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川西Q地区须家河组储层作为川西坳陷中深层重要气层系之一为典型的致密碎屑岩储层,具有多层系、多类型、多组合的储集体系特点。该区致密碎屑岩钙质含量高,非均质性强,对地层电阻率影响大,储层物性具有低孔低渗高含水饱和度特点,测井解释孔隙度、渗透率参数误差大,气水纵向上间互分布、横向上邻井对比性差导致气水层识别不准确等问题。本文根据不同流体在测井响应上的差别,采用综合指数法(FTI)、电阻率与孔隙度交会图法、正态概率分布法(P1/2)进行流体识别,得到各方法的符合率分别为86.36%、68.19%和90.91%。综合各因素分析,综合指数法(FTI)和正态概率分布法(P1/2)能达到该区准确流体识别的要求,为川西地区须家河组储层的流体识别方法适用性提供了依据。
The Xujiahe Formation reservoir in the Q area of western Sichuan is one of the most important gas-bearing reservoirs in the middle-deep layers of the western Sichuan depression. The typical tight clastic reservoir is characterized by multi-layered, multi-type and multi-combination reservoir systems. The densified clastic rocks in this area have high content of calcium, strong heterogeneity, great influence on the resistivity of the formation and low porosity, low permeability and high water saturation of reservoir physical properties. Logging interpretation of the parameters of porosity and permeability is large, Gas and water vertical distribution between each other, laterally adjacent well poor contrast gas and water layer recognition is not accurate and so on. In this paper, fluid identification was made based on the difference of well logging response of different fluids by FTI, resistivity and porosity cross plot, and normal probability distribution (P1 / 2) 86.36%, 68.19% and 90.91% respectively. According to the analysis of various factors, FTI and P1 / 2, the requirement of accurate fluid identification in this area can be achieved, which provides a basis for the applicability of the fluid identification method in the Xujiahe Formation reservoir in western Sichuan .