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本文应用体积密度、中子孔隙度、电阻率等测井资料和地层温度,研究美国威利斯顿盆地中生成大量油气的Bakken(巴肯)地层生油岩。通过主成份分析,聚类分析和判别分析的研究,表明现在的有机质分布控制了许多测井值的变化。现在的总有机碳值在蒙大拿州东北地区附近盆地中部和盆地东部边缘为高值,在纳逊(Nesson)背斜区和该盆地西南边缘为低值。应用密度对地层温度的回归分析及其残差分析,可以部分地把油气成熟度影响和沉积影响分开。这些分析结果表明,原始有机质在Bakken地层边界线附近的丰度低,在蒙大拿州东北地区增加成高值。正如测井资料统计分析所确定的那样,成熟前的总有机碳分布和现在的总有机碳分布都与地球化学分析结果相符,这种分布特点可以用Bakken地层的比较简单沉积模式和热历史来解释。
In this paper, we use the logging data of bulk density, neutron porosity, resistivity and formation temperature to study the Bakken formation in the Williston Basin, USA. The study of principal component analysis, cluster analysis and discriminant analysis shows that the current distribution of organic matter controls many changes in logging values. Present TOC values are high in the central basin near the northeastern Montana and in the eastern margin of the basin, and low in the Nesson anticline and at the southwestern margin of the basin. The regression analysis and residual analysis of the application density to the formation temperature can partly separate the impact of oil and gas maturity from the deposition. The results of these analyzes show that the abundance of the original organic matter near the Bakken formation boundary line is low and increases to a high value in the northeastern Montana region. As determined by the well log data analysis, the pre-ripe TOC and the current TOC distribution are consistent with the results of geochemical analyzes. This distribution can be characterized by the relatively simple sedimentary model of the Bakken formation and thermal history Explanation.