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Monte Carlo Simulation on Influence Factors of Density Logging in Horizontal Well
Author(s): 
Pages: 135-138
Year: Issue:  2
Journal: WELL LOGGING TECHNOLOGY

Keyword:  密度测井水平井影响因素蒙特卡罗模拟;
Abstract: 水平井随钻过程中的密度测井要受井眼尺寸、仪器和井壁的间隙、泥浆比重(含氢量)、泥饼、岩屑、水垫、泥浆侵入等环境影响.利用蒙特卡罗方法模拟水平井在改变井眼半径、地层岩性、孔隙度、岩屑厚度、储层厚度、水垫和泥浆侵入深度等条件的伽马能谱,则井眼尺寸和水垫厚度越大,远近探测器的伽马计数越高,且直线的斜率大小反映对远近探测器的影响大小;岩屑厚度越大,近探测器比远探测器的伽马计数率变化越快,地层的密度动态变化范围越小;泥浆侵入使远近探测器的伽马计数减小,且近探测器变化快,侵入深度达到12 cm后伽马计数率几乎不发生变化.水平井密度测井的探测深度大约为15 cm,为地质导向提供了理论指导作用.
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