The Beibu Gulf Basin is an important oil-and gas-bearing basin offshore the China Sea,but the geological reserves of oil and gas are not very high,and there are significant differences between different sags.Previous ...The Beibu Gulf Basin is an important oil-and gas-bearing basin offshore the China Sea,but the geological reserves of oil and gas are not very high,and there are significant differences between different sags.Previous studies have shown that the formation and accumulation of oil and gas are closely related to deep structures,especially the crustal thickness or the relative undulation characteristics between the Moho and basement,but there is a lack of specific evaluation and quantitative standards.In this paper,we first invert the depth of the Moho in the Beibu Gulf Basin using satellite gravity anomalies and calculate the crustal thickness value based on this.Then,we count and analyze the crustal thickness value as well as the stretching factor that characterizes the crustal extension and thinning degree,and find that the NWW-trending contour closure of the 28 km Moho depth or 26 km crustal thickness corresponds significantly to the Weixinan-Fushan sag belt,which has already been proven to have considerable oil and gas discoveries,with a typical feature of crustal thinning to 22 km and the stretching factor reaching 1.1.Finally,we propose a comprehensive evaluation scheme based on the entropy weight method to normalize and evaluate the statistical features of the crust,and take a comprehensive score of Si>0.5 as an evaluation indicator for an oil-gas-rich sag.Based on this research,we believe that the Haizhong sag has considerable exploratory potential,followed by the Maichen sag,while the Leidong and Haitoubei sags have relatively smaller exploratory potential.The research results will help strategic decision-making of the oil and gas exploration in the Beibu Gulf Basin and provide new perspectives for studying the relationship between deep structures and the differential distribution of oil-gas-rich sags.展开更多
目的探讨并比较单指数模型、双指数模型、拉伸指数模型定量参数对乳腺癌HER2阳性状态的预测价值。方法回顾性分析67例确诊为浸润性乳腺癌患者的影像及临床资料。在病灶表观扩散系数(ADC)图像勾画感兴趣区(ROI),并对照扩散加权成像(DWI)...目的探讨并比较单指数模型、双指数模型、拉伸指数模型定量参数对乳腺癌HER2阳性状态的预测价值。方法回顾性分析67例确诊为浸润性乳腺癌患者的影像及临床资料。在病灶表观扩散系数(ADC)图像勾画感兴趣区(ROI),并对照扩散加权成像(DWI)图像修正ROI,记录病灶的表观扩散系数(ADC)、伪扩散系数(ADC_(fast))、真实扩散系数(ADC_(slow))、灌注分数(ADC_(fraction of fast))、分布扩散系数(DDC)、扩散异质性值(α)。根据免疫组化结果,将患者分为两组(HER2阳性vs.HER2阴性)。采用单因素分析比较两组间三种指数模型的六项定量参数(ADC、ADC_(fast)、ADC_(slow)、ADC_(fraction of fast)、DDC、α)组间差异。将具有统计学差异的定量参数纳入二元Logistic回归分析,并构建联合预测模型。采用DeLong检验比较三种模型定量参数、联合模型的受试者工作特征(ROC)曲线下面积(AUC),区分诊断效能。结果HER2阳性组ADC_(fast)值高于HER2阴性组(P<0.05),ADC、ADC_(slow)、DDC值低于HER2阴性组(均P<0.05)。ADC、ADC_(fast)、ADC_(slow)、DDC、ADC_(fast)-ADC_(slow)联合模型的AUC分别为75.85%、71.11%、76.92%、71.11%、88.19%;ADC_(fast)-ADC_(slow)联合模型的AUC最高,诊断效能显著优于ADC_(fast)(P=0.009),与ADC、ADC_(slow)、DDC相仿(均P>0.05);ADC、ADC_(fast)、ADC_(slow)、DDC的诊断效能组间比较表现相仿(均P>0.05)。结论三种不同指数模型定量参数有助于预测乳腺癌HER2阳性状态;双指数模型参数联合模型预测效能最优。展开更多
基金The Scientific and Technological Project of China National Offshore Oil Corporation(CNOOC)Research Institute Co.,Ltd.under contract No.CCL2021RCPS0167KQNthe Open Fund Project for the year 2022 of National Engineering Research Center of Offshore Oil and Gas Exploration under contract No.CCL2022RCPS0794RQN.
