using regional geological data,core,thin section,logging data and analysis and test data.The classification characterization method can quantitatively describe the heterogeneity of fracture-pore reservoirs,and the main controlling factors of reservoir heterogeneity in the target interval are determined based on that.The development of reservoirs is controlled by the number of base level cycles in the sequences,sequence boundaries and tight layers.The high-quality reservoirs in sequence SQ4 have thicker thickness and higher reservoir-stratum ratio than those in sequence SQ5 and SQ3 with relatively developed tight layers.The microfacies of bioclastic beach and sandy beach are the favorable reservoirs.The development of reservoirs mainly depends on the action of fracture and dissolution and so on.The action of fracture may create high angle fractures and vertical fractures with large scale and low filling degree.The dissolution enhances the porosity and permeability of limestone and improve reservoir quality.Combined with the reservoir thickness and the plane distribution of sedimentary facies,the favorable areas of XVhp layer are distributed at well blocks B21,B22,P23and BU21 and nearby.