高孔低渗碳酸盐岩储层渗透率方向性及影响因素分析

对于同一件样品而言,其水平渗透率与垂向渗透率之比,反映了样品所在储层空间渗流能力的差异,而这种差异正是该样品点上渗透能力在不同方向上变化的反映。通过分析D油田X1,X2,X3区取心测试资料,统计分析各区目的层垂向及水平方向渗透率的相对大小及其关系。根据对研究区沉积环境、颗粒相、水溶蚀模式及区内裂缝发育特征分析,分析了造成该区碳酸盐岩储层高孔低渗的原因,以及造成目的层垂向及水平方向渗透率差异的主要地质因素。该研究结果为该油田开发数值模拟及布井等提供地质依据。

Analysis of permeability orientation and its affecting factors of carbonate reservoir with high porosity and low permeability

For one same cores sample,the ratio between horizontal and vertical permeability reflects different infiltration ability of the reservoir where the coring samples were sampled.This difference is just a reflection of sample with various infiltration in different directions.By analyzing coring test data of X1,X2 and X3 zones of D Oilfield,it was summed up the relative size and relation of horizontal permeability and vertical permeability of different zones.Based on analysis of depositional environment,grain facies,water erosion model,and fracture characteristics in the interested region,it was explained and analyzed to the high-porosity and low-permeability of the carbonate reservoir,and main geological factors,which caused the difference between horizontal and vertical permeability of the formation.The study results can provide geological evidence for numerical simulation of oilfield development and well patterns.