摘要
在缺少自然伽马能谱测井信息时,高铀地层泥质含量计算一直是测井定量评价的一个难题。通过对研究区8口自然伽马能谱测井资料进行分析,建立CGR和GR、CNL等的相关关系,构建了新的无铀伽马曲线,并通过反褶积提高分辨率,再平滑滤波处理,消除不正常的抖动和突跳,最终得到了新的CGR曲线。计算结果与实测无铀伽马曲线进行对比验证,吻合较好。构建的CGR曲线模型推广应用至研究区其他未进行自然伽马能谱测井的井中,较好地解决了高铀地层泥质含量计算问题。
The layer of high uranium strata has high natural gamma ray value in the studied area, but it is not caused by shale content and can＇t reflect the true value of the clay. In the case of lack of Natural Gamma Ray Spectrometry logging information, the calculation of clay content in the high uranium strata is hard in logging quantitative evaluation. In this paper, the writers establish a new non-uranium gamma curves by analyzing the relationship between CGR and GR and CNL in the eight wells with GRS data. And then, make the deconvolution to improve resolution and smooth the filter to remove the normal jitter and sudden jump,finally, get the new CGR curves. The measured results are in good agreement with those calculated. The new CGR model is used in other wells without the Gamma Ray Spectrometry log data in the studied area, the problem of calculation of the clay content in high uranium strata is solved by using the new CGR value.
出处
《测井技术》
CAS
CSCD
北大核心
2013年第3期244-248,共5页
Well Logging Technology
基金
"十二五"国家重大专项(编号:2011ZX05031-002-006HZ)
西南石油大学研究生创新基金(GIFSB1105)资助
关键词
测井方法
处理解释
无铀伽马
自然伽马
高铀地层
泥质含量
曲线重构
logging method
log interpretation
no uranium gamma
natural gamma
high uranium strata
shale content
curve reconstruction
