蒙特卡罗模拟是放射性测井一种重要的数值模拟方法，利用通用程序MCNP可方便地建立各种地层模型，为放射性测井研究提供了简便有效的方法。借助于蒙特卡罗方法建立随钻条件下地层模型，正演模拟随钻方位伽马成像特征。结果表明，随钻方位伽马成像图呈现正弦线特征，利用成像图可准确反演井眼相对倾角和放射性地层厚度；井眼相对倾角越大，放射性地层厚度越厚，成像图的正弦线高度值及在井轴方向上的展布高度值越大；井眼尺寸对利用成像图求取井眼相对倾角没有影响，但对计算放射性地层厚度有影响，仪器偏心对利用成像图求取井眼相对倾角和放射性地层厚度都有较大影响，若伽马计数满足测井计数统计性，可忽略井眼流体对成像图的影响。
Monte Carlo simulation is one of the most important numerical simulation methods in nuclear logging. Formation models can be conveniently built with MCNP code, which provides a simple and effective approach for fundamental study of nuclear logging. Monte Carlo method is employed to set up formation models under logging while drilling condition, and the characteristic of azimuthal gamma imaging is simulated. The results present that the azimuthal gamma imaging shows a sinusoidal curve features. The imaging can be used to accurately calculate the relative dip angle of borehole and thickness of radioactive formation. The larger relative dip angle of borehole and the thicker radioactive formation lead to the larger height of the sinusoidal curve in the imaging. The borehole size has no affect for the calculation of the relative dip angle, but largely affects the determination of formation thickness. The standoff of logging tool has great influence for the calculation of the relative dip angle and formation thickness. If the gamma ray counts meet the demand of counting statistics in nuclear logging, the effect of borehole fluid on the imaging can be ignored.
参考文献
| [1] | 徐英;洪治.[J].浙江大学学报（工学版）,201246(05):899. |
| [2] | YE Ting;CHAI Pei;GAO Juan.[J].Chinese Physics C,201135(12):1166. |
| [3] | DAI Wei;SHUI Zhonghe;SHEN Chunhua.[J].Journal of The Chinese Ceramic Society,201240(01):149. |
| [4] | 赵胜喜;祁影霞.[J].制冷技术,201240(11):37. |
| [5] | 王文;史琳.[J].工程热物理学报,200223(04):401. |
| [6] | 王屏;高笑舸;张坚磊.[J].中国新药杂志,201221(03):335. |
| [7] | DING Junjie;ZHANG Yunjian.[J].Acta Pharmacolog-ica Sinica,201233:1431. |
| [8] | 柴洪.[J].项目管理技术,201210(11):79. |
| [9] | 陈国栋.[J].财会月刊,20126:59. |
| [10] | TAN Gang.[J].Journal of Central South University of Tech-nology,201219(03):733. |
| [11] | 方再根.计算机模拟和蒙特卡洛方法[M].北京:北京工业学院出版社,1988:55. |
| [12] | 黄隆基.放射性测井原理[M].北京:石油工业出版社,1985:35. |
| [13] | GARNDER R P;XU L B;WANG J X.Some Lessons Learned From MCNP Usage[A].,2007 |
| [14] | 张辛耘;王敬农;郭彦军.[J].测井技术,200630(01):10. |
| [15] | 邹德江;范宜仁;邓少贵.[J].石油仪器,200519(05):1. |
| [16] | 秦绪英;肖立志;索佰峰.[J].勘探地球物理进展,200326(04):313. |
| [17] | MIRTO E;WELLER G;EL-HALAWANI T.New Development in Sourceless Logging-While-Drilling Forma-tion Evaluation:A Case Study from Southern Italy[A].,2006 |
| [18] | WELLER G;EL-HALAWANI T;TRIBE I.New Integrated LWD Platform Delivers Improved Drilling Ef-ficiency, Well Placement, and Formation Evaluation Ser-vices[M].Offshore Europe,2005 |
| [19] | BRIESMEISTER J F.[J].Los Alamos National Laboratory Report,2000 |
| [20] | WANG J X;HUISZOON C;XU L B.Quantitative Study of Natural Gamma Ray Depth of Image and Dip An-gle Calculations[A].,2013 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%