基于钻铤伽马信息交会的随钻中子气层识别方法  

A LWD Neutron Gas Reservoir Identification Method Based on Intersection of Drill Collar Gamma Information

作　　者：张泉滢 邢广俊 张锋 聂昕[1,2] 李宁超 刘国斌 ZHANG Quanying;XING Guangjun;ZHANG Feng;NIE Xin;LI Ningchao;LIU Guobin(Key Laboratory of Ministry of Education for Oil and Gas Resources and Exploration Technology(Yangtze University),Wuhan,Hubei 430100,China;College of Geophysics and Petroleum Resources,Yangtze University,Wuhan,Hubei 430100,China;School of Earth Science and Technology,China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430000 [2]长江大学地球物理与石油资源学院,湖北武汉430000 [3]中国石油大学地球科学与技术学院,山东青岛266580

出　　处：《西安石油大学学报（自然科学版）》2024年第3期128-136,共9页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金项目“致密气层快中子散射双粒子探测方法研究”(41974127);油气资源与勘探技术教育部重点实验室(长江大学)开放基金资助项目“裸眼井D-T源中子孔隙度测井方法研究”(K2021-05)。

摘　　要：基于数值模拟方法开展钻铤次生伽马气层识别方法研究。从总非弹和俘获伽马信息中获取钻铤次生伽马产额信息,分析其在气/水层的响应差异,提出了一种基于钻铤非弹伽马和俘获伽马产额信息交会的气层识别方法,并对环境影响因素进行了分析。研究结果表明,相比于总非弹和总俘获伽马信息,钻铤的非弹和俘获伽马产额在气层识别方面具有更高的灵敏度;基于钻铤非弹伽马和俘获伽马交会的气层识别方法不但摆脱了对孔隙度信息的依赖,而且几乎不受井径和泥质含量的影响。该研究可以为改善随钻气层识别效果提供新的思路。The gas-reservoir identification based on drill collar secondary gamma information is studied in the paper by means of numerical simulation.A gas-reservoir identification method based on the cross plot of inelastic gamma and captured gamma of drill collar is proposed by obtaining the secondary gamma yield information of drill collar from the total inelastic and captured gamma information and analyzing the response difference of it between gas and water layers,and the influence of environmental factors on the new method is studied.The results show that the inelastic gamma and captured gamma yield of the drill collar are more sensitive than the total inelastic gamma and captured gamma information in gas-reservoir identification,the gas-reservoir identification method not only gets rid of the dependence on porosity,but also is hardly affected by borehole size and shale content.This research can provide new ideas for improving the identification effect of gas-reservoir in LWD.

关 键 词：油气储集 随钻气层识别 钻铤次生伽马 灵敏度 交会图 环境影响 

分 类 号：TE122.2[石油与天然气工程—油气勘探]