利用测井资料预测欠压实超压层方法研究

以欠压实作用产生的超压层为研究对象,分析了声波测井、密度测井、中子测井和电阻率测井在欠压实超压层中的响应特征,研究认为:欠压实超压地层的声波时差、中子测井响应值较正常压实情况下要大,而密度、电阻率较正常压实情况下小.其中,声波时差、电阻率的这种现象最为明显.通过对常规测井在欠压实超压层中的测井响应特征分析,提出了利用综合压实曲线判别法来识别欠压实超压层,通过对某区块井的实例分析,验证了该方法的可靠性.

Study on prediction of undercompaction overpressure layer by using logging data

Based on undercompaction overpressure layer, the response characteristics in uncompacted overpressure layer of acoustic log, density log, neutron log and resistivity log were analysed, research suggests that sonic and neutron logging response value of the normal compaction condition were less than the values of overpressure, then density and resistivity were larger, among them, the phenomenon of sonic, resistivity is the most obvious.By logging response characteristics analysis in undercompacted overpressure layer, a method of identifing undercompacted overpressure layer by using logging curves was presented.Through the analysis of examples of a block wells, the reliability of this method is verified.