裂缝各向异性油藏孔隙度和渗透率计算方法

裂缝性油藏介质由基质和有效裂缝组成。利用岩心分析、测井、地震、薄片分析等静态描述手段测试并计算了基质的孔隙度和渗透率，得到裂缝的宽度、密度和方位等参数。以油藏流体流动模型为基础，利用生产、试井、试采或试油数据求出油藏总渗透率，再结合裂缝参数确定裂缝系统的各向异性渗透率。采用随机裂缝模型，由裂缝渗透率和裂缝宽度计算得到裂缝孔隙度。该方法给出了裂缝和基质系统的渗透率与孔隙度间的定量关系，确定的参数分布合理而完善；考虑了油田各种基础资料数据采集的成本和可行性，具有经济、高效、实用的特点。该方法的应用较好地解决了辽河油田小22块火山岩裂缝性油藏预测模型难以建立的问题。

Calculation method of porosity and permeability in fractured anisotropic oil reservoirs

Fractured reservoirs media consist of matrix and effective fractures. The porosity and permeability of matrix, and the width, density and direction parameters of fractures were obtained by core analysis, well logging, seism and thin section observation methods, On the basis of reservoir fluid flow model, the assembled permeability of the formation was determined by well production, well testing, production test or formation testing data, By integrating formation permeability and fracture parameters above, the anisotropic permeability was calculated, Utilizing the stochastic fracture model, porosity of fracture system was determined from fracture width and permeability, Quantitative correlations among the permeability and porosity of fracture and matrix systems were provided, The permeability and porosity distributions given are valid and comprehensive, The cost and feasibility of collection of the basic data from fidd were considered, so the methodology is economical, practical and highly effective. By the application of the method in a volcanic reservoir of Xiao 22 in Liaohe Oilfield, the problems in reservoir modeling were resolved.