随钻D-D源中子孔隙度测井数值模拟  

Numerical Simulation of D-D Source Neutron Porosity Logging While Drilling

作　　者：葛云龙 骆庆锋 赵鹏飞 陈辉 贺柳琼 王虎 GE Yunlong;LUO Qingfeng;ZHAO Pengfei;CHEN Hui;HE Liuqiong;WANG Hu(Logging Technology Research Institute,China National Logging Corporation,Xi’an,Shaanxi 710077,China;Well Logging Technology Pilot Test Center,China National Petroleum Corporation,Xi’an,Shaanxi 710077,China;Changqing Branch,China National Logging Corporation,Xi’an,Shaanxi 710054,China)

机构地区：[1]中国石油集团测井有限公司测井技术研究院,陕西西安710077 [2]中国石油天然气集团有限公司测井技术试验基地,陕西西安710077 [3]中国石油集团测井有限公司长庆分公司,陕西西安710054

出　　处：《测井技术》2022年第5期517-522,共6页Well Logging Technology

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目“测井核心装备与软件平台研制”(2021DJ3905);中国石油集团测井有限公司项目“随钻孔隙度系列优化升级与集成配套”(CPL2021A02)。

摘　　要：随着中子发生器技术的进步,射频源中子发生器可将中子产额提高10倍,增大了使用氘氘(D-D)中子发生器进行动态测井的可能性。基于蒙特卡罗方法开展随钻D-D源中子孔隙度测井研究。研究结果表明:随钻D-D源中子孔隙度测井的孔隙度灵敏度明显高于氘氚(D-T)源中子孔隙度测井,与提高灵敏度后的D-T源中子孔隙度测井相近;径向探测深度主要受源距和地层减速性质的影响,受源能量的影响较小,纵向分辨率主要与源距有关;基于射频源D-D中子发生器的随钻中子孔隙度测井的测速约为Am-Be源中子孔隙度测井的三分之一,可通过缩短源距,增大探测器尺寸与气压,提高探测器计数率,实现随钻D-D源中子孔隙度测井。With the progress of the neutron generator technology,radio frequency(RF)source neutron generator can increase the neutron yield by 10 times,which increases the possibility of using the deuterium-deuterium(D-D)neutron generator for dynamic logging.In this paper,the D-D source neutron porosity logging while drilling is studied based on the Monte Carlo method.The results show that the porosity sensitivity of D-D source neutron porosity logging while drilling is significantly higher than that of the D-T source neutron porosity logging,and close to the improved D-T source neutron porosity logging.The radial detection depth is mainly affected by the spacing and the formation slowing-down property,and less affected by the source energy.The vertical resolution is mainly related to the spacing.The logging speed of neutron porosity logging while drilling based on the RF source D-D neutron generator should be about one-third of that of Americium-Beryllium source neutron porosity logging.The detector count rate can be improved by shortening the spacing and increasing the detector size and air pressure,to realize the D-D source neutron porosity logging while drilling.

关 键 词：氘氘源 随钻中子孔隙度测井 蒙特卡罗方法 射频源D-D中子发生器 

分 类 号：P631.84[天文地球—地质矿产勘探]