芦龙地震前后邻近地区油井油水气动态异常分析

本文分析了华北地区部分油井油、水、气动态资料。歧口647井、塘11井、塘12井、旺11井震前2—5个月分别开始出现异常变化,最大异常幅度约为正常背景值的1—3倍。塘18井震前半个月出现突升突降变化,幅度竟达震前值的15倍。可以认为这种变化是芦龙5.3级地震前的短临震兆信息。文章还就油、水、气动态变化形成机理作了解释,提出自喷井测试构造应力活动的最佳观测方法是闭井测压。

ANALYSIS OF ANOMALOUS STATUS OF OIL WELLS IN THE VICINITY BEFORE AND AFTER THE MAGNITUDE 5.3 EARTHQUAKE OF LULONG

The status of oil, water and gas in some oil wells in North China has been analysed. It is considered that there were immediate earthquake precursors prior to the magnitude 5.3 earthquake of Lulong. The anomalous variations were respectively initiated from two to five prior to earthquake in oil wells, such as well No.647 of Qikou, well No.11 and No.12 of Tanggu and well No.11 of Dazhongwang. The anomalous amplitude increased to 1-3 times higher than that of the normal background level. The sudden changes in which the amplitudes were even fifteen times higher than the level prior to shock, occurred half before the earthquake in the well No.18 of Tanggu. In the study the emergent mechanism for variations of oil, water and gas status is discussed. It is proposed that the best of observation procedure for examining the tectonic stress of the pusher type well is to datermine the pressure of the closed well.