文摘The Beibu Gulf Basin is an important oil-and gas-bearing basin offshore the China Sea,but the geological reserves of oil and gas are not very high,and there are significant differences between different sags.Previous studies have shown that the formation and accumulation of oil and gas are closely related to deep structures,especially the crustal thickness or the relative undulation characteristics between the Moho and basement,but there is a lack of specific evaluation and quantitative standards.In this paper,we first invert the depth of the Moho in the Beibu Gulf Basin using satellite gravity anomalies and calculate the crustal thickness value based on this.Then,we count and analyze the crustal thickness value as well as the stretching factor that characterizes the crustal extension and thinning degree,and find that the NWW-trending contour closure of the 28 km Moho depth or 26 km crustal thickness corresponds significantly to the Weixinan-Fushan sag belt,which has already been proven to have considerable oil and gas discoveries,with a typical feature of crustal thinning to 22 km and the stretching factor reaching 1.1.Finally,we propose a comprehensive evaluation scheme based on the entropy weight method to normalize and evaluate the statistical features of the crust,and take a comprehensive score of Si>0.5 as an evaluation indicator for an oil-gas-rich sag.Based on this research,we believe that the Haizhong sag has considerable exploratory potential,followed by the Maichen sag,while the Leidong and Haitoubei sags have relatively smaller exploratory potential.The research results will help strategic decision-making of the oil and gas exploration in the Beibu Gulf Basin and provide new perspectives for studying the relationship between deep structures and the differential distribution of oil-gas-rich sags.
文摘目的探讨并比较单指数模型、双指数模型、拉伸指数模型定量参数对乳腺癌HER2阳性状态的预测价值。方法回顾性分析67例确诊为浸润性乳腺癌患者的影像及临床资料。在病灶表观扩散系数(ADC)图像勾画感兴趣区(ROI),并对照扩散加权成像(DWI)图像修正ROI,记录病灶的表观扩散系数(ADC)、伪扩散系数(ADC_(fast))、真实扩散系数(ADC_(slow))、灌注分数(ADC_(fraction of fast))、分布扩散系数(DDC)、扩散异质性值(α)。根据免疫组化结果,将患者分为两组(HER2阳性vs.HER2阴性)。采用单因素分析比较两组间三种指数模型的六项定量参数(ADC、ADC_(fast)、ADC_(slow)、ADC_(fraction of fast)、DDC、α)组间差异。将具有统计学差异的定量参数纳入二元Logistic回归分析,并构建联合预测模型。采用DeLong检验比较三种模型定量参数、联合模型的受试者工作特征(ROC)曲线下面积(AUC),区分诊断效能。结果HER2阳性组ADC_(fast)值高于HER2阴性组(P<0.05),ADC、ADC_(slow)、DDC值低于HER2阴性组(均P<0.05)。ADC、ADC_(fast)、ADC_(slow)、DDC、ADC_(fast)-ADC_(slow)联合模型的AUC分别为75.85%、71.11%、76.92%、71.11%、88.19%;ADC_(fast)-ADC_(slow)联合模型的AUC最高,诊断效能显著优于ADC_(fast)(P=0.009),与ADC、ADC_(slow)、DDC相仿(均P>0.05);ADC、ADC_(fast)、ADC_(slow)、DDC的诊断效能组间比较表现相仿(均P>0.05)。结论三种不同指数模型定量参数有助于预测乳腺癌HER2阳性状态;双指数模型参数联合模型预测效能最优。
