冀中束鹿西斜坡潜山油水界面判识技术

Identification technique of oil-water interface of buried hill in the west slope of Shulu Sag,Jizhong

束鹿西斜坡受构造运动及沉积影响,潜山带以残丘潜山为主,油藏具有低气油比、高甲烷、油质重的特点,地层水为低矿化度NaHCO3型水,运用常规油水界面识别方法已经不能满足生产需求。通过将录井含水与含油敏感参数进行优势组合创新引入“含水指数”判识油水界面的方法,同时应用离子色谱分析技术,以敏感参数Na+的增长率和总矿化度(Kh)的增长率为横纵坐标,建立解释评价标准和图板,实现了束鹿西斜坡潜山油水界面快速识别,并在现场应用中取得良好效果,为该地区后续油气资源评价及试油工作提供有力保证。

Affected by tectonic movement and sedimentation,the buried hill zone is dominated by monadnock buried hill in the west slope of Shulu Sag,the reservoir has characteristics of low gas-oil ratio,high methane and heavy oil quality,and the formation water is low-mineralization NaHCO3.Conventional oil-water interface identification methods can no longer meet production needs.By the superiority combination of water cut and oil bearing sensitive parameters in mud logging,oil-water interface identification method of"water cut index"was innovatively introduced.Meanwhile,ion chromatography was applied and the growth rate of sensitive parameter Na+and total mineralization(Kh)were taken as abscissa and ordinate to establish interpretation and evaluation criteria and chart,realizing the rapid identification of oil-water interface of buried hills in the west slope of Shulu Sag.With good results in field application,it provided a strong guarantee for following evaluation of oil and gas reservoirs and oil test in the region.