文昌13-1油田海相非均质地层流动单元识别方法

Flow-unit Recognition Method of Heterogeneous Marine Strata in Wenchang 13-1 Oilfield

随着开发的深入,文昌13-1油田珠江组(N1zj)海相碎屑岩储层的非均质性及其引起的渗流特征差异对开发的影响日益显著,开展流动单元表征成为指导油藏高效开发的迫切需要。根据目的层上下两个单元储层地质特征差异大的特点和分层系开发的要求,建立了研究区级次化的流动单元识别方法。首先根据N1zj持续海进沉积形成的垂向岩性、粒度及宏观物性变化规律,综合沉积相、岩性和宏观物性特征进行第一级次流动单元识别;然后从取心井出发,建立次一级流动单元的流动分层指标FZI(Ifz),判别标准,在非取心井段建立基于常规测井参数的次级流动单元贝叶斯判别函数,实现了全井段的流动单元识别,该方法可以推广到沉积演化和储层地质特征相近的整个文昌油田群。

With the deepening of oil and gas development,influence of reservoir heterogeneity and flow character difference on oil development was becoming obvious in marine clastic reservoirs of Zhujiang Formation in Wenchang 13-1 Oilfield.Flow unit study was needed for high efficiency reservoir development.A hierarchic method for flow unit recognition was built according the characteristics of big differences between the upper and lower reservoir units and requirement of hierarchic reservoir development.Based on rules of changes of vertical lithology,particle size of continuous transgression happened during deposition of Zhujiang Formation,these changes were comprehensively used for the time for flow unit recognition,and based on the coring wells,FZI discrimination criterion was established for the second order flow unit recognition.In the wells without drilling cores,Bayes function for suborder flow unit recognition is created based on well logging data.Flow unit recognition of the whole wells is realized.The method can be used in the whole Wenchang Oilfield Group with similar deposition evolution and reservoir geologic characters.