气测曲线峰型形态定量化评价方法及其应用实例

Quantitative evaluation method of peak configuration of gas logging curve and application example

气测曲线峰型形态特征可以反映储集层流体在纵向上的差异,能够有效判别储集层流体性质。但目前还不能实现定量化评价,指导意义受限。将余弦相似度原理引入到气测曲线峰型形态定量化评价中,选取不同流体类型的标准峰型形态作为原型计算余弦相似度,对每种峰型的相似度赋以不同权重系数,通过综合计算得出“峰型指数”,可以有效对气测曲线峰型形态进行定量化评价;进一步将“峰型指数”与气测全烃值特征参数、气测组分值特征参数结合构建三维解释图板,发现不同性质流体区分效果明显。经过实际应用验证可知,综合解释吻合率为82.6%(与试油结论对比),能够满足生产需求。

The configuration characteristics of the peak shape of the gas logging curve can reflect the vertical difference of reservoir fluid, and can effectively discriminate the fluid properties of the reservoirs. But the quantitative evaluation cannot be realized at present, and the guiding significance is limited. The cosine similarity principle is introduced into the quantitative evaluation of peak configuration of gas logging curve. By selecting the configuration of the standard peak shape of different fluid types as the prototype to calculate the cosine similarity, the similarity of each peak shape is assigned with different weight coefficients, and the peak shape index is obtained by comprehensive calculation, which can effectively carry out quantitative evaluation on the configuration the peak shape of gas logging curve. Furthermore, the peak shape index was combined with the characteristic parameters of total hydrocarbon value and component value of gas logging to construct the three-dimensional interpretation chart, it is found that the boundaries of different fluid properties are obvious. It is proved by practical application that the coincidence rate of comprehensive interpretation is 82.6%(compared with the conclusion of well test), which can meet the production demands.