应用地层水分析进行气测解释的方法探讨

Identification and interpretation of formation water by gas logging data

油、气、水在储集层内很少是单独存在的,大多以两相或者三相共存的形式存在,因此准确分析地层的含水特征,排除地层水对气测解释的干扰十分必要。冀东油田断块破碎,圈闭类型多,油、气、水分布状态复杂,尤其是在高尚堡、柳赞和柏各庄等已经注水开发的区块,地下流体分布情况更为复杂,识别难度增大。通过总结未灌满水、水溶气水、游离气水和蒸发水的气测特征,在进行气测解释时重点分析地层是否含水,解决了在气测解释中地层含水识别不清的问题,并在冀东油田10口井23层进行了实际应用,解释符合率达到86.96%,切实提高了现场气测录井的解释水平。

Oil,gas and water rarely exist alone in the reservoir,and most of them exist in the form of two-phase or three-phase coexistence,so it is necessary to accurately analyze the water signature of the formation and eliminate the interference of formation water to gas logging interpretation.The fault blocks in Jidong Oilfield are broken,there are many types of traps,and the oil,gas and water distribution are complex,especially in Gaoshangpu,Liuzan and Bogezhuang blocks which have been waterflooded,the distribution of subsurface fluid is more complex and the identification is more difficult.In the process of gas logging interpretation,the emphasis is laid on analyzing whether the formation contains water or not,which solves the problem of unclear identification of formation water cut in gas logging interpretation.Practical application in 23 layers of 10 wells in Jidong Oilfield shows that the interpretation coincidence rate reaches 86.96%,which effectively improves the interpretation level of field gas logging.