地层异常压力的定量评价方法

Quantitative Evaluation of Abnormal Formation Pressure

禹　荣,曾喜生,许庆国

Yu Rong ，ZengXisheng, Xu Qingguo

中原石油勘探局地质录井处

Geologic Logging Company , Zhongyuan Petroleum Exploration Bureau,SINOPEC, Henan 457001 , P. R. China

地层异常压力是油气勘探中重要的研究课题。文中介绍了地层异常压力定量评价的3 种方法———当量深度法、比率法和伊顿法。当地层压力较低时(压力系数小于1.4) ,伊顿法和比率法的结果较为准确;当地层压力较高时(压力系数大于114) ,适合用当量深度法。这3 种方法都是建立在正常的压实曲线之上的,使用中应合理地选择压实参数,建立其正常的压实曲线。

Abnormal formation pressure occurs widely in nearly all sedimentary basins, which is one of the most important subject s in oil and gas exploration. Three methods are laied emphasis on introduction , equivalent depth method , ratio method and Eation method. When the formation pressure is lower, in which its pressure coefficient is lower 1.4, the result of using Eation and ratio method is accurate relatively ;when the pressure is high , in which the coefficient is more than 1.4, the equivalent depth method is available. Based on the normal compaction curve , compaction coefficient must be chosen reasonably , and found up really compaction curve.