气测录井烃组分数据采集不全问题的研究

从吉林探区录井生产的实际情况出发,结合吉林探区的地质特点及油藏特征,全面分析了气测录井组分数据采集不全问题产生的原因。结果表明,吉林探区低孔、低渗薄互层砂岩体形成的岩性油气藏油气比偏低、油藏伴生气的重烃含量偏低是造成气测录井采集不到乙烷以后重烃组分值的内因,个别录井仪及软件设置的缺陷是造成气测录井采集不全组分值的外因。在不更换A/D板的情况下,通过调整放大器输出最小值和尽可能提高最小检知体积分数的电压值,解决了低体积分数组分值的采集问题,对相同类型油气藏气测录井数据采集具有指导意义。

Study on the problem of data acquisition incompleteness for gas logging hydrocarbon components.

In view of the actual situations of Jilin prospect area mud logging operation, combining with its geological features and oil reservoir characteristics, the paper made a comprehensive analysis to the causes which resulted in incompleteness of gas logging components acquisition. The results showed that in Jilin prospect area, oil-gas ratio of lithologic hydrocarbon reservoir, formed by low porosity and low permeability thin interbed sand body, was low, and the low heavy hydrocarbon content of oil reservoir associated gas was the internal cause of leading to the heavy hydrocarbon component value after ethane not to be detected in gaslogging. The defects of individual mud logging unit and software setting were the external causes which made the gas logging components acquisition incomplete. Under the condition of not changing A/D card, through adjusting amplifier output minimum and increasing voltage magnitude of minimum sensing volume fraction as high as possible, the problem of low volume fraction component value acquisition could be solved. The paper would have guiding significance for gas logging data acquisition of same type of hydrocarbon reservoir.