河套盆地呼和坳陷浅层生物气气源条件分析

An analysis on source conditions of shallow biogas reservoirs in Huhe depression, Hetao basin

通过对呼和坳陷第四系及新近系上新统的沉积相、产气状况及气源条件研究,证实了生物气的存在,认为河套盆地呼和坳陷第四系具有浅层生物气形成的基本地质条件,气源岩厚度大,有机碳含量为0.49%,有机质类型以混合型、腐殖型为主,少量腐泥型,有机质未成熟,目前正处于生物化学生气阶段。同时,还探讨了影响生烃能力的环境因素,认为呼和坳陷地球化学环境良好,具有生物气富集成藏的物质基础和较大规模的生气能力。

Studies on the sedimentary facies, gas production status and gas source conditions of the Quaternary and Neogen Pliocene in the Huhe depression, the Hetao basin, show that biogas pools exist in the study area. The Quaternary in the study area have the basic conditions for the pooling of shallow biogas. The source rock is large in thickness and has an organic carbon content of 0.49%. Its kerogens are dominated by type-Ⅱand Ⅲ, with minor type-Ⅰ, and currently are in the immature stage of generating biogenic and chemogenic gas. The environmental factors that influence hydrocarbon-generating potential are also discussed. It is believed that the Huhe depression has a favorable geochemical environment, the necessary material base for biogas generation and accumulation and relatively large biogas-generating potential.