M区块测井评价技术研究

为了精细评价南海西部海域高温高压气层,现场测井解释在储层参数研究和流体性质识别面临挑战。从岩心粒度分析成果入手,通过分析岩性、渗透性和电阻率三者之间的关联,将储层分为高阻高渗、低阻低渗和低阻特低渗三种类型。利用岩电实验、压汞实验和水分析化验结果建立了三种类型储层的测井评价参数,为定量精确求取含气饱和度提供了依据。测井流体性质识别技术包括图版识别法、电阻率反演和核磁产能评估。解释图版快速识别是现场测井解释的前提和有效手段。泥浆侵入严重时采用电阻率反演技术可以消除侵入对电阻率的影响。核磁产能预测高阻高渗储层高产,低阻低渗储层核磁产能预测为Ⅳ-Ⅴ类储层,与地层测试结果相符。储层参数研究成果是做好M区块测井解释的基础和保证,结合多种流体性质识别方法,在南海西部M气田评价了13口探井,其中4口井获高产。该套高温高压评价方法具有良好的应用前景。

Study on Logging Evaluation Technology Used on M Block

In order to fine evaluation of high temperature and high pressure gas reservoirs in the western South China Sea, logging interpretation technology used in reservoir parameter study and identification of fluid properties are facing challenges. On the basis of the analyzing results on the core particle size, the analysis on the relationship of lithology, permeability and resistivity, the reservoirs are classified as three kinds, including high resistance and high permeability, low resistance and low permeability and low resistance and extremely low permeability. Through rock electricity experiment, mercury injection experiment and water analysis laboratory re- sults, three types of reservoir logging evaluation parameters have been established, which provided a solid basis for precise quantita- tive calculation of gas saturation. Fluid property identification techniques are mainly chart recognition method, inversion of resistivity and magnetic productivity evaluation. Crossplot for rapid identification is the effective method for on site logging interpretation. By inversion technique, the influence of invasion can be eliminated. High resistance and high permeability reservoirs forecasted by NML can get high productivity, but low resistance and low permeability reservoirs productivity are only class IV-V reservoir, which are ac- corded with the production testing results. Study of reservoir parameters is the foundation and guarantee for obtaining good logging interpretation in block M. With a variety of fluid property identification method, 13 exploratory wells have been evaluated, of which high production has been obtained in 4 wells. This evaluation method for high temperature and high pressure reservoirs has good ap- plication prospects in the western South China Sea.