【摘要】 本文论述用声波时差测井估计异常地层压力的大小,阐述了三个观点:1.估算异常地层压力的一般公式;2.孔隙度随地层埋藏深度的增加按指数规律减小,但是,在异常地层压力井段,孔隙度变化偏离这一规律;3.用声波时差测井孔隙度确定异常地层压力井段的等效深度点,从而用它来估计异常的地层压力。 异常地层压力主要用来发现高压油气层,预测岩石破裂压力强度,合理地、经济地选用钻井泥浆比重,提高钻速,保证安全,特别是用于指导海洋钻井、深井和超深井钻井以及确定完井方法等,均具有十分重要的意义。 文中还列举了应用声波时差测井估计异常地层压力的一个实例。更多还原

【Abstract】 This paper described a method of estimating abnormal formation pressures, and discusses the following: (1) conventional formula of estimating abnormal forma-tion pressures; (2) according to exponential law, the porosity decreases with increase in strata depth. However, in the intervals of abnormal pressured, the change of porosity deviates from this law; (3) the intervals of equivalent depth points of abnormal pressures were determined with the porosity obtained by the travel time of sonic logging, and then the abnormal pressures were estimated.We applied the sonic logging data to estimate abnormal pressures in the eastern part of China, and have got a good results in drilling engineering.更多还原