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在探井中,电阻率测井一般只能分开油(气)层与水层,但不能分开油层与气层。声波差值法是一个有效的评价砂岩气层方法。根据胡杰同志统计,在别古庄油田使用声波差值法评价砂岩含气层,解释符合率达到89.4％。采用声波差值法评价气层的主要优点是:1.消除了声波仪器刻度不准确的误差;2.能抵消分散泥质和一部分岩性成份的影响,突出天然气对声波测井信息的贡献。
In exploratory wells, resistivity logging generally separates the oil and gas layers, but not the oil and gas layers. Sound wave difference method is an effective method to evaluate sandstone gas. According to statistics by Comrade Hu Jie, the gas-bearing sandstone was evaluated in the Beiguzhuang oilfield using sound-wave difference method, explaining that the coincidence rate reached 89.4%. The major advantages of using the sound wave difference method to evaluate the gas layer are: 1. Eliminate the inaccurate error of the sonic instrument scale; 2. Can offset the influence of scattered mud and some lithologic components, highlighting the contribution of natural gas to sonic log information.