基于数值模拟的地层界面影响校正技术研究

The Research on the Correct of Formation Interface Based on The Numerical Simulation

在大斜度井/水平井特殊井眼环境下,井眼是以一定的角度钻入地层,引入了地层界面的影响。斜井、水平井与垂直井测井响应差异的主要原因是很多测井仪器是专为探测垂直于井眼的地层而设计。但是当井斜较大,影响仪器响应的地层不再是均匀的,而测量结果也变成了各个地层特征的综合反应。针对补偿中子和密度这两种放射性孔隙度测井方法,我们首先利用MC数值模拟的方法,来描述仪器的径向探测特性,然后利用模拟得到的径向探测几何因子给出核测井地层界面响应方程,以此进行地层界面影响因素的校正。

In highly deviated wells/horizontal wells special borehole environment,the borehole drill into the formation in a certain angle,the introduction of the formation interface.Inclined shaft,horizontal wells and vertical wells logging response differences mainly due to the many logging tool is designed to detect vertical in the formation of the borehole.But when wells oblique formation of affecting the response of the instrument is no longer uniform,and the measurement result becomes the integrated response of the characteristics of each stratum.For compensated neutron and density of both radioactive porosity logs method,we first use the MC numerical simulation method,to describe the radial detection characteristics of the instrument,and then use the simulated radial detect geometric factor given nuclear logging strata interface response equation,this formation interface affect the correction factors.