钻时比值与烃对比系数交会图在气测解释中的应用

利用气测录井钻时资料计算储层钻时比值,利用全烃资料计算烃对比系数,建立钻时比值-烃对比系数交会图,并按区域试油资料统计确定油气层、含烃水层、干层界线标准,将交会图划分为油气层、含烃水层、干层三个区域,用于解释评价气测录井油气异常显示层。该解释方法适用于低阻油气层、裂缝性油气层、页岩气层,特别是在弱油气显示、单一组分显示层中广泛应用,较三角形图版、PIXLER图版、双轻烃烷比值、烃类比值(3H)等传统的气测录井解释方法适用范围广,解释精度高。

Application of Crossplot of Drilling Time Ratio and Hydrocarbon Contrast Coefficient in Gas Logging Interpretation

Drilling time ratio-hydrocarbon contrast coefficient crossplot is established based on the drilling time ratio of reservoir calculated by means of gas-logging drilling time data and hydrocarbon contrast coefficient calculated by means of total hydrocarbon data and is divided into oil-gas layer,hydrocarbon-contained water layer and dry layer in line with the definition standard to define the three layers according to the statistics of regional oil testing data,which is used to interpret and evaluate gas logging abnormal indication formation.The interpreting method is suitable to low resistant oil-gas formation,fractured reservoir and shale gas formation,and especially widely used in weak hydrocarbon indication and single component indication layer.It has wider range of application and higher accuracy of interpretation than traditional gas-logging interpreting methods such as triangle plate,PIXLER plate,twin-light hydrocarbon-based methane ratio as well as hydrocarbon ratio（3H）.