蒙特卡罗方法在核测井中的研究与应用

【作者】 赵国志；

【导师】 孙普男；

【作者基本信息】 黑龙江大学 ， 核技术及应用， 2010， 硕士

【摘要】 核测井技术已在国内外石油天然气勘探开发中有着广泛的应用,且较多油田进入高含水、高采出的深度开发阶段,储层油水分布不均匀,剩余油高度分散且含水度很高,各种测井方式分别获得的数据曲线较多,因此对于地层水淹情况的认识和评价对油田后期开发效果、采出效率、效益有着重要影响。本论文研究了PND测井在水淹层评价中的应用,分析了评价水淹程度的重要参数CATO值与水淹程度(含水度)的关系,并利用蒙特卡罗数值模拟程序(MCNP)模拟了含水度不同的地层,并得出对应的CATO值,建立两者的关系图,并用此图结论实际测井曲线比较,符合较好。本论文还研究了PNN测井的实际测井曲线图,发现在一些特殊地层情况下PNN测井仍可进行解释,因此利用MCNP程序模拟了超低矿化度、超低孔隙度、薄油层条件下的热中子时间谱,并求出相应的地层宏观吸收截面,最后用模拟得出的结论与实际测井曲线比较,符合较好。模拟研究结果表明,在大多数情况下,PND和PNN测井能较好的反映地层的水淹情况。更多还原

【Abstract】 Nuclear logging technology has been used widely in prospecting for oil and natural gas at home and abroad. Many oil fields are on the ground of high-containing water and high-extracting, uneven stratum oil-water distributing, separated residual oil and high water saturation. Since the data curve from these logging methods is excessive, the understanding and evaluation of flooded layer has a great influence on oil field upper development, extraction efficiency and benefit.We discuss the application of PND logging in the flooded layer evaluation and analyze the relationship between water saturation and CATO which is important to evaluate the degree of water saturation. And it is found that practical data which is plentiful can’t display the relationship between CATO and water saturation. So Monte Carlo numerical simulation program is used to simulate the stratum with different water saturation, and we obtain corresponding CATO and make the relationship chart which is compared with the practical logging data.We also analyze the practical PNN logging curve and find that some unfamiliar stratum can be explain through PNN logging. And MCNP program is used to simulate the thermal neutron time spectrums on the conditions of very low salinity, porosity and oil sheet. Then we obtain the corresponding formation macroscopic absorption cross section. Finally the simulation result is compared with practical logging data, and the result is good.The simulation results show that PND and PNN can reflect the situation of flooded layer in many conditions.更多还原