英西地区深层录井解释评价方法

Evaluation method of deep logging interpretation in Yingxi area

青海油田英西地区深层地质条件复杂,不但井眼小,井底高温、高压,且存在多套膏盐层,井壁不规则,导致测井资料质量差,依靠测井资料解释评价油气层难度较大。为解决这一难题,通过搜集该地区已钻井的试油数据,深挖录井参数,建立组分综合指数与电导率指数交会图板、含水指数与含气指数交会图板,实现了该地区油气层的解释需求。该方法在现场实际应用效果良好,使解释符合率由64%提高到92%。这表明,基于录井技术独到的特点,深挖录井参数也可以很好地解决油气层的解释评价。

The deep geological conditions in Yingxi area of Qinghai Oilfield are complex,not only the borehole is small,the bottom is of high temperature and pressure,but also there are multiple sets of gypsum-salt layers,and the borehole wall is irregular,resulting in poor quality of logging data and difficulties in interpreting and evaluating hydrocarbon reservoirs by logging data.To solve this problem,by collecting oil test data of drilled wells in this area and studying mud logging parameters,the intersection chart of constituent comprehensive index and conductivity index and the intersection chart of water cut index and gas bearing index are established,meeting the interpretation needs of hydrocarbon reservoirs in this area.This method has a good effect in actual field application,increasing the interpretation coincidence rate from 64%to 92%.It shows that based on the unique characteristics of logging technology,deeply studying logging parameters can also well interpret and evaluate hydrocarbon reservoirs.