塔河油田石炭系低阻油层测井解释及评价

Logging evaluation of low resistivity reservoir in carboniferous, Tahe Oilfield

塔河石炭系油藏为披覆于奥陶系顶面古地貌隆起上的低幅度构造圈闭和岩性圈闭所控制,储层电性高低除了受物性和含液性影响之外,还明显受岩性变化的影响。低阻油层最大的特点是与邻近水层电阻率值接近,难于识别。本文在岩心分析、薄片观察、地层水分析及压汞资料的基础上分析了塔河2区石炭系油层低阻成因。研究发现高地层水矿化度及高束缚水饱和度是造成其油层低阻的主要原因。结合本区实际情况,建立适合该区的测井参数解释模型。根据测井参数解释结果、测试及录井资料,利用交汇图法,建立了油水层识别的标准,应用于实际,取得了较好的效果。

Tahe 2 carboniferous reservoir is controlled by structural trap and lithologic trap with low amplitude which cover on the Ordovician paleogeomorphology uplift. The value of reservoir electrical property is obviously controlled by the impact of lithological change in addition to physical property and fluid property. The main characteristic of low resistivity reservoir is close to the resistivity value of adjacent water layer, being difficult to identify. The genesis of oil reservoir is analyzed in carboniferous of Tahe 2 Oilfield based on the data analysis of core, formation water and slice observation. The study found that high reservoir water salinity, thin interbedded mudstone, clay mineral adsorption conductivity and reservoir lithologic trap with low amplitude cause the low resistance reservoir and high salinity formation water is the main reason. Combined with the actual situation, we established suitable logging parameters interpretation models in the region. According to logging parameter interpretation results, testing and logging data, we established a new oil and water layer identification standard using the intersection graph method,which was applied in practical, and obtained good results.