钻井液有机处理剂烃组分特征对气测录井的影响与储集层解释评价

Influence of hydrocarbon component characteristics of drilling fluid organic treating agent on gas logging and reservoir evaluation and interpretation

钻井液有机处理剂与地层气的叠加效应给气测录井识别油气显示及解释评价造成极大影响。为运用分析色谱峰值特征的方式判别真假气测显示,采用处理剂样品的VMS分析数据,归纳了有机处理剂在色谱分析曲线上显示正序列、反序列及无规律3种独特形态,以烃组分特征变化作为分析重点,采用扣除烃组分基值的方法获得准确的烃组分数据;对于不同有机处理剂影响下的储集层解释,(近)反序列组分峰值特征处理剂影响时,气测图板解释主要参考C_1、C_2值;无规律以及(近)正序列组分峰值特征处理剂影响时,采用基值扣除法进行气测解释,应用实践表明,不同处理剂烃组分特征条件下利用相应方法及参数进行解释评价,可实现储集层流体性质的准确判断。

The superimposed effect of organic treating agent in drilling fluid and formation gas has great impact on identifying oil and gas shows and the evaluation and interpretation in gas logging.By analyzing the characteristics of chromatographic peak to identify true or false gas logging shows and adopting VMS analytical data of treating agent sample,the authors summarized 3unique forms of the organic treating agent on chromatographical analysis curves,that is,positive sequence,reverse sequence and irregularity.The feature change of hydrocarbon components was taken as the focus of analysis,the accurate hydrocarbon component data can be obtained by deducting hydrocarbon component base value.For the reservoir interpretation under the influence of different organic treating agents,that is,under the influence of treating agent that is peak characteristics of near reverse-sequence component,the main reference values C1 and C2 can be used for gas logging chart interpretation,under the influence of treating agent that is peak characteristics of the irregularity and near positive sequence,the base value deduction method is used to gas logging interpretation,the accurate judgment of reservoir fluid properties was finally realized.