轻质油的测录井综合识别方法

随着中东区块勘探开发程度的不断深入,诸多产油井相继发现了轻质油的存在。针对轻质油的密度小、气油比高、识别难度大的问题,通过分析对应的测井响应特征,寻找对油质敏感的测井曲线,并计算了可以反映流体挥发性的挥发指数;同时,将气测录井三角形图版数值化,并结合实际气测组分构成,优化烃比值计算方法,计算可以反映更多不同烃组分特征的三角形图版指数。将三角形图版指数和挥发指数相结合,建立了可以同时表征轻质油的挥发性及烃组分特征的测录井综合识别图版。结果表明:测录井综合识别图版对轻质油识别效果良好,对该地区后期的勘探开发以及油藏评价有很好的指导意义。

Comprehensive Recognition Method of Mud Logging and Well Logging Data for Light Oil

With the deepening of exploration and development in the Middle East Block, many oil wells have found the existence of light oil one after another. In view of the problems of low density, high gas-oil ratio and difficult identification of light oil, by analyzing the corresponding logging response characteristics, finding logging cyres sensitive to oil quality, a volatilization index reflecting the volatility of fluids was calculated; at the same time, the triangular chart of gas logging is digitized, and the calculation method of hydrocarbon ratio is optimized in combination with the composition of actual gas logging components, calculating triangular plate indices that can reflect more characteristics of different hydrocarbon components. Combining triangle plate index with volatilization index, a comprehensive logging recognition chart which can simultaneously characterize the volatility of light oil and the characteristics of hydrocarbon components is established. This chart has good recognition effect for light oil, and has a good guiding significance for later exploration and development and reservoir evaluation in this area.