基于三维定量荧光技术的西湖凹陷储层复杂流体性质快速识别方法

A RAPID IDENTIFICATION METHOD OF COMPLICATED FLUID PROPERTIES BASED ON 3D QUANTITATIVE FLUORESCENCE LOGGING TECHNOLOGY IN THE XIHU SAG

西湖凹陷是中国近海最大的含油气凹陷,储层流体性质复杂,快速识别困难。基于大量三维定量荧光图谱特征及关键参数分析研究,发现激发波长、发射波长、荧光对比级、油性指数等关键参数的交会特征与储层流体性质具有明显的相关性。利用15口探井实测数据,结合测井、测试结果,建立了西湖凹陷不同区块储层流体性质解释图和综合解释表,即三维定量荧光关键参数交会解释法。该方法资料录取简便快捷,可以快速识别如高阻水层、低阻气层等疑难储层流体性质,且不受储层物性的影响,评价结果与测井、测试结果一致,在勘探评价过程中应用效果良好,具有推广价值。

The Xihu Sag is the largest offshore oil-gas basin in China,with complicated reservoir fluid properties which are difficult to identify quickly.Based on a large number of three-dimensional quantitative fluorescence spectrum data,through carrying out the analysis of key parameters,it is found that the intersection characteristics of key parameters,such as the excitation wavelength,emission wavelength,fluorescence contrast level,oil index and so on,have obvious correlation with the reservoir fluid properties.Hence,based on the measured data of 15 exploration wells,combined with the logging and testing results,interpretation charts and standards of reservoir fluid properties in the different zones of the Xihu Sag are established,that is,the intersection interpretation method of three-dimensional quantitative fluorescence key parameters.This method is simple and rapid in data acquisition,and can quickly identify the fluid properties of difficult reservoirs such as high resistivity water layer and low resistivity gas layer,and it is not affected by the physical properties of the reservoir.The evaluation results are consistent with the well logging and testing results,and it has successful application in the field,the technology is worth promoting.