小井眼加深井气测录井评价技术

Gas logging evaluation technique for deepening slim wells

小井眼加深井在石油勘探开发中是一种特殊井,由于历史的原因,其前后衔接欠佳,给气测录井过程中烃类气体含量的井间对比带来困难。针对此问题,在阐述小井眼加深井特点和对气测录井气体显示值影响的基础上,系统探讨了正确识别气测真假异常方式和涉及钻头尺寸的全烃校正方法。通过钻头尺寸的校正,解决了加深井钻进前后气体显示的连续可比性问题。实例分析对比表明,小井眼加深段的气测校正全烃值与邻井同一层位的显示值具有较好的可比性,可用于油气层的解释评价。

The deepening slim well is an exceptional well in oil exploration and development,and due to historical reasons, the connection between the before-large hole and behindslim hole isn't good,which brings difficulties for hydrocarbon gases content of well-to-well correlation during gas logging. In view of this problem,based on setting forth the features of deepening slim wells and their effects exerted on the gas displayed values of gas logging,the paper systematically discussed the correct means of identifying true and false abnormalities and total hydrocarbon correction method involving bit size.Bit size correction could solve the problem of continuous gas show comparability in fore-and-aft drilling deepening well.The sample analysis and correlation indicated that gas logging correction total hydrocarbon values for small diameter deepened intervals had the good comparability with the same horizon's displayed values of adjacent wells,and this method can be used for interpreting and evaluating hydrocarbon reservoirs.