中国石油大学学报（自然科学版）2016，Vol.40Issue(6)：57-62,6.DOI:10.3969/j.issn.1673-5005.2016.06.007
低孔隙度储层碳氧比测井灵敏度提高方法
A method of improving sensitivity of carbon/oxygen well logging for low porosity formation
摘要
Abstract
Carbon/Oxygen ( C/O) spectral logging technique has been widely used to determine residual oil saturation and the evaluation of water flooded layer. In order to improve the sensitivity of the technique for low-porosity formation, Gaussian and linear models are applied to fit the peaks of measured spectra to obtain the characteristic coefficients. Standard spectra of carbon and oxygen are combined to establish a new carbon/oxygen value calculation method, and the robustness of the new method is cross-validated with known mixed gamma ray spectrum. Formation models for different porosities and saturations are built using Monte Carlo method. The responses of carbon/oxygen which are calculated by conventional energy window method, and the new method is applied to oil saturation under low porosity conditions. The results show the new method can reduce the effects of gamma rays contaminated by the interaction between neutrons and other elements on carbon/oxygen rati-o, and therefore can significantly improve the response sensitivity of carbon/oxygen well logging to oil saturation. The new method improves greatly carbon/oxygen well logging in low porosity conditions.关键词
核测井/碳氧比能谱测井/蒙特卡罗方法/地层模型/低孔储层/非线性拟合/标准谱/响应灵敏度Key words
nuclear logging/carbon/oxygen spectral logging/Monte Carlo method/formation model/low porosity reservoir/nonlinearity fitting/standard spectra/response sensitivity分类
天文与地球科学引用本文复制引用
刘军涛,张锋,张泉滢,侯国经,张皓评,丁凡..低孔隙度储层碳氧比测井灵敏度提高方法[J].中国石油大学学报（自然科学版）,2016,40(6):57-62,6.基金项目
国家自然科学基金项目(41374125) （41374125）
国家重大油气专项(2011ZX0520-002) （2011ZX0520-002）
山东省自然科学基金项目(ZR2012DM002) （ZR2012DM002）
中石油创新基金项目(2012D-5006-0302) （2012D-5006-0302）
中央高校基本科研业务费专项(14CX06071A,14CX05011A) （14CX06071A,14CX05011A）
研究生创新工程(YCX2015001) （YCX2015001）
