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针对大庆油田葡南地区老井浅层没有完井测井信息不能进行气层评价的问题,在套管井中进行中子寿命测井和补偿中子测井,基于气层的测井响应特征,给出了定性识别气层的2个有效参数以及4组重叠曲线,利用套管井中子寿命远探测器俘获计数率曲线和补偿中子远探测器计数率曲线首次建立了钙层指示曲线,能够有效地区分钙层与气层,实现了气层快速直观精细解释。利用中子寿命测井近、远探测器俘获计数率以及热中子宏观俘获截面测井曲线组建了一条对气层识别比较敏感的GI1曲线,利用该曲线建立了新的含气饱和度模型,对气层进行了定量解释。以试气资料为基础,综合气层定性、定量识别方法,确定了气层、气水同层、水层的多参数判别标准。经过试气验证表明该解释方法正确,能够满足大庆油田葡南地区老井浅层天然气评价工作需要。
Aiming at the problem that the gas well can not be evaluated without well logging information in the shallow wells of the Wells in the southern part of the southern Daqing oilfield, neutron lifetime logging and compensated neutron logging are used in the cased wells. Based on the well logging response characteristics, Two valid parameters for qualitatively identifying gas layers and four overlapping curves are given. It is the first time to establish a Ca2 + curve by using the neutron lifetime of the cased-hole neutron detector and the count rate curve of the compensated neutron far detector. Effectively distinguish between the calcium layer and the gas layer, to achieve a quick and intuitive interpretation of the gas layer. A new GI1 curve, which is sensitive to the gas zone identification, is established by using the neutron lifetime log near and far detector capture rates and the thermal neutron macro trapping cross-section log curves. A new gas saturation model is established by using this curve. The gas layer was explained quantitatively. Based on the test gas data and the method of qualitative and quantitative identification of the integrated gas reservoir, multi-parameter discriminant criteria of gas, gas and water layers and water layers are determined. After the test of gas proved that this method of interpretation is correct, it can meet the needs of shallow well gas evaluation in Lao well in the southern part of the southern part of the southern Daqing oilfield.