| 随钻中子孔隙度测井响应特性数值模拟 |
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| 引用本文： | 袁超,李潮流,周灿灿,张锋.随钻中子孔隙度测井响应特性数值模拟[J].地球科学,2014,39(12):1896-1902. |
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| 作者姓名： | 袁超 李潮流 周灿灿 张锋 |
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| 作者单位： | 1.中国石油勘探开发研究院测井与遥感技术研究所, 北京 100083 |
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| 基金项目： | 国家重大油气专项，国家自然科学基金项目 |
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| 摘 要： | 随钻中子孔隙度测井在随钻地层评价中发挥重要作用, 对其响应特性研究具有重要意义.利用蒙特卡罗方法建立随钻条件下地层模型, 模拟研究随钻中子孔隙度测井响应特性.模拟结果表明: 随钻和电缆测井相同条件下中子孔隙度响应变化趋势相同, 随钻中子孔隙度曲线反映孔隙度灵敏程度高于电缆测井, 但其测井响应受钻铤影响较大; 探测深度与地层孔隙度有关, 文中条件下探测深度和纵向分辨率分别为28 cm和19 cm; 在水平井和大斜度井中, 测量方位对中子孔隙度曲线影响较大; 相对倾角α越小, 中子孔隙度曲线过渡区域中点越接近地层界面; α小于60°时, 中子孔隙度曲线受围岩影响可忽略.
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| 关 键 词： | 随钻测井 中子孔隙度 响应特性 数值模拟 |
| 收稿时间： | 2014-03-04 |
Numerical Simulation of Response Characteristic of Neutron Porosity Logging While Drilling |
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| Yuan Chao,Li Chaoliu,Zhou Cancan,Zhang Feng.Numerical Simulation of Response Characteristic of Neutron Porosity Logging While Drilling[J].Earth Science-Journal of China University of Geosciences,2014,39(12):1896-1902. |
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| Authors: | Yuan Chao Li Chaoliu Zhou Cancan Zhang Feng |
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| Abstract: | Neutron porosity logging while drilling (LWD) plays an important role in formation evaluation under LWD environment, so it has a great significance to study the logging response characteristic. Monte Carlo method is employed to build formation modeling under LWD conditions, and the response characteristic is simulated. The results reveal that the changing trend of porosity response of neutron logging while drilling is similar to that of wireline under the same conditions, the sensitivity of porosity curve in LWD to porosity is higher than wireline, but the neutron porosity logging response of LWD is affected severely by the drilling collar. The depth of investigation is related to formation porosity, and the depth of investigation and vertical resolution under the conditions in this paper is 28 cm and 19 cm, respectively. In high angle and horizontal wells, the effect of measurement azimuth on neutron porosity curve is slight. When the relative dip α is low, the midpoint of transition area of neutron porosity curve is close to the boundary surface. If α is less than 60°, the effect of the adjacent formation on porosity curve can be ignored. |
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| Keywords: | logging while drilling neutron porosity response characteristic numerical simulation |
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