Abstract Activation energy distribution from kerogen kinetics study contains some integral characteristics of the host source rock thermal history over geological time scales. Extracting relevant information from pyrogram is critical for reconstruction of source rock maturation and hydrocarbon generation histories. In this study, in order to improve understanding of the Bakken shale source rock, we present a new quantitative kinetic model by inversion of Rock-Eval pyrograms of the Bakken Formation in Williston Basin. A group of core samples from both Upper and Lower Members of the Bakken Formation were collected for estimating transformation ratio (TR) and pyrolysis analysis, and an inversion method with different kinetic statistic parameters was designed and conducted using the source rock Tmax-Hydrogen Index covariation combined with different burial histories. The analysis of Rock-Eval results on Williston Basin samples from both Canada and US sides demonstrate basin-wide organic matter characteristics of Upper and Lower Bakken and identify variation of hydrocarbon generation histories. The Upper and Lower Bakken shales have different kerogen type characteristics based on activation energy distributions derived from Tmax-HI pair relationship, which suggest variance of the preserved algal materials for Upper and Lower Bakken. The modeling results by the thermal history analysis with the Rock-Eval dataset indicate a higher remanent generable kerogen in Lower Bakken shale, and the thermal maturity results will be valuable for integrated assessment of the hydrocarbon systems of Williston Basin accurately.

中文翻译：

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提取干酪根热图信息研究 Williston 上下巴肯页岩有机质变化

摘要 干酪根动力学研究的活化能分布包含了地质时间尺度上主烃源岩热历史的一些整体特征。从热图中提取相关信息对于重建烃源岩成熟和油气生成历史至关重要。在这项研究中，为了提高对 Bakken 页岩烃源岩的认识，我们通过反演 Williston 盆地 Bakken 组的 Rock-Eval 热图，提出了一个新的定量动力学模型。收集了来自 Bakken 组上段和下段的一组岩心样品，用于估算转化率 (TR) 和热解分析，并利用烃源岩Tmax-Hydrogen Index协变结合不同埋藏史设计并实施了不同动力学统计参数的反演方法。对加拿大和美国两侧 Williston 盆地样品的 Rock-Eval 结果分析证明了上巴肯和下巴肯的全盆地有机质特征，并确定了碳氢化合物生成历史的变化。根据 Tmax-HI 对关系得出的活化能分布，上巴肯页岩和下巴肯页岩具有不同的干酪根类型特征，这表明上巴肯页岩和下巴肯页岩保存的藻类物质存在差异。Rock-Eval 数据集的热历史分析的建模结果表明下巴肯页岩具有较高的剩余可产干酪根，