井海电磁法一维正演模拟  

1D forward modeling for marine borehole electromagnetic

作　　者：冯许魁[1,2] 王堃鹏[3] 曹辉[1] 蓝星[4] 

机构地区：[1]成都理工大学地球探测与信息技术教育部重点实验室,四川成都610059 [2]中国石油东方地球物理公司,河北涿州072750 [3]中国地质大学(北京)地球物理与信息技术学院,北京100083 [4]四川省蜀通岩土工程公司,四川成都610000

出　　处：《石油地球物理勘探》2014年第6期1222-1227,8,共6页Oil Geophysical Prospecting

基　　金：国家自然科学基金项目(u1262206和41174092)联合资助

摘　　要：井海电磁法是将垂直双极线源置放在海底油气井中,供以交流电,在海底或海面接收电磁场响应以监测海底油气藏在开发过程中的变化,此法是一项以较低的成本监测海底油气藏开发的技术。井海电磁在国际上已经逐渐受到海洋油气开发研究的关注。根据垂直电偶极子在海洋一维层状介质中电磁场响应公式,将有限长线源离散成有限个垂直电偶极子,通过叠加原理,模拟整个有限长线源在任意观测点的电磁响应。为此设计了深海、浅海和已知储层下方含有未知储层等模型,得到了将垂直双极源分别放置于深海和浅海海底油气井中一维模型的正演计算结果,结果表明,井海电磁独特的激发模式不仅适合深海油气开发,在浅海受到空气波干扰也较小,对于中国海洋油气的开发具有实际意义。Placing a borehole vertical bipole source into a metal case of oil drilling well and supplying alternating current is a new cheap method to detect the underground dynamic conductor and monitor the seafloor oil-gas method.This method has gradually drawn attention in internationally.We place a borehole vertical bipole into a marine metal case of oil drilling well and derive the electromagnetic response expression of vertical dipole in one dimensional marine stratiform medium.We disperse the finite line source into a number of finite vertical dipole so that we can simulate the whole line source though superimposing electromagnetic response of every single vertical dipole because of principle of superposition.Besides,we design deep sea,shallow sea model and the mode which under the reservoir has un-known reservoir.We obtain one dimensional forward simulation results when bipole is placed in deep sea and shallow sea respectively.The results show that the special mode of this method is very useful and accurate for prospecting oil and gas in deep sea.Meanwhile this method also has little disturbance from air wave and has real meaning for Chinese marine oil and gas development.

关 键 词：垂直双极源 垂直电偶极子 一维 

分 类 号：P631[天文地球—地质矿产勘探]