利用套管井补偿中子时间推移测井识别气层及侵入

THE APPLICATION OF TIME-LAPSED CNL IN CASED HOLE TO THE IDENTIFICATION OF GAS RESERVOIR AND MUD FILTRATE INVASION

根据泥浆侵入气层前后补偿中子测井响应值的变化 ,设计了套管井内补偿中子时间推移测井试验。结果表明 ,该方法对识别渗透率在 (1～ 3)× 10 -3 μm2 以上的砂岩气层有明显效果 ,为鄂尔多斯盆地上古生界低渗透砂岩可疑气层、低阻气层。

Based on the different responses of compensated neutron log (CNL) in the gas reservoir before and after mud filtrate invasion, the authors designed the test of time-lapsed CNL in cased hole. The result indicates that time-lapsed CNL is effective in gas identification of a reservoir whose permeability is higher than (1～3)×10 -3μm 2. The test has provided a new method for the interpretation of the questionable, low resistivity or mud contaminated reservoir and for the restudy of old well data.