Abstract Shale-hosted hydrocarbons is regarded as an important unconventional resource around the world. So far, huge emphasis has been put on the contribution of organic pores to self-source and self-reservoir hydrocarbon systems. This study systemically reveals the contribution of organic pores to hydrocarbon potential in the Duvernay Shale through restoring thermal maturity evolution, modeling hydrocarbon generation and expulsion in the Duvernay Formation, analyzing absorption capacity variation with TOC and modeled pore pressure, determining free-gas storage capacity with calculated organic porosity and correction of adsorbed gas, and calculating in-place shale oil and gas volumes with volumetric method. The Duvernay Shale reached “oil window” and “gas window” about 70–80 Ma and 50 Ma ago, respectively. Significant hydrocarbon generation (20% TR) began and terminated (95% TR) at Ro of 0.65% and 1.85%, respectively. Gas generation rates increased dramatically from Ro of 1.1%, while the instantaneous HC1-4 expulsion reached peak at Ro of 1.66%, the difference between which indicates considerable retained gas resource in Duvernay Shale. The gas storage capacity, including absorption capacity and free gas capacity, varies significantly in the Duvernay Shale, specifically, the former rangs from 8 to 30scf/ton, and the latter from 40 to 140scf/ton. The estimated median value of total in-place natural gas (GIP) and in-place oil resource (OIP) in organic pores of Duvernay shale are 404.8 TCF and 81420 MMbbl, respectively. Thus, the organic porosity is one of the keys to make the Duvernay Shale a successful play.

中文翻译：

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基于石油系统建模的加拿大西部沉积盆地泥盆系Duvernay页岩有机孔隙中的页岩油气资源

摘要 页岩赋存的油气在世界范围内被视为一种重要的非常规资源。迄今为止，有机孔隙对自生自储油气系统的贡献一直受到高度重视。本研究通过恢复热成熟度演化、模拟 Duvernay 组的生烃和排烃、分析吸收能力随 TOC 和模拟孔隙压力的变化、确定游离气存储能力，系统地揭示了有机孔隙对 Duvernay 页岩油气潜力的贡献。计算有机孔隙度并修正吸附气，用体积法计算就地页岩油气体积。Duvernay 页岩分别在 70~80 Ma 和 50 Ma 前分别达到“油窗”和“气窗”。在 Ro 分别为 0.65% 和 1.85% 时，显着的碳氢化合物生成 (20% TR) 开始和终止 (95% TR)。气体生成率从 1.1% 的 Ro 急剧增加，而瞬时 HC1-4 排出在 Ro 达到 1.66% 的峰值，两者之间的差异表明 Duvernay 页岩中具有相当多的保留天然气资源。Duvernay 页岩的储气量，包括吸收量和游离气量，差异较大，前者为 8～30scf/ton，后者为 40～140scf/ton。Duvernay 页岩有机孔隙中总天然气（GIP）和石油资源（OIP）的估计中值分别为 404.8 TCF 和 81420 MMbbl。因此，有机孔隙度是使 Duvernay 页岩成功开采的关键之一。