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Wang L.,China University of Petroleum - Beijing | Mao Z.,China University of Petroleum - Beijing | Sun Z.,Petrochina | Luo X.,Petrochina | And 2 more authors.
The Scientific World Journal | Year: 2013

In the Junggar basin, northwest China, many high gamma-ray (GR) sandstone reservoirs are found and routinely interpreted as mudstone non-reservoirs, with negative implications for the exploration and exploitation of oil and gas. Then, the high GR sandstone reservoirs' recognition principles, genesis, and log evaluation techniques are systematically studied. Studies show that the sandstone reservoirs with apparent shale content greater than 50% and GR value higher than 110API can be regarded as high GR sandstone reservoir. The high GR sandstone reservoir is mainly and directly caused by abnormally high uranium enrichment, but not the tuff, feldspar or clay mineral. Affected by formation's high water sensitivity and poor borehole quality, the conventional logs can not recognize reservoir and evaluate the physical property of reservoirs. Then, the nuclear magnetic resonance (NMR) logs is proposed and proved to be useful in reservoir recognition and physical property evaluation. © 2013 Liang Wang et al. Source


Jiao L.,Xian Shiyou University | Jiao L.,Northwest University, China | Wang X.,Xian Shiyou University | Bing S.,Xian Shiyou University | And 2 more authors.
RSC Advances | Year: 2015

The quantitative structure property relationship (QSPR) for the photolysis half-life (t1/2) of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) on spruce (Picea abies (L.) Karst.) needle surfaces under sunlight irradiation was investigated. Molecular distance-edge vector (MDEV) index was used as the structural descriptor of PCDD/Fs. The quantitative relationship between the MDEV index and log t1/2 was modeled by using multivariable linear regression (MLR) and artificial neural network (ANN) respectively. Leave-one-out cross validation and external validation were carried out to assess the prediction ability of the developed models. For the MLR method, the prediction root mean square relative error (RMSRE) of leave-one-out cross validation and external validation is 3.47 and 4.25 respectively. For the ANN method, the prediction RMSRE of leave-one-out cross validation and external validation is 2.68 and 3.52 respectively. It is demonstrated that there is a quantitative relationship between the MDEV index and log t1/2 of PCDD/Fs. Both MLR and ANN are practical for modeling this relationship. The developed MLR model and ANN model can be used to predict the log t1/2 of PCDD/Fs. Thus, the log t1/2 of each PCDD/F congener was predicted by using the developed models. © The Royal Society of Chemistry 2015. Source


Jiao L.,Xian Shiyou University | Jiao L.,Northwest University, China | Xue Z.,No 203 Research Institute Of Nuclear Industry | Wang G.,No 203 Research Institute Of Nuclear Industry | And 2 more authors.
Chemometrics and Intelligent Laboratory Systems | Year: 2015

Retention time shift is a significant impediment against analyzing chromatographic fingerprints of Traditional Chinese Medicine (TCM) with similarity estimation and pattern recognition methods. This work aims at developing a fingerprint preprocessing method that can eliminate the negative effect of retention time shift on similarity estimation and pattern recognition analysis in the quality evaluation of TCM. Both simulated chromatograms and experimental chromatographic fingerprints of Radix Puerariae thomsonii (RPT) were investigated in order to evaluate the practicality of the proposed method. Fourier transform (FT) was used to process these chromatographic signals. The magnitude data of these signals were calculated. In the obtained magnitude data, the negative effect of retention time shift was successfully excluded. Thus, the quality of the investigated RPT samples can be correctly evaluated by using the magnitude data as the input variables of similarity estimation and pattern recognition analysis. It is demonstrated that FT is a practicable and promising method for preprocessing chromatographic fingerprints of TCM prior to similarity estimation and pattern recognition analysis. © 2014 Elsevier B.V. Source


Wang B.,No 203 Research Institute Of Nuclear Industry | Li Q.,No 203 Research Institute Of Nuclear Industry
Yejin Fenxi/Metallurgical Analysis | Year: 2016

The step-by-step acid dissolution method was adopted. The sample was firstly dissolved with H2SO4-HClO4-HF; then, HNO3 was used as redissolution acid; finally, HCl(1+3) was used as medium acid. Fe 259.94 nm was selected as the analytical line. The content of total iron in uranium ore was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). When the mass concentration of iron was in range of 14-224 μg/mL, the linear correlation coefficient of calibration curve was r=0.9999. The detection limit of total iron was 1.25×10-4%. The proposed method was applied to the determination of total iron in six national certified reference materials of uranium ore, including GBW04117-GBW04122.The relative standard deviations (RSD, n=20) were between 1.2% and 3.6%, and the found results were consistent with the certified values. The content of total iron in ten actual uranium ore samples was also determined according to the experimental method, and the found results were consistent with those obtained by EJ/T 297.3-1987. The total iron in certified reference materials was determined according to the experimental method and EJ/T 297.3-1987. The determination results of two methods were compared. The F test and t rest indicated that the proposed method and EJ/T 297.3-1987 had no significant difference. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved. Source


He J.-G.,No 203 Research Institute Of Nuclear Industry | Lei Y.,No 203 Research Institute Of Nuclear Industry | Xi Z.,No 203 Research Institute Of Nuclear Industry | Li J.-A.,No 203 Research Institute Of Nuclear Industry
Dizhen Dizhi | Year: 2013

In this paper we introduce a new kind of TEM sounding configuration: Outside-loop sounding configuration, which measures a sounding spot 20~25 meters outside the loop instead of directly measuring with central-loop sounding. The characteristic of the outside-loop sounding configuration is that during high-precision sounding survey, this method can massively avoid the influence from the self-inductance of the transmitter loop compared to central-loop sounding, thus, can raise the resolution and the exploration depth of the survey. By comparative tests with central-loop sounding configuration and application to a sounding survey carried out in Turpan-Hami Basin, Xinjiang, we find that the method is effective and shall be put in use in future. Source

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