【摘要】 基于测井资料和地震层速度预测盆地地层压力,结合实测压力和泥浆数据,从琼东南盆地测井资料和地震资料入手,综合前人的研究成果,分析了琼东南盆地地层压力分布特点,总结了琼东南盆地异常地层压力分布规律,认为此盆地单井压力类型可以划分为常压、微超压、超压;超压出现的层位,层速度剖面上出现速度反转现象,在凹陷中心易形成强超压体;上渐新统陵水组压力平面上发育陵水凹陷、松南宝岛凹陷、乐东凹陷等强超压凹陷,具有从北向南、从西向东超压逐渐增强、超压范围增大的特点。在此基础上,分析了琼东南盆地的超压成因机理,认为该盆地上高达110m/Ma的沉降速率造成的不均衡压实是该盆地上超压层形成的主要成因;高达105m/Ma的沉降速率、较高的地温梯度引起的生烃作用以及断层活动性减弱、封堵性增强共同控制着下超压层的形成。更多还原

【Abstract】 Started from logging data,combined with the test pressure data and plentiful mud fluid data,distribution characteristics of formation pressure in Qiongdongnan basin is analyzed.On the base of these and combined with previous research results,we summarize the distribution of overpressure in the basin.That is,characteristics of individual wells can be summed up into four types,which include normal pressure,micro-super-pressure,super-pressure and high pressure.High-pressure bladders appear on profile,which overpressure regimes can easily form in inner of sags.On the plane,high overpressure in the Lingshui Formation of Oligocene exists in Lingshui,Songnan-Baodao,Ledong Sag and so on.Generally,overpressure enhanced gradually from north to south,from west to east.On this basis,the mechanism of the basin overpressure is analyzed,and suggests that disequilibrium compaction caused by subsiding rate of up to 110m/Ma is the major factor for the formation of overpressure stratum.The formation of overpressure stratum is the result of subsiding rate of up to 105m/Ma,hydrocarbon-generation caused by high geothermal field,as well as weakened fault activity and enhanced sealing.更多还原