渤海湾地区油、水井异常与地震的关系

本文根据辽河、大港、胜利三油田的资料,初步探讨了油、水井异常与地震的关系,结果证明,地壳的应力、应变变化远较固体介质灵敏.因此,油、水井动态异常机制比较清楚.其物理基础亦比较可靠,利用油田深井的油、水动态特征进行地震预报,可能具有良好的前景.

EARTHQUAKE AND ANOMALIES IN OIL AND WATER WELL PERFORMANCES OBSERVATIONS IN BOHAI BAY

The embryonic process of earthquake tends to affect the off fields adjoining its focus,which finds its manifestation in reflections or anomalies in production of oil and water wells.In the case of oil wells,under normal conditions of production when no measures of enhancement of any kind are taken,any increase of production by a wide margin,or any sudden increase or drop of output,pressure build-up in producers and intermittent flow in individual temporarily closed strippers are all expressions of anomalies;while in the case of water wells,anomalies are expressed in the abnormal changes in water level,water conductivity and radon content of water.All these anomalies may be determined through analysis of interferences.In essence,changes in the performance of oil and water wells reflect the relationship between the interstitial water pressure of the rock body and the deformation of and damage done to the rock body,similar to hydrofracturing of oil wells.Earthquake,its embryonic stage and outburst,is a process of accumulation,release and readjustment of strain energy;and in the performance curves of oil and water wells,it is expressed as a process of sudden change and resumption to normal.Therefore,anomalies occurring to oil and water wells before and after the earthquake are cloaely related to its tremors and may be used in earthquake predictions.