基于储层精细描述的水平井优化设计方法

目的分析苏里格气田上古生界盒8段辫状河道砂体的发育特点,完善该类储层水平井设计方法。方法在现代辫状河沉积考察的基础上,通过岩心、岩屑观察,以及密井网区测井曲线形态的分析与对比,剖析储层的内部结构及发育规模。结果辫状河道主要由心滩、河道充填、废弃河道及落淤层等4个微相构成。心滩微相粒度粗、物性好,河道充填微相粒度细,废弃河道及落淤层以泥岩沉积为主。结论心滩为辫状河道内有利的沉积微相,水平井设计中应考虑其规模与走向。

Horizontal well design based on the detailed description of reservoir

Aim To analyze the development characteristics of braided channel within H8 member in Sulige gasfield,improve the design methods of horizontal wells.Methods Based on the survey of the modern sedimentation in braided channel,through observing core and rock debris as well as the formation analysis and comparison of logging curves in crowd-well area,the inner structure of the reservoir and its development scope are analyzed.Results Braided channel mainly consists of channel bar,channel sediments,abandoned channel and fall-silt seam.The microfacies of channel bar is coarse-grained sandstones,the microfacies of channel sediments is fine-grained sandstones and the abandoned channel and fall-silt seam are mainly mudstone.Conclusion Channel bar is the favorable microfacies,its scope and trends should be taken into consideration when designing a horizontal well.