The Devonian Antrim Shale is an unconventional biogenic gas accumulation with a technical recoverable resource of 19.9 Tcf. However, major knowledge gaps remain regarding understanding of the source rock potential, organic facies assemblages and paleo-depositional conditions of the Antrim Shale members. This work utilized Rock-Eval pyrolysis, reflected light microscopy and solid bitumen reflectance to characterize the source rock quality, organo-facies assemblages, and thermal maturity of the various Antrim Shale members at three different localities in the Michigan Basin. Results showed that the Lachine and Norwood members are richer in organic matter (up to 24 wt%) than the Upper and Paxton members (<8 wt%). Organic matter is mainly dominated by marine Type II kerogen in the black shales of the Lachine and Norwood members, and by Type II and Type II/III in the Paxton Member. Telalginite, which is represented mainly by Tasmanites and Leiosphaeridia cysts, is the dominant organic matter in the black shale members where they account for about two-thirds of the organic matter composition. Solid bitumen, which accounts for less than one-third of the organic matter composition, is second after alginite. Both alginite and solid bitumen populations decline in abundance progressively in the Upper and Paxton members at the expense of inertinite and vitrinite. The dominant organofacies groups in the studied Antrim Shale members can be assigned to the BP type B and type D/E. Organic matter maturity determined from Rock-Eval T_max and bitumen reflectance varies from immature to marginally mature across the Michigan Basin. The results confirmed that sediment burial depth and lateral position in the basin controlled organic facies assemblages within the Antrim Shale members.

泥盆纪安特里姆页岩是一个非常规生物气藏，技术可采资源量为 19.9 Tcf。然而，在对安特里姆页岩段的烃源岩潜力、有机相组合和古沉积条件的理解方面仍然存在重大的知识空白。这项工作利用 Rock-Eval 热解、反射光显微镜和固体沥青反射来表征密歇根盆地三个不同地点的各种 Antrim 页岩成员的烃源岩质量、有机相组合和热成熟度。结果表明，Lachine 和Norwood 成员比Upper 和Paxton 成员（<8 wt%）富含有机质（高达24 wt%）。Lachine 和 Norwood 段黑色页岩有机质主要以海相Ⅱ型干酪根为主，和 Paxton 成员中的 II 型和 II/III 型。Telalginite，主要由Tasmanites和Leiosphaeridia包囊是黑色页岩成员中的主要有机质，它们约占有机质组成的三分之二。固体沥青占有机物成分的不到三分之一，仅次于海藻石。在上层和帕克斯顿成员中，海藻岩和固体沥青的数量逐渐减少，以牺牲惰性和镜质体为代价。所研究的安特里姆页岩成员中的优势有机相组可以归为 B 型和 D/E 型 BP。由 Rock-Eval T _max确定的有机质成熟度整个密歇根盆地的沥青反射率从不成熟到略成熟不等。结果证实盆地沉积物埋藏深度和横向位置控制了安特里姆页岩段内的有机相组合